黏性土中桩-土界面受力机制室内试验研究

发布时间：2018-01-05 08:48

本文关键词：黏性土中桩-土界面受力机制室内试验研究　出处：《岩土力学》2017年08期 　论文类型：期刊论文

【摘要】：通过黏性土与不同表面粗糙度混凝土板的室内直剪试验,模拟预制桩的界面受力性态。利用微型硅压阻式传感器测定桩-土界面孔隙水压力和土压力的变化,定量分析表面粗糙度对界面抗剪强度参数、界面阻力-剪切位移曲线的影响。试验结果表明:桩-土界面孔隙水压力约占法向应力的10%,实际工程中应考虑;提出桩-土界面阻力的概念,界面阻力由黏性土与混凝土之间黏着力和摩擦力两部分构成,其中摩擦力为界面法向有效土压力与界面摩擦系数的乘积。随着混凝土表面粗糙度的增加,界面黏着力增大且逐渐接近黏土自身黏聚力。表面粗糙度对界面摩擦系数影响较小,但对界面阻力有一定影响,桩-土界面峰值阻力和剪切位移均随粗糙度的增加而增大。试验结果能够为桩基工程的设计、施工与检测提供参考依据。
[Abstract]:The interfacial behavior of prefabricated piles was simulated by direct shear tests of clay and concrete slabs with different surface roughness. The pore water pressure and soil pressure at the pile-soil interface were measured by a micro silicon piezoresistive sensor. Quantitative analysis of the influence of surface roughness on interface shear strength parameters and interface resistance-shear displacement curves. The experimental results show that the pore water pressure at pile-soil interface accounts for about 10% of normal stress. Practical engineering should be considered; The concept of pile-soil interfacial resistance is proposed. The interfacial resistance is composed of two parts: adhesion force and friction force between clay soil and concrete. The friction force is the product of the interface normal effective earth pressure and the interface friction coefficient, and with the increase of the surface roughness of concrete. The surface roughness has little effect on the friction coefficient of the interface, but has a certain effect on the interfacial resistance. The peak resistance and shear displacement of pile-soil interface increase with the increase of roughness. The test results can provide a reference for the design, construction and inspection of pile foundation engineering.
【作者单位】：青岛理工大学土木工程学院;青岛理工大学蓝色经济区工程建设与安全协同创新中心;
【基金】：国家自然科学基金资助项目(No.51078196,No.41502304) 山东省自然科学基金青年基金项目(No.ZR2016EEQ08) 山东省高等学校科技计划项目(No.J16LG02) 青岛市应用基础研究计划项目(No.16-5-1-39-jch)~~
【分类号】：TU473.1
【正文快照】： This work was supported by the National Natural Science Foundation of China(51078196,41502304),the Shandong Provincial Natural Science Foundation ofChina(ZR2016EEQ08),the Higher Educational Science and Technology Program of Shandong Province(J16LG02)and

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