电渗联合堆载预压及化学法加速淤筑土固结的试验研究

Experimental Study on Accelerated Consolidation of Silty Clay by Combined Electro-Osmotic both Pre-Loading and Chemical Method of Mound Load

【目的】电渗法是通过在土体中施加低压直流电来加速排水固结的处理方法。在电场中,液体在外加电场的影响下通过膜的运动称为电渗。【方法】鉴于电渗法的特点,它通常联合堆载预压法、真空预压法和化学法共同使用来治理软黏土,本研究对黄河范县段的淤筑土采用单独电渗法、电渗联合堆载预压法、电渗联合化学法的比较试验,通过累积排水量、含水率、抗剪强度、能耗等结果来对比三种方法的效果。【结果】与未施加电渗法的三组对照试验相比,电渗试验无论是排水速率还是累计排水量相比于传统单一的方法都有了明显的提升,电渗联合堆载预压法处理后土样的强度最高。【结论】在各种方法当中电渗联合堆载预压法的提升效果最为明显。

[Purposes]Electroosmosis is a treatment method to accelerate drainage consolidation by apply⁃ing low-voltage direct current in the soil.In the electric field,the movement of liquid through the mem⁃brane under the influence of the applied electric field is called electroosmosis.[Methods]In view of the characteristics of electro-osmosis,it is usually used in combination with stack pre-pressure method,vacuum pre-pressure method and chemical method to treat soft clay soil.In this study,comparative tests of electro-osmosis alone,electro-osmosis combined with stack pre-pressure method and electroosmosis combined with chemical method were conducted on the siltation soil of Fanxian section of Yel⁃low River to compare the effects of the three methods by the results of cumulative drainage,water con⁃tent,shear strength and energy consumption.[Findings]Compared with the three control tests without the electro-osmosis method,the drainage rate and cumulative displacement of the electro-osmotic test are significantly improved compared with the traditional single method,and the strength of the soil samples treated by the combined electro-osmotic preloading method is the highest.[Conclusions]Among all kinds of methods,electro-osmotic combined preloading method has the most obvious lifting effect.