基于CPTU的土-膨润土隔离墙墙体材料抗剪强度评估方法

发布时间：2018-04-11 23:39

本文选题：土-膨润土 + 隔离墙　；参考：《东南大学学报(自然科学版)》2016年S1期

【摘要】：针对传统基于CPTU测试计算土体不排水抗剪强度su的方法在土-膨润土竖向隔离墙中难以适用,以及圆锥系数的取值存在较大经验性的问题,通过引入圆锥系数Nke与孔压参数比Bq的关系,以及三轴试验中不排水抗剪强度su与有效固结压力p'的比值,提出了改进的计算方法,并且通过对文献案例的计算比较验证了该方法的可靠性.通过对国内首个土-膨润土隔离墙试验段的现场CPTU测试,采用该方法计算不排水抗剪强度su,得到了墙体中su随深度的分布规律,即su随深度增长到一定程度后便不再继续增加,甚至会随深度增长而略有减小;通过比较工后8个月和15个月的测试结果,发现整个墙体深度范围内的不排水抗剪强度随时间推移而增长,但总体上仍较小.
[Abstract]:The traditional method of calculating undrained shear strength su based on CPTU test is difficult to be applied to the vertical wall of soil-bentonite, and there are some problems in the calculation of cone coefficient.By introducing the relation between cone coefficient Nke and pore pressure parameter ratio BQ, and the ratio of undrained shear strength su to effective consolidation pressure p' in triaxial test, an improved calculation method is proposed.The reliability of the method is verified by the comparison of literature cases.Based on the field CPTU test of the first soil-bentonite wall section in China, this method is used to calculate the undrained shear strength, and the distribution of su with depth in the wall is obtained, that is, the su will not continue to increase when the depth increases to a certain extent.By comparing the test results of 8 months and 15 months, it is found that the undrained shear strength in the whole wall depth range increases with time, but it is still relatively small.
【作者单位】：浙江大学软弱土与环境土工教育部重点实验室;浙江大学岩土工程研究所;东南大学岩土工程研究所;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA062601)
【分类号】：TU432;X505

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