卸荷条件下横观各向同性岩体扩容与能量特性分析

doi:10.16285/j.rsm.2017.06.007

›› 2017, Vol. 38 ›› Issue (6): 1589-1599.doi: 10.16285/j.rsm.2017.06.007

卸荷条件下横观各向同性岩体扩容与能量特性分析

杨以荣^{1, 2}，谢红强^{1, 2}，肖明砾^{1, 2}，刘建锋^{1, 2}，何江达^{1, 2}

1. 四川大学水力学与山区河流开发保护国家重点实验室，四川成都 610065；2. 四川大学水利水电学院，四川成都 610065

收稿日期:2016-07-09 出版日期:2017-06-12 发布日期:2018-06-05
通讯作者: 肖明砾，男，1981年生，博士，讲师，主要从事岩石力学与工程研究。E-mail: xiaomingl@scu.edu.cn E-mail:yangyirong99@163.com
作者简介:杨以荣，男，1993年生，硕士研究生，主要从事岩体力学参数及岩土工程数值模拟研究。
基金资助:
国家重点基础研究发展计划（973计划）（No.2015CB057903）；国家自然科学基金资助项目（No.51079092）。

Dilatancy and energy characteristics analysis of transverse-isotropic rock mass under triaxial unloading condition

YANG Yi-rong^{1, 2}, XIE Hong-qiang^{1, 2}, XIAO Ming-li^{1, 2}, LIU Jian-feng^{1, 2}, HE Jiang-da^{1, 2}

1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 2. College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China

Received:2016-07-09 Online:2017-06-12 Published:2018-06-05
Supported by:
This work was supported by the National Key Basic Research and Development Program of China (973 Program) (2015CB057903) and National Natural Science Foundation of China (51079092).

摘要/Abstract

摘要： 丹巴水电站引水隧洞围岩主要为石英云母片岩，位于高应力区，层状特征显著，属于典型的横观各向同性岩体，其扩容和能量特性问题突出。针对平行片理和垂直片理方向的试件，基于MTS815岩石力学试验平台，研究三轴卸荷条件下石英云母片岩的扩容特性及能量变化规律。研究表明：（1）平行组与垂直组试件的特征应力均随围压的增大而增大，两者间具有良好的线性关系；（2）平行组试件裂纹闭合应力、损伤扩容应力及峰值应力均大于垂直组，起裂应力低于垂直组；（3）平行组试件扩容参数（扩容指标及剪胀角）大于垂直组，且随着围压的增大，两组试件扩容特征相继减弱，试件扩容指标与围压呈良好的指数型分布，特征剪胀角与偏应力比呈良好的线性分布；（4）平行组与垂直组试件峰值点和残余点处能量值均随围压增加而增大，且与围压呈良好指数型分布，相同围压下，平行组试件峰值点处能量特征值及残余可释放应变能均大于垂直组，残余耗散能低于垂直组；（5）无论是峰值点还是残余点处，两组试件耗散能量值与剪胀角以及能量特征值与扩容指标间均呈现良好指数型关系。

关键词: 石英云母片岩, 横观各向同性, 三轴卸荷, 扩容, 能量特征, 相关性分析

Abstract: The surrounding rock of diversion tunnel in Danba Hydropower Station is mainly composed of quartz mica schist at the high-stress zone, which is typical transversely isotropic rock mass and has distinct layered characteristics with apparent dilatancy and high energy. Based on the MTS815 system, triaxial unloading tests were conducted to investigate the characteristics of dilatancy and energy change, and the loading direction was parallel and perpendicular to the schistosity of rock samples, respectively. The results demonstrate that the characteristic stress of both groups increased with confining pressure, which exhibited a good linear relationship with confining pressure. The crack closing stress, damage and expansion stress and peak stress of the parallel group were superior to those of the vertical group, whereas the crack stress was inferior to that of the vertical group. The dilatancy parameters of the parallel group were higher than vertical group. However, expansion characteristics of these two groups were weakened with the increase of confining pressure. Moreover, the index of expansion showed great agreement with confining pressure by an exponential distribution, and dilatancy angles had a linear relationship with the partial stress ratio. At the peak point and the residual point, the energy values of these two groups enhanced with confining pressure, and the energy values revealed good exponential distribution with confining pressure. Furthermore, under the same confining pressure, the energy characteristic value at the peak point and the residual released energy of the parallel group were greater than those of the vertical group. However, the residual dissipated energy of the parallel group was lower than that of the vertical group. For both groups, the relationship between the dissipated energy value and the dilatancy angle, together with the energy characteristic value and the dilatancy index, demonstrated good exponential distribution, which fit at the peak point as well as the residual point.

