间歇式真空预压联合电渗加固吹填软土试验

发布时间：2019-07-27 10:02

【摘要】：针对温州软土黏粒含量高、压缩性大、抗剪强度低的特点,提出间歇式真空预压联合电渗的新思路,介绍了该方法的基本原理。采用自制玻璃模型桶,通过室内模型试验对吹填软土加固过程中的出流量、真空度、电流、温度以及试验后土体的抗剪强度、含水率、黏粒含量等进行监测。试验结果表明:单独进行真空预压处理时,后期效果不理想且耗能较多,采用以电渗为主的真空预压联合停泵电渗方法更为高效;间歇通电方式可以降低试验末期电流的衰减速率,保证了电渗阶段的排水效率不致下降过大;应尽量减小电渗阴极和排水板之间的间隙,该间隙过大易造成土体处理的不均匀性;处理后的土体黏粒含量明显下降,这有利于降低土体流变性、增强稳定性。
[Abstract]:In view of the characteristics of high clay content, high compressibility and low shear strength of Wenzhou soft soil, a new idea of intermittent vacuum preloading combined electroosmosis is put forward, and the basic principle of this method is introduced. The flow rate, vacuum degree, current, temperature, shear strength, moisture content and clay content of the soft soil strengthened by blowing filling were monitored by indoor model test with self-made glass model bucket, which was used to monitor the flow rate, vacuum degree, current, temperature and shear strength, moisture content and clay content of the soil after the test. The test results show that when vacuum preloading is carried out alone, the later stage effect is not ideal and the energy consumption is more, and the vacuum preloading combined with pump stoppage method based on electroosmosis is more efficient, and the intermittent electrification mode can reduce the attenuation rate of the current at the end of the test and ensure that the drainage efficiency in the electroosmosis stage does not decrease too much. The gap between the electroosmotic cathode and the drainage plate should be reduced as much as possible, which is too large to cause the inhomogeneity of the soil treatment, and the clay content of the treated soil decreases obviously, which is beneficial to reduce the Rheological properties of the soil and enhance the stability.
【作者单位】：温州大学建筑与土木工程学院;温州大学浙江省软弱土地基与海涂围垦工程技术重点实验室;上海大学土木工程系;
【基金】：国家自然科学基金项目(51278383,51478255,51408440,51478364,51622810) 国家国际科技合作专项项目(2015DFA71550) 国家重点基础研究发展计划(“九七三”计划)项目(2016YFC0800201) 浙江省自然科学基金项目(LY17E080010) 温州市科技项目(S20150015) 上海市自然科学基金项目(14ZR1416100)
【分类号】：U416.1

【相似文献】