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Development of a Practical Test Method for Friction Between Cohesive Soil and Structure Foundation

粘性土与结构基础之间摩擦力实用测试方法的开发

基本信息

批准号：
01850132
负责人：
KISHIDA Hideaki
金额：
$ 3.01万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850132/
关键词：
Friction Cohesive Soil Steel Test Method Simple Shear Test Surface Roughness Excess Pore Water Pressure 粘土室内試験

项目摘要

The purpose of this study is development of a practical test method for estimating the frictional resistance between cohesive soil and structure foundation. To start with, several sets of friction tests (1. and 2.) were carried out systematically to evaluate the efficiency of the test apparatus andto have a good grasp of the fundamental behavior of the friction. After that, friction tests (3.) were practiced with in-situ soil samples for estimating the skin frictions around piles.The knowledge acquired through this study are as follows :1. Friction tests between clay and steel :(1) There is only the shear deformation of a clay sample until the shear stress reaches the maximum value.(2) For smooth surface steel, the interface sliding occurs and the shear deformation of a clay sample stops after reaching the maximum shear stress.(3) There is the boundary steel roughness, R_b : if the steel roughness is larger than R_b, the interface sliding does not occur and the frictional resistance reaches the upper limiting value which is equal to the shear strength of a clay sample.2. Friction tests between cohesive soil and steel :Clay-sand mixtures have been used as cohesive soil samples.(1) The maximum shear stress is not affected by the clay-sand mixture ratio and steel roughness.(2) The more richly a soil sample has sand, the larger R_b is.(3) There is a complex behavior that the shear deformation of a soil sample occurs simultaneously with the interface sliding.3. Friction tests with in-situ soil samples :Two sets of friction tests were practiced by using undisturbed soil samples extracted from the ground around piles.Since the frictional resistances were in reasonably agreement with the skin frictions around piles, there is a possibility of the application of the test method of this study to practical use.

本研究旨在发展一种实用的黏性土与建筑物地基间摩阻力的测试方法。首先，几组摩擦测试（1。和2.）系统地进行了试验，以评价试验装置的效率，并有一个很好的掌握摩擦的基本行为。然后进行摩擦试验（3.）通过现场土样的试验，对桩侧摩阻力的估算进行了研究。粘土与钢之间的摩擦试验：（1）粘土试样只有剪切变形，直到剪应力达到最大值。(2)对于光滑表面的钢，发生界面滑动，粘土试样的剪切变形在达到最大剪应力后停止。(3)存在边界钢筋粗糙度R_B：当钢筋粗糙度大于R_B时，界面不发生滑移，摩擦阻力达到上限值，相当于粘土试样的抗剪强度.粘性土与钢之间的摩擦试验：粘土-砂混合物被用作粘性土样品。(1)最大剪应力不受土砂比和钢筋粗糙度的影响。(2)含砂量越高，R_B值越大。(3)土样的剪切变形与界面滑移同时发生，这是一个复杂的行为.原位土样的摩擦试验：采用桩周原状土样进行了两组摩擦试验，由于摩擦阻力与桩周摩阻力基本一致，因此本研究的试验方法有应用于实际的可能性。