Key words: mica-quartz schist, characteristics of transversely isotropic, triaxial unloading, dilatancy, energy property, correlation analysis

中图分类号:

TU 458

杨以荣，谢红强，肖明砾，刘建锋，何江达, . 卸荷条件下横观各向同性岩体扩容与能量特性分析[J]. , 2017, 38(6): 1589-1599.

YANG Yi-rong, XIE Hong-qiang, XIAO Ming-li, LIU Jian-feng, HE Jiang-da, . Dilatancy and energy characteristics analysis of transverse-isotropic rock mass under triaxial unloading condition[J]. , 2017, 38(6): 1589-1599.

参考文献

相关文章 15

[1]	李建朋, 高岭, 母焕胜. 高应力卸荷条件下砂岩扩容特征及其剪胀角函数[J]. 岩土力学, 2019, 40(6): 2119-2126.
[2]	宋洪强, 左建平, 陈岩, 黎立云, 洪紫杰, . 基于岩石破坏全过程能量特征改进的能量跌落系数[J]. 岩土力学, 2019, 40(1): 91-98.
[3]	巴振宁, 周旭, 梁建文, . 横观各向同性凸起地形对平面qP-qSV波的散射[J]. 岩土力学, 2019, 40(1): 379-387.
[4]	陈锋, 张青庆, 姚威, 叶良良, . 含泥盐岩的扩容特性与剪胀角模型[J]. 岩土力学, 2018, 39(S2): 195-201.
[5]	王少杰，吕爱钟，张晓莉. 横观各向同性岩体中马蹄形隧洞的位移反分析方法[J]. , 2018, 39(S1): 495-504.
[6]	吴永胜，谭忠盛，余贤斌，喻渝，朱勇,. 不同加载方位角下单轴压缩千枚岩扩容特性[J]. , 2018, 39(8): 2747-2754.
[7]	陆建飞，周慧明，刘洋. 横观各向同性层状饱和土动力问题的反射、透射矩阵方法[J]. , 2018, 39(6): 2219-2226.
[8]	韩泽军，林皋，周小文，杨林青. 横观各向同性层状地基动应力响应的求解与分析[J]. , 2018, 39(6): 2287-2294.
[9]	艾智勇，张逸帆，王路君, . 层状横观各向同性地基平面应变问题的扩展精细积分解[J]. , 2018, 39(5): 1885-1890.
[10]	杨超，黄达，蔡睿，黄润秋,. 张开穿透型单裂隙岩体三轴卸荷蠕变特性试验[J]. , 2018, 39(1): 53-62.
[11]	吴永胜，谭忠盛，喻渝，姜波，余贤斌,. 川西北茂县群千枚岩各向异性力学特性[J]. , 2018, 39(1): 207-215.
[12]	王蕉，楚锡华，姜清辉. 一个与弹性应变能相协调的脆性横观各向同性材料破坏准则[J]. , 2017, 38(8): 2221-2226.
[13]	刘新荣，刘俊，李栋梁，何春梅，王子娟，谢应坤,. 不同初始卸荷水平对深埋砂岩力学特性影响规律试验研究[J]. , 2017, 38(11): 3081-3088.
[14]	张志增，李小昌，王克忠,. 考虑剪应力作用时横观各向同性岩体中圆形巷道位移反分析的惟一性[J]. , 2016, 37(S2): 449-460.
[15]	刘志勇，肖明砾，谢红强，何江达, . 基于损伤演化的片岩应力松弛特性[J]. , 2016, 37(S1): 101-107.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

卸荷条件下横观各向同性岩体扩容与能量特性分析

Dilatancy and energy characteristics analysis of transverse-isotropic rock mass under triaxial unloading condition

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0