软土抗剪强度指标随固结度变化规律分析

›› 2014, Vol. 35 ›› Issue (S1): 106-112.

软土抗剪强度指标随固结度变化规律分析

汪洪星¹，杨春和^{1, 2}，陈锋¹，冒海军¹

1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071； 2. 重庆大学西南资源开发及环境灾害控制工程教育部重点实验室，重庆 400044

收稿日期:2013-10-11 出版日期:2014-06-10 发布日期:2014-06-20
作者简介:汪洪星，男，1983年生，博士研究生，从事尾矿坝及散体材料的稳定性研究工作
基金资助:
国家重点基础研究发展规划(973)资助（No.2010CB226701）。

Analysis of changing rule of shear strength indexes of soft soil with consolidation degree

WANG Hong-xing¹，YANG Chun-he^{1, 2}，CHEN Feng¹，MAO Hai-jun¹

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2 .Key Laboratory for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China

Received:2013-10-11 Online:2014-06-10 Published:2014-06-20

摘要/Abstract

摘要： 常规的抗剪强度指标黏聚力c和内摩擦角φ无法准确描述堆载作用下任意固结度时软土的力学特性，而现有的考虑软土抗剪强度值随固结度增长的极限平衡法无法得出应力场、位移场等实际工程需要的数据，因此，基于理论推导和室内试验，对堆载作用下软土抗剪强度指标随固结度的变化规律进行了分析。对现有的2个计算公式进行了对比分析，得出它们具有等价性。从孔隙水压力的角度进行分析，提出了新的计算公式，并且得出内摩擦角随固结度单调递增，黏聚力随固结度单调递减的变化规律。当固结度一定且不为100%时，黏聚力与初始固结压力呈线性增长的关系，内摩擦角与其无关。室内试验表明，由于综合考虑了有效应力参数和总应力参数，新推导公式与试验结果吻合得更好，证明了新推导公式正确性和优越性。

关键词: 抗剪强度指标, 固结度, 孔隙水压力, 变化规律

Abstract: The analysis of changing rule of shear strength indexes of soft soil with consolidation degree under the effect of surcharge load is executed based on the theoretical derivation and indoor tests; since the conventional shear strength indexes cohesion value and internal friction angle cannot represent the mechanical character of the soft soil at any consolidation degree at the effect of the surcharge load accurately, and the existed limit equilibrium method considering the increasing of the shear strength value with the consolidation degree cannot get the data such as stress field, displacement field that are needed by the practical engineering. The comparison analysis has been done for two existed formulae, and deduced that they have equivalence property. From the viewpoint of pore water pressure, a new formula is presented; and from which we get: the internal friction angle at any consolidation degree increases with the consolidation degree monotonously; and the cohesion value decreases with the consolidation degree monotonously; when the consolidation degree is fixed and is not 100%, the cohesion value presents the linear increasing relationship with the initial consolidation pressure; but the value of the internal friction angle is not related to it. The indoor test shows that, the newly deduced formula results fit better with the test results than the existed formulae results; since the total stress parameters and the effective stress parameters have been considered comprehensively, so as to prove the validity and advantage of the newly deduced formula.

Key words: shear strength indexes, consolidation degree, pore water pressure, changing rule

中图分类号:

TU443

汪洪星，杨春和，陈锋，冒海军,. 软土抗剪强度指标随固结度变化规律分析[J]. , 2014, 35(S1): 106-112.

WANG Hong-xing ，YANG Chun-he ，CHEN Feng ，MAO Hai-jun,. Analysis of changing rule of shear strength indexes of soft soil with consolidation degree[J]. , 2014, 35(S1): 106-112.

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