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| 弹塑脆性岩土材料中柱形孔扩张大应变解 | |
| 引用本文： | 汪鹏程,刘干斌,朱向荣.弹塑脆性岩土材料中柱形孔扩张大应变解[J].岩土力学,2007,28(3):587-592. |
| 作者姓名： | 汪鹏程 刘干斌 朱向荣 |
| 作者单位： | 1. 合肥工业大学,土木建筑工程学院,合肥,230009 2. 宁波大学,土木工程系,宁波,315211 3. 浙江大学,岩士工程研究所,杭州,310027 |
| 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，对柱形孔扩张问题进行求解，得出了扩张率-扩张压力的解析表达式。算例分析表明，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；是否考虑中间主应力对屈服的影响，对解答也有明显的影响。 |
| 关 键 词： | 弹塑脆性 柱形孔扩张 中间主应力 大应变 |
| 文章编号： | 1000-7598-（2007）03-0587-06 |
| 收稿时间： | 2005-04-21 |
| 修稿时间： | 2005-04-21 |
Solution to cylindrical cavities expansion in elastoplastic-brittle materials considering large strain |
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| WANG Peng-cheng,LIU Gan-bin,ZHU Xiang-rong.Solution to cylindrical cavities expansion in elastoplastic-brittle materials considering large strain[J].Rock and Soil Mechanics,2007,28(3):587-592. | |
| Authors: | WANG Peng-cheng LIU Gan-bin ZHU Xiang-rong |
| Institution: | 1. College of Civil Engineering, Hefei University of Technology, Hefei 230009, China; 2.Department of Civil Engineering, Ningbo University, Ningbo 315211, China; 3. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China |
| Abstract: | Based on stress dropping model, an elastoplastic-brittle model is established by using a softening threshold value to model the characterof the geotechnical materials, twin shear strength theory and non-associated flow principle are used, and We large strain of softening zone is considered, a solution to cylindrical cavities expansion in elastoplastic-brittle materials is obtained. An example shows that the softening threshold value remarkably influences the deformations and range of the plastic zone; smaller threshold value leads greater expansion deformation, plastic zone range, and ratio of softening zone to entire plastic Zone; and that considering the effects of intermediate principle stress on plastic yield or not, obviously influences the results. |
| Keywords: | elastoplastic-brittle cylindrical cavity expansion intermediate principal stress large strain |
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