Ground improvement techniques seminar report, ppt, pdf for. Direct current electricity is applied from anodes steel. A number of chemical, physical and mechanical interactions occur during the improvement. This method should be used for exceptional cases when other methods cannot be used. Overview of preloading methods for soil improvement abstract. Improvement of clay soil by electroosmosis technique request pdf. Here you can download the free lecture notes of ground improvement techniques pdf notes git notes pdf materials with multiple file linksthe ground improvement techniques notes pdf git pdf notes. Here we have listed different units wise downloadable links of ground improvement techniques notes where you can click to download respectively. Electroosmotic pulse eop technology for control of. Oct 02, 2019 git pdf notes here you can get future notes of ground improvement techniques pdf notes with unit wise topics.
Electro osmosis geosynthetic reinforced construction platforms fill delay period with or without surcharge geotextile encased columns. The twodimensional consolidation theory of electro osmosis j. Ground improvement methods should be referred to for specific geotechnical data needed for various types of ground improvement techniques. The electro osmotic treatment for stabilizing finegrained soils is gaining importance in the field of geotechnical engineering. Also explore the seminar topics paper on ground improvement techniques with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015. Ground improvement techniques for stabilization of soil for various purposes the ground can be improved by adapting certain ground improvement techniques. In this paper a theoretical model is proposed for electro osmotic consolidation by coupling the seepage field. An optimal anode length of twothirds of the soil depth was recommended according to the experimental results. Laboratory tests on soft ground improvement by chemical electro osmosis method.
The ground can be improved by adapting certain ground improvement techniques. Consolidation of peat and organic soil using electro. Influence of dynamic loading activation time on electro. The principles of electro osmosis were introduced as early as the 1930s by casagrande hausmann, 1990 and have been utilized as a method of soil stabilization for a number of different types of projects and applications since that time. Electro osmotic systems and prefabricated drains are applied to waterbearing finegrained soils where gravitational movement of ground water through porous rrdia is diffi cult and additional force is required to move the water. The average undrained shear strength of the soil treated with electro osmosis for 4 days after injection of cacl2 and combination of cacl2 and na2sio2n solution was 2. Electro osmotic treatment electro osmosis displace water through porous space chemical injection localisedimprovement effects somechemicalsaretoxic and hazardous electrolyte leaching electrode decomposition experimentonmarineclay, 2006 tremendous costs associated in metal electrodes consumed. Also method of use and drainage by electro osmotic method. Nov 16, 2016 electro osmosis refers to the movement of liquid in a porous material due to an applied electric field. Soil improvement is the alteration of any property of a soil to improve its engineering performance. However, the significant potential loss caused by the cracking of the soil near the electrode in the later stages of electro osmosis hinders further improvement of its efficiency. Soil improvement in finegrained soils involves techniques that are.
The level of the water table fluctuates with season. Lo 5 proved that electroosmosis can permanently reduce the brittleness index and sensitivity of soil, improve soil quality, and obtain. When the application of traditional ground improvement techniques, such a. Successful field trials have been carried out in clay, with limited research in peat and organic soil. Ground improvement techniques pdf notes git notes pdf. Pdf electroosmosis is an established method of dewatering fine soils.
Electro osmosis is a suitable method for the consolidation of soft soil. As shown in figure 1, for ground improvement purposes the. Experimental study of the electroosmosis consolidation of soft clay under anode followup. Electro pulse technologies, of greenwich, ct, administers the licensing of the patented eop. Influence of electroosmosis activation time on vacuum. Consolidation of peat and organic soil using electroosmosis.
Based on electrode alignments, the application of electro osmosis consolidation can be categorised into two general cases. Written by an author with more than 25 years of field and academic experience, soil improvement and ground modification methods explains ground improvement technologies for converting marginal soil into soil that will support all types of structures. If the water table lies very close to the base of footings, the bearing capacity and settlement characteristics of the soil would be affected. Electro osmotic consolidation studies on peat of north sarawak shenbaga r. Electro osmosis is important for many geotechnical applications, such as improving friction pile capac. Geotech tools includes 46 ground improvement and geoconstruction technologies and pro. These results indicate that eop technology can be effective on concretes with wc ratios between 0. Ground improvement by preloading and drainage prepared by. A new type of electrical prefabricated vertical drain epvd and a new electroosmotic drainage system are suggested to allow the application of the new method.
Huong curtin university of technology, miri, sarawak, malaysia. Wang analysing drivers stop and go decisions in dilemma zones at signalised intersections. A small positive charge repels free moisture molecules from. Nicholson, in soil improvement and ground modification methods, 2015.
