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电解减饱和法是近年来提出的一种处理可液化地基的新方法,通过电解饱和地基中的孔隙水生成气体,达到减小地基饱和度并提高抗液化强度的目的。采用石墨毡为电极,开展恒定电流强度下的现场电解减饱和试验研究。通过地基压缩波速试验测得电解作用下地基深部的饱和度从98.2%减小至94%。着重分析了地基土在电解过程中的电学特性,试验结果表明:等效电阻随着饱和度的减小而逐渐增大,呈现出较好的单值函数关系;随着电流强度的增大,等效电阻的增长速率越高,其电阻增幅也越快,达到最大等效电阻所消耗的电量先逐渐增大,然后再趋于平缓;虽然增大电流强度会略微增加耗电量,但是可以显著提高电解减饱和法效率。此外,等效电阻的衰减过程可以分为快速衰减、平缓衰减和稳定3个阶段,其中快速衰减阶段为停止电解3 h内,等效电阻的平均衰减速率为11Ω/h;由于试验场地位于河边,电解产生的气泡易受渗流的影响,使其难以长期维持在正负极间土层中;然而在该阶段,其电阻降幅也仅有15%,使可液化地基仍维持着较好的抗液化能力。对地基二次或多次电解,可以大幅节省耗电量,约为首次电解的30%;而且还能加快地基正负极间土层中气泡的生成量,从而有效减小饱和度,提高电解减饱和法效率以及地基的抗液化能力。
Electrolysis desaturation method is proposed in recent years, a new method of liquefiable ground, electrolysis of saturated porous media to generate gas, to reduce the saturation of the foundation and improve the anti-liquefaction strength purposes. Using graphite felt as electrode, carry out on-site electrolytic desaturation test under constant current intensity. The saturation of the deep foundation under electrolysis was reduced from 98.2% to 94% by the compression test of foundation. The results show that the equivalent resistance increases with the decrease of the saturation, showing a better single-valued function. With the increase of the current intensity, The higher the rate of increase of the equivalent resistance, the faster the resistance increases, and the amount of electricity consumed to reach the maximum equivalent resistance first increases gradually and then tends to be gentle. Although increasing the current intensity slightly increases the power consumption, Significantly improve the efficiency of electrolytic desaturation. In addition, the decay process of the equivalent resistance can be divided into three stages: rapid decay, gentle decay and stabilization. In the fast decay stage, the decay rate of the equivalent resistance is 11Ω / h within 3 h of stopping the electrolysis. Since the test site is located in the river The bubbles generated by the electrolysis were easily affected by the seepage, making it difficult to maintain the bubbles in the soil between the positive and negative electrodes for a long period of time. However, the resistance drop was only 15% at this stage, so the liquefiable foundation still maintained good Anti-liquefaction ability. Second or more times on the foundation electrolysis, can greatly save power consumption, about 30% for the first electrolysis; but also to speed up the formation of bubbles in the soil between the positive and negative base formation, thereby effectively reducing the saturation and improve the electrolysis Desaturation efficiency and liquefaction resistance of foundation.