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Effect of electro-osmotic treatment on piles

机译：电渗处理对桩的影响

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The electro-osmotic treatment technique may be used to increase the strength of the soil and load-carrying capacity of a foundation and reduce the potential for foundation settlement. In this study, electro-osmotic treatment was employed to increase the axial and lateral capacity of piles installed in a soft sensitive clay in a laboratory experimental programme. The experimental work involved two phases. First, a small-scale (bench size) set-up was constructed and used to investigate the effects of electrical treatment on the capacity of model piles. The results obtained from the small-scale investigation were then used in the planning and execution of the second phase of the study, which involved a large-scale testing programme. Three cells filled with soft sensitive clay were used in the small-scale testing programme. The soil in two cells was treated, one with constant direct current and the second with intermittent current, and the third was not treated and was used as the control. The results obtained from the small-scale tests showed that the pullout capacity of the piles in the treatment cells decreased but their lateral capacity increased, compared with the control pile. The reduction in pullout capacity was attributed to overtreat-ment of the soil in the vicinity of the pile, causing soil shrinkage and separation at the pile-soil interface. The overtreatment was probably due to excessive treatment effort manifested in a high voltage gradient and a long treatment time. The soil shrinkage did not affect the lateral capacity, which had actually increased by 36% over that of the control. The applied electric potential and the treatment duration were reduced in the large-scale testing programme. The results obtained from the axial load tests showed that the treatment had increased the capacity of the piles above that of the control piles by up to 45%.
机译：可以使用电渗处理技术来增加土壤的强度和地基的承载能力，并减少地基沉降的可能性。在这项研究中，在实验室实验程序中，采用电渗处理来增加安装在软敏感粘土中的桩的轴向和侧向承载力。实验工作包括两个阶段。首先，建立了一个小规模（工作台尺寸）的装置，并用来研究电处理对模型桩承载力的影响。然后，将从小型调查获得的结果用于计划和执行研究的第二阶段，该阶段涉及大规模的测试程序。在小型测试程序中使用了三个装有软敏感粘土的单元。处理了两个单元中的土壤，一个单元使用恒定直流电，第二个单元使用断续电流，第三个单元未经处理，用作对照。从小规模试验获得的结果表明，与对照桩相比，处理单元中桩的拔出能力有所下降，但其侧向承载能力却有所提高。拔除能力的下降归因于桩附近土壤的过度处理，从而导致土壤收缩和桩-土界面处的分离。过度治疗可能是由于过高的治疗努力所致，表现为高电压梯度和较长的治疗时间。土壤收缩并不影响侧向承载力，侧向承载力实际上比对照增加了36％。大规模测试程序减少了施加的电势和治疗时间。从轴向载荷试验获得的结果表明，该处理使桩的承载能力比控制桩提高了多达45％。

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