School of civil engineering, henan polytechnic university, jiaozuo 454000, china. An alternative method, however, is the use of electro osmosis. Proceedings of the institution of civil engineers ground. The objective of this course is for students to understand common ground improvement methods, including densification and compaction, preloading consolidation by prefabricated vertical drains, vacuum and electro osmotic consolidation, physical and chemical stabilization, soil reinforcement and seepage and dewatering. Vacuum preloading electro osmosis is one of the most useful ground improvement methods for soft soil but is not widely used in practical engineering because of its high power consumption and poor electro osmotic efficiency in the later stages. Dynamic loading is applied to overcome this problem. Abstract the electroosmotic consolidation is a method to improve geotechnical. Pdf ground improvement techniques pdf notes git notes. A number of chemical, physical and mechanical interactions occur during the improvement of soil by this technique. Strange that a cure, for something that barely exists, if at all. Electro osmotic consolidation is an attractive, soft ground improvement technique. First reported by reuss in 1809, the electroosmosis effect in. Key laboratory of geomechanics and embankment engineering, hohai university, ministry of education, nanjing 210098, china.
The application of electro osmosis eo for stabilizing soft clays is receiving more attention in geotechnical engineering. Ground improvement techniques for stabilization of subgrade soils. Experimental study on soft soils improvement by the deep electro osmotic consolidation technique. In the case of using electroosmosis, that force is. Soil improvement by electroosmosis with vacuum drainage in. Analytical solution for onedimensional vertical electro. Below ground masonry and concrete structures, such as basements, can sustain structural damage from chronic water seepage through floors and walls. Nerve axons were tested within 40 minutes of their removal from the living animal and the results closely approach measurements in the living state. Ground improvement techniques seminar report, ppt, pdf.
In addition, the intermittent current technique could also improve the drainage effect of soil submitted to electro osmotic consolidation, and the combination of the two techniques has potential application in soft soil improvement. Also explore the seminar topics paper on ground improvement techniques with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. Vibrocompaction increases the density of the soil by using powerful depth. Electroosmosis refers to the movement of liquid in a porous material due to an applied electric field. Laboratory tests on soft ground improvement by chemical. There is absolute evidence that during the electro osmotic treatment, the basic index, physicochemical and engineering properties of the soils was found to be modified. The electroosmosis chemical treatment ect is a useful method for improving soil strength. Electro osmosis is a very effective instrument when treating heterogeneous, silt and clayrich soil. Proceedings of the institution of civil engineers ground improvement, volume 6, issue 4, 1 jan 2002 145152 experimental study on the combined application of vacuum preloading variablespacing electro osmosis to soft ground improvement. Since then, electroosmosis has been successfully used for soft ground improvement, slope stabilisation, dewatering of tailings and sludge, pile foundation and soil remediation 212.
Electro osmosis damp proofing systems utter and complete fraud electro osmosis is scientific theory that is being pushed by various manufacturers as a cure for rising damp. Electro osmosis in the axons of freshly killed squids has been studied 285. Institute of technology, savli on september 15, friday,2017 ground improvement technology. Subsidence of adjacent ground and sloughing of the lower part of a slope sloped pits may occur. A wide variety of ground improvement methods have been developed for economic foundation solutions on soft soils for a stateoftheart, see 15 and cited references. Pdf mathematical model of electroosmotic consolidation for. The use of electro osmosis for treatment of soft clay soils is a common ground improvement technique. Experimental study on the combined application of vacuum preloading variablespacing electroosmosis to soft ground improvement h. Laboratory assessment of electroosmotic stabilization of.
The phenomenon of electro osmosis is very useful in chemical separation techniques and buffered solutions. As a rapid and effective ground improvement method is urgently required for the booming land reclamation in chinas coastal area, this study proposes a new combined method of electroosmosis, vacuum preloading and surcharge preloading. Ren lianwei 1, xiao yang 1, kong gangqiang 2, zhang minxia 1. Pdf mathematical model of electroosmotic consolidation. In this study, electro osmotic consolidation at a certain depth was proposed to improve the drainage and consolidation effect.
A new method of combination of electroosmosis, vacuum and. Improvement of clay soil by electroosmosis technique. Missouri university of science and technology scholars mine. The sump should be preferably lined with a filter material which has. Ground improvement methods, reference manual volume i and ii, fhwa hni. The phenomenon of electroosmosis is very useful in chemical separation techniques and buffered solutions. The quality of electroosmotic improvement was enhanced by longer processing time and increased potential gradient. Enhanced engineering characteristics of soils by electro. Combining vacuum preloading with electro osmosis of a dredged slurry is a significantly effective technology for ground improvement. Experimental study of the electroosmosis consolidation of. Experimental study on soft soils improvement by the deep.
Electroosmotic pulse technology engineer research and. With a view to expanding great yarmouths port operational capabilities, the outer harbour will service a whole range of ships including freight ferries and container. Explore ground improvement techniques with free download of seminar report and ppt in pdf and doc format. Electroosmotic consolidation of soil the constructor.
