| 非贯通类节理岩体剪切变形规律分析 |
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| 引用本文： | 唐志成,夏才初,丁增志.非贯通类节理岩体剪切变形规律分析[J].岩土力学,2011,32(8):2353-2358. |
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| 作者姓名： | 唐志成 夏才初 丁增志 |
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| 作者单位： | 1. 同济大学岩土及地下工程教育部重点实验室,上海200092;同济大学地下建筑与工程系,上海200092
2. 中国中铁二院集团有限责任公司,成都,610031 |
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| 基金项目： | 国家自然科学基金资助项目(No.40972178) |
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| 摘 要： | 通过直剪条件下的模型试验研究具有相同连通率、含不同起伏角的共面闭合节理在不同法向应力作用下的剪切变形特征。试验结果表明:在达到峰值剪切强度前,剪切应力-位移曲线具有明显的线性段与非线性段;岩桥在法向与剪切荷载的共同作用下会产生一定程度的弱化,积累到一定程度时宏观表现为剪切应力软化。详细阐述了试验过程中裂纹发展的4个阶段并描述了剪切应力-剪切变形曲线变化的特征,提出一个能反映剪切应力-剪切变形曲线全过程的经验本构模型。新模型采用分段函数描述曲线变化特征。直剪试验数据分析表明,该模型能够拟合剪切应力-剪切变形变化发展趋势且具有较高的拟合精度,验证了模型的正确性。最后,对其存在的不足亦进行了简要分析。
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| 关 键 词： | 岩石力学 非贯通节理 模型试验 裂纹扩展 应力-变形关系 |
| 收稿时间： | 2010-12-30 |
Analysis of shear deformation law for intermittent jointed rock mass |
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| TANG Zhi-cheng,XIA Cai-chu,DING Zeng-zhi.Analysis of shear deformation law for intermittent jointed rock mass[J].Rock and Soil Mechanics,2011,32(8):2353-2358. |
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| Authors: | TANG Zhi-cheng XIA Cai-chu DING Zeng-zhi |
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| Institution: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China |
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| Abstract: | Through model tests under direct shear condition,the shear deformation of rock containing coplanar close joints with the same continuity and different undulating angles are studied under different normal stresses.Direct shear tests show that before peak shear strength,the shear stress-displacement curve of intermittent joint has linear and nonlinear segments;the rock bridge produces some degree of weakening under normal and shear loads;and shows macroscopic shear stress softening when accumulated to some de... |
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| Keywords: | rock mechanics intermittent joint model test crack development stress-deformation relation |
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