弹塑脆性岩土材料中球形孔大应变扩张分析  

Analysis of spherical cavities expansion in elastoplastic-brittle materials considering large strain

作　　者：汪鹏程[1] 张红亚[1] 

机构地区：[1]合肥工业大学土木建筑学院,合肥230009

出　　处：《安徽建筑工业学院学报（自然科学版）》2008年第2期17-22,共6页Journal of Anhui Institute of Architecture(Natural Science)

摘　　要：在应力跌落模型基础上引进软化阈值,建立弹塑脆性模型,模拟岩土材料的脆性软化特性,采用双剪统一强度理论和不相关联流动法则,考虑软化区的大应变,对球形孔扩张问题进行求解,得出了扩张-压力的解析表达式。通过算例分析,得出软化阈值对扩张变形和塑性区范围影响显著,软化阈值越小,扩张变形和塑性区范围越大,且软化区占整个塑性区的比重越大;考虑中间主应力对屈服的影响与否,对解答也有明显的影响。On the base of stress dropping model, a elastoplastic-brittle model was introduced by using a softening valve to model the character of the geotechnical materials, twin shear strength theory and non-associated flow principle ware used, and the large strain of softening zone was considered, a solution to spherical cavities expansion in elastoplastic-brittle materials was obtained. An example shows that the softening valve remarkably influences the deformations and range of the plastic zone, smaller valve leads greater expansion deformation, plastic zone range, and ratio of softening zone to entire plastic zone; that considering the effects of intermediate principle stress on plastic yield or not obviously influences the results.

关 键 词：弹塑脆性 球形孔扩张 中间主应力 大应变 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]