岩土力学2018，Vol.39Issue(3)：831-838,871,9.DOI:10.16285/j.rsm.2017.1933
超孔隙水压力对低塑性黏性土桩土界面抗剪强度的影响
Influence of excess pore water pressure on shear strength of pile-soil interface in clayey soil
摘要
Abstract
It's important to study the variation of shear strength and parameters of pile-soil interface for clayey soil with the excess pore water pressure in engineering practice.A series of direct shear test with different interface roughness,water contents and shearing rates is performed using the large-scale direct shear apparatus with constant normal stiffness.The effect on excess pore water pressure is examined under different test conditions.Influence of excess pore water pressure on shear strength of pile-soil interface in clayey soil is obtained.The results show that the excess pore water pressure decreases,and the shear strengths of pile-soil interface,effective cohesion and effective coefficients of friction increase with the increasing interface roughness.The excess pore water pressure increases and the shear strength of pile-soil interface decreases with the increasing water content.The main influence of increasing water content on shear strength of pile-soil interface is changing the cohesion.The cohesion first increases and then decreases.The influence on the coefficients of friction of pile-soil interface is little.The excess pore water pressure increases and the shear strengths of pile-soil interface also decrease with the increasing shear rate.The cohesion of pile-soil interface first increases and then decreases,but the variation is less than 2 kPa,and the little influence on the coefficients of fi-iction of pile-soil interface.The change of shear strength and parameters is influenced by variation of excess pore water pressure,depending on interface roughness,water contents and shear rates.This experimental research is useful for relative engineering design.关键词
静压桩/超孔隙水压力/直剪试验/界面阻力/硅压阻式传感器Key words
jacked pile/excess pore water pressure/direct shear tests/interface resistance/silicon piezoresistive sensor分类
建筑与水利引用本文复制引用
王永洪,张明义,刘俊伟,白晓宇..超孔隙水压力对低塑性黏性土桩土界面抗剪强度的影响[J].岩土力学,2018,39(3):831-838,871,9.基金项目
国家自然科学基金资助项目(No.51778312,No.41502304) （No.51778312,No.41502304）
山东省重点研发计划资助项目(No.2017GSF16107) （No.2017GSF16107）
山东省自然科学基金资助项目(No.ZR2016EEP06).This work was supported by the National Natural Science Foundation of China (51778312,41502304),Shandong Key Research and Development Program (2017GSF16107) and Shandong Provincial Natural Science Foundation of China (ZR2016EEP06). （No.ZR2016EEP06）
