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Experimental and Analytical Research on Frictional Behavior between Cohesive Soil and Construction Materials during Earthquake

地震过程中粘性土与建筑材料摩擦行为的试验与分析研究

基本信息

批准号：
62460167
负责人：
KISHIDA Hideaki
金额：
$ 3.2万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62460167/
关键词：
Friction Clay Steel Direct Shear Test Pore Pressure Consolidated Undrained Shear Effective Stress 室内実験

项目摘要

In this study several sets of element tests on the frictional resistance between clay and steel were carried out. The factors influencing the frictional resistance selected in this study are surface roughness of steel, rate of loading and consolidation pressure of clay. Tests were carried out by the shear box type apparatus under monotonic or cyclic loading. The results are compared to the results of shear tests of clay on similar condition. Pore water pressure was measured on the surface of steel.The knowledge aquired through this study are as follows: 1. It was found that there was the boundary roughness,R_b, by reason of follows; if the surface roughness is larger than R_b, horizontal displacement at peak strength, peak strength, residual strength and friction angle between clay and steel in terms of effective stress have upper limiting values. In contrast, if the surface roughness is smaller than R_b, each above value increses with surface roughness. 2. The above upper limiting values nearly agree with the values of shear tests of clay. Therefore, if the surface roughness is smaller than R_b, the slip occurs between clay and steel, and if the surface roughness is larger than R_b, the failure occurs in clay specimen. 3. The peak strength is much influenced by rate of loading with increse of surface roughness, but the residual strength is not influenced. This behavior is found in shear tests of clay. 4. The friction angle between clay and steel in terms of effective stress is not influenced by consolidation pressure of clay, and increses with surface roughness. 5. Under cyclic loading, the shear stress settles down to the constant value with several cycles when the surface of steel is smooth, and decreses gradually when the surface of steel is rough or in shear tests of clay.

本文进行了几组土-钢间摩擦阻力的单元试验。本研究中选取的影响摩擦阻力的因素为钢筋表面粗糙度、加载速率和粘土固结压力。试验采用剪切箱型试验装置，在单调荷载和循环荷载作用下进行。并与类似条件下的粘土剪切试验结果进行了比较。通过对钢表面孔隙水压力的测量，获得了以下几点认识：1。结果表明，存在边界粗糙度R_B，当表面粗糙度大于R_B时，峰值水平位移、峰值强度、残余强度和粘钢摩擦角（以有效应力表示）均存在上限值。当表面粗糙度小于R_B时，上述各值均随表面粗糙度的增大而增大。2.上述上限值与粘土的剪切试验值基本一致。因此，当表面粗糙度小于R_B时，粘土与钢之间发生滑移，而当表面粗糙度大于R_B时，粘土试件发生破坏。3.随着表面粗糙度的增加，加载速率对峰值强度的影响较大，但对残余强度的影响不大。这种行为在粘土的剪切试验中发现。4.以有效应力表示的土-钢摩擦角不受土固结压力的影响，随表面粗糙度的增大而增大。5.在循环荷载作用下，当钢表面光滑时，剪应力经过几个循环后趋于恒定，而当钢表面粗糙或粘土剪切试验时，剪应力逐渐减小。