考虑微结构失稳的湿陷性黄土变形机理

黄土的湿陷性是工程界及水土保持工作者长期关心的一个问题。本文根据近年来对黄土细观结构的扫描电子显微镜观察及土力学试验成果,提出“湿陷变形系由于微结构失稳所引起“的假说,应用数学灾变理论建立了微结构失稳模型。并按照“微力学”及“损伤力学”等现代连续介质力学方法给出了湿陷性黄土的本构关系。计算结果表明,本文的理论可以成功地解释黄土湿陷交形的机理。为湿陷变形的力学研究提供了参考。     

关于黄土垂直节理形成机制的探讨

本文基于野外考察、理论分析和模拟实验,作者认为,重力在黄土体中大孔洞的上下边缘所引起的水平拉应力是导致黄土产生垂直节理的基本原因。本文首次从力学观点解释了黄土垂直节理的形成机制。     

A Study on the Generating Mechanism of Vertical Joints in Loess

Based on field investigation, theoretical analysis and model testing, the authors believe that the horizontal tensile stress caused by gravity at the top and bottom of big voids or holes is the primary rea-. son for the generation of vertical joints in loess. This paper explains the generation mechanism of vertical joints in loess from the viewpoint of mechanics for the first time.