基于CPTU的土体不排水抗剪强度研究

Study on Undrained Shear Strel ngth of Soils Based on CPTU

文中采用孔压静力触探(CPTU)探头对某地区黏土进行了不排水抗剪贯入模型试验,并采用CEL大变形数值模拟方法模拟CPTU探头在土体的贯入过程中造成不同深度土层的变形过程。分析模型试验结果和数值模拟结果发现,在贯入试验中,当土体距离CPTU探头较远时,土体的水平位移较小,影响范围约为3B,CPTU探头贯入深度相同的情况下,在CPTU探头下1B的深度,土体会产生最大的形变;在CPTU探头贯入过程中,数值模型在CPTU探头贯入的初期和后期出现了两种不同的破坏模式。采用文中建立的方法对文中模型试验进行计算发现,文中模型试验为第一种破坏模式。

This article uses the CPTU probe to conduct undrained shear penetration model tests on clay in a certain area,and uses the CEL large deformation numerical simulation method to simulate the deformation process of soil layers at different depths caused by the penetration of the CPTU probe into the soil.Through analysis of the model test results and numerical simulation results,it was found that during the penetration test,when the soil is far from the CPTU probe,the horizontal displacement of the soil is small,and the affected range is about 3B.At the same depth of penetration of the CPTU probe,at a depth of 1Bbelow the CPTU probe,the soil will produce the largest deformation;during the penetration process of the CPTU probe,two different failure modes appeared in the numerical model in the early and late stages of CPTU probe penetration;using the method established in this article to calculate this articles model test found that this articles model test is the first failure mode.