Experiment study of coupling effect of initial shear stress and loading rate on pore water pressure model of soft clay

WANG Jun; YANG Fang; WU Yan-ping; HU Xiu-qing

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Experiment study of coupling effect of initial shear stress and loading rate on pore water pressure model of soft clay

更新时间：2026-06-25

- Experiment study of coupling effect of initial shear stress and loading rate on pore water pressure model of soft clay
- Vol. 32, Issue S1, (2011)
- 作者机构：
  
  1. 温州大学建筑与土木工程学院,浙江,温州,325035
  2. 温州市城建设计院,浙江,温州,325000
- 作者简介：
- 基金信息：
- DOI：
  CLC： O319.56
- Online First：16 May 2011，
  
  Published：2011
- 稿件说明：
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WANG Jun, YANG Fang, WU Yan-ping, et al. Experiment study of coupling effect of initial shear stress and loading rate on pore water pressure model of soft clay[J]. 2011, 32(S1).
DOI：

WANG Jun, YANG Fang, WU Yan-ping, et al. Experiment study of coupling effect of initial shear stress and loading rate on pore water pressure model of soft clay[J]. 2011, 32(S1). DOI：

摘要

通过GDS循环三轴试验系统，对循环荷载作用下饱和软黏土的孔压变化规律进行了研究，分析了循环应力比，初始剪应力与振动频率对孔隙水压力的影响。研究结果表明：随着循环应力比的增加，孔压发展速度增快。循环荷载作用下饱和软黏土存在临界循环应力比，通过孔压也可以确定其值大小。在循环初期，孔压率较大，随着循环时间的增加，孔压率逐渐减小。随着循环应力比的增加，孔压率增加。振动频率对孔压比-循环次数关系影响明显，随着频率的增加，孔压比减小；然而，当振动频率大于1 Hz时，振动频率对孔压比-时间与孔压率-时间关系影响不明显。随着初始剪应力的增大，孔压增加。初始剪应力对应变率具有显著影响；随着初始剪应力的增加，应变率增加。在对数坐标下，孔压率与时间呈线性关系。在上述试验基础上建立了孔压率与时间关系表达式，通过积分得到了循环荷载作用下饱和软黏土的动孔压模型

Abstract

he pore water pressure of saturated soft clay under cyclic loading is researched by GDS cyclic triaxial system. The effects of cyclic stress ratio，initial shear stress and vibration frequency on pore water pressure are analyzed. It is observed that the pore water pressure increases with the increase of cyclic stress ratio. There is critical cyclic stress ratio of soft clay under cyclic loading. The value of critical cyclic stress ratio can also be obtained by pore water pressure curves. At the beginning of cyclic loading

the pore water pressure rate is larger and then it decreases with the progressive of time. With the increase of cyclic stress ratio

the pore water pressure rate increases. The vibration frequency influences the relationship between pore water pressure ratio and cyclic number significantly; and the pore water pressure ratio decreases with the increase of frequency. However

the effect of vibration frequency on pore water pressure ratio-time and pore water pressure rate-time curves is indistinct at the frequency larger than 1Hz. With the increase of initial shear stress

both the pore water pressure ratio and pore water pressure rate increases. It shows linear relationship between pore water pressure rate and time at log-scale. Based on the test results

the empirical equation between pore water pressure rate and time is obtained. The pore water pressure model of soft clay under unidirectional cyclic compressive loading is obtained by integration.

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