| 自然与饱水条件下异性结构面的剪切特性研究 |
| |
| 引用本文： | 鲁祖德,陈从新.自然与饱水条件下异性结构面的剪切特性研究[J].岩土力学,2012,33(Z1):13-18. |
| |
| 作者姓名： | 鲁祖德 陈从新 |
| |
| 作者单位： | 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
| |
| 基金项目： | 国家自然科学基金资助(No.10872207) |
| |
| 摘 要： | 利用室内剪切试验装置，开展不同正应力、自然与饱水条件下岩体异性结构面的剪切试验，分析异性结构面的剪切变形和强度特性，利用JRC-JCS抗剪强度力学模型将试验结果与计算结果进行对比分析。结果表明，（1）异性结构面的剪切变形曲线属于弹塑性残余变形类型。相比自然状态试件，饱水试件的弹性区减小，较早进入峰值区或塑性区；（2）异性结构面的剪切刚度均随法向力的增大而增大，但同一正应力下饱水试件的剪切刚度要小于自然状态的剪切刚度，在低法向力下尤为显著；（3）水对岩体异性结构面剪切强度参数有不同程度的弱化，尤其对内摩擦角 的劣化明显；（4）只要计算参数选取得当，并考虑实际岩体的受力及水等情况，JRC-JCS计算模型可以为实际工程岩体的结构面强度提供较为准确的参数。
|
| 关 键 词： | 异性结构面 剪切变形 剪切强度 JRC-JCS模型 |
| 收稿时间： | 2011-09-30 |
Study of shear property of heterogeneous structural surface under natural and saturated condition |
| |
| LU Zu-de,CHEN Cong-xin.Study of shear property of heterogeneous structural surface under natural and saturated condition[J].Rock and Soil Mechanics,2012,33(Z1):13-18. |
| |
| Authors: | LU Zu-de CHEN Cong-xin |
| |
| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
| |
| Abstract: | The direct shear tests of heterogeneous structural surface in rock mass taken from the engineering site for Ling’ao nuclear power project are investigated under different normal stresses and water condition.The curves of shear stress-displacement change of heterogeneous structural surface are obtained;and the shear strength property and deformability of heterogeneous structural surface are analyzed.Comparison with the computing results using JRC-JCS model and the testing results is presented.The research results show that the shear stress-shear deformation curves of heterogeneous structural surface present an elastoplastic residual deformation and the saturated specimens have a smaller elastic region and enter into peak region or plastic region earlier.The shear stiffness of saturated specimens is lower than one of natural specimens under the same normal stress,especially for a low normal force.Water makes obvious effects on the strength parameters of rockmass heterogeneous structural surface;especially on inner friction angle.The JRC-JCS model can provide reliable values for the shear strength parameters of joints in a real geotechnical project. |
| |
| Keywords: | heterogeneous structural surface shear deformation shear strength JRC-JCS model |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
