桩基础与红层泥岩接触面剪切特性试验研究  

Experimental Study on Shear Characteristics of Contact Surface between Pile Foundation and Red Mudstone

作　　者：韩依婷 肖锐 胡俊卿 

机构地区：[1]兰州交通大学土木工程学院,甘肃 兰州 [2]甘肃省交通规划勘察设计院股份有限公司,甘肃 兰州 [3]甘肃建投建设有限公司,甘肃 兰州

出　　处：《土木工程》2024年第7期1204-1216,共13页Hans Journal of Civil Engineering

摘　　要：桩基础与红层泥岩接触面剪切特性研究是桩基承载机理研究的基础。本文以实际工程为例,通过桩基础与红层泥岩接触面剪切试验,研究不同粗糙度及不同法向应力作用下桩基础与红层泥岩接触面的剪切力学特性,试验结果表明:不同法向应力下接触面的剪切力随剪切位移的增大而增大,达到峰值剪应力后逐渐减小并趋于稳定,符合典型的剪切位移软化规律;接触面的抗剪强度随粗糙度的增加而增大,抗剪强度的均值差与粗糙度增值成正线性相关;可根据不同法向应力与粗糙度来确定实际桩基础与红层泥岩接触面抗剪强度。The shear characteristics of the contact surface between pile foundation and red mudstone is the basis of the research on the bearing mechanism of pile foundation. Taking practical projects as an example, this paper studies the shear mechanical properties of the contact surface between pile foundation and red mudstone under different roughness and different normal stresses through shear tests on the contact surface between pile foundation and red mudstone. The test results show that: under different normal stresses, the shear force of the contact surface increases with the increase of shear displacement, and gradually decreases and tends to be stable after reaching the peak shear stress, which accords with the typical softening law of shear displacement. The shear strength of contact surface increases with the increase of roughness, and the mean difference of shear strength has a positive linear correlation with the increase of roughness. The actual shear strength of the contact surface between pile foundation and red mudstone can be determined according to different normal stress and roughness.

关 键 词：桩基础 红层泥岩 接触面抗剪强度 粗糙度 法向应力 

分 类 号：TU4[建筑科学—土工工程]