Electro kinetic process thermo osmosis electro osmosis prediction of engineering behaviour of soils using index properties empirical equations and their applicability. The dynamic loading activation time is considered to strongly influence the performance of. Ground improvement techniques for stabilization of. Request pdf improvement of clay soil by electroosmosis technique the use of electroosmosis for treatment of soft clay soils is a common ground. Commonly applied in soil decontamination, electroosmosis is also being developed as a ground improvement technique. Attach a negative terminal of dc voltage at each well and the positive terminal on each grounding rod. Ground improvement techniques for stabilization of different. Analytical solution for axisymmetric electroosmotic. The use of electroosmosis for treatment of soft clay soils is a common ground improvement technique. However, the improvement was limited by the drying of the anode area. The twodimensional consolidation theory of electroosmosis. Ground improvement at great yarmouth, uk the outer harbour, great yarmouth, is currently under construction a project undertaken by a van oordbam nuttall joint venture. Electro osmosis damp proofing systems are a proven scientific method of treating rising damp in walls.
Sep 16, 2017 ground improvement techniques introduction 1. Despite extensive research, the mechanism of vacuum preloading combined with electro osmosis is still not properly understood, especially regarding the optimum electro osmosis activation time. Aug 25, 2018 download version download 3070 file size 4. Keywords cl, soil improvement, electro osmosis, saline solution, undrained shear strength, ph.
The dynamic loading activation time is considered to strongly influence the performance. Overview of preloading methods for soil improvement. As shown in figure 1, for ground improvement purposes the electrodes are usually laid in vertical alignment. Numerical simulation of elastoplastic electroosmosis. Electroosmosis is a very effective instrument when treating heterogeneous, silt and clayrich soil. Soil improvement and ground modification methods 1st edition. Electro osmotic consolidation of soil electro osmotic consolidation, which was studied and applied by casagrande for the first time, is an attractive soil improvement technique for soft clay. Used in low permeability soils silts, silty clays, some peats when no other method is suitable. Electroosmosis was discovered independently in 1814 by the english chemist robert porrett jr. In the case of using electro osmosis, that force is.
Electro osmosis makes water flow through fine grained soils. Electro osmotic consolidation is an effective method for soft ground improvement. Seminar announcement electroosmotic consolidation of peat. Electroosmotic flow is caused by the coulomb force induced by an electric field on net mobile electric charge in a solution.
Electroosmotic treatment electroosmosis displace water through porous space chemical injection localisedimprovement effects somechemicalsaretoxic and hazardous electrolyte leaching electrode decomposition experimentonmarineclay, 2006 tremendous costs associated in metal electrodes consumed. Git complete chapter pdf notes download zone smartzworld. Feb 22, 2016 this feature is not available right now. Electro osmotic consolidation has long been studied as a soft soil improvement technique. The achievements and major bottleneck of the current technique were briefly. Experimental study on the combined application of vacuum. Electro osmosis is a well known technique for the stabilization of soft fine grained soils.
In this technique, the saturated fine grain soil is consolidated by the application of electric current. When the electro osmotic consolidation is used alone for the soil improvement and there is no water at the top of the model that can enter the model, the top boundary is actually a 0 ux boundary, which can be described by a onedimensional axisymmetric model. Soil improvement, rapid embankment construction, and stabilization of the pavement working platform. Though electro osmosis has been proven to be a viable method for improvement of clay, limited studies have been carried out on the electro osmosis of peat. Ground improvement categories, functions, methods, and applications are summarized in table 2. Vibrocompaction increases the density of the soil by using powerful depth vibrators. Proceedings of the institution of civil engineers ground improvement, volume 6, issue 4, 1 jan 2002 145152 experimental study on the combined application of vacuum preloading variablespacing electroosmosis to soft ground improvement. Electro osmotic consolidation is an effective ground improvement technique in fine grained soils. Electro osmosis is one of the several electrokinetic reactions that take place when a direct current voltage is applied across the electrodes inserted into a saturated soil.
Sf8202 dynamics of soils and foundations 3 0 0 3 3. Electro osmosis method requires specialized equipment and high electricity consumption. Pdf electroosmosis treatment techniques and their effect on. Slurry improvement by vacuum preloading and electro.
However, problems such as electrode erosion, low e. Usually space wells at intervals of about 35 ft then drive grounding rods between the wells. A novel technique, called anode followup for electro osmotic consolidation of soft clay, is proposed. When the application of traditional ground improvement techniques, such as surcharge, preloading, wick drains, and vacuum preloading, is not appropriate for a particular situation, innovative techniques such as electro osmosis need to be considered. The results demonstrated that the electro osmosis process could significantly enhance reduction of the soil water content resulting in increased soil shear strength. Electroosmosis is an electrokinetic phenomenon where water is moved through soil under the influence of an electrical field. Electroosmotic consolidation provides an attractive soil improvement technique, during which flow of pore water occurs from the anode toward the cathode under.