粗粒土与结构接触面的空间曲率效应试验研究  

Curvature Effect of Curved Surface Shear Strength for Coarse Grained Soils

作　　者：冯海华 陆勇 黄卉 FENG Haihua;LU Yong;HUANG Hui(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《土工基础》2025年第1期122-126,共5页Soil Engineering and Foundation

基　　金：江苏省高等学校基础科学(自然科学)研究项目(No.22KJB170020)。

摘　　要：基于土与结构的相互作用,考虑实际岩土工程中存在的三维空间曲面接触问题,采用剪切试验研究粗粒土曲面剪切强度受剪切面曲率半径的影响,得到了粗粒土曲面剪切强度随剪切面曲率半径增大呈非线性增长的趋势,这一趋势称为曲面剪切强度参数的曲率效应。试验结果表明,曲率效应只在一定竖压范围内明显,当竖压增大,曲率效应逐渐减弱并最终消失。最后借助理想球体模型定性初步分析了粗粒土曲率效应的存在机理,并分析了曲率效应与粒径及高压下颗粒破碎的关系,指出了细粒土以及高压条件下曲率效应消失的预测。In practical geotechnical field,failure planes are always 3D curved sliding surface.Their mechanical characteristics are different from the typical flat failure plane.Curved surface shear test is taken to consider the effects of failure plane's curvature to the shear strength of coarse-grained soils.The results show that the shear strength grows nonlinearly with the curvature radius'growth of shearing surface,this phenomenon is defined as the effect of curvature to curved surface shear strength.The results also show that the effect of curvature is obvious in a certain range of vertical stress,and the effect will be weakened and eventually disappeared as the vertical stress increasing.Finally,the ideal sphere model is used for qualitatively analyzing the mechanism of curvature effect and the relationship between effect and grain size and particle crushing under high pressure.It also points out the prediction of the disappearance of curvature effect in fine-grained soil and under high pressure.

关 键 词：粗粒土 曲率效应 曲面剪切 剪切强度 

分 类 号：TU411[建筑科学—岩土工程]