摘要
深部复杂环境中热力条件下岩石破裂机理是当前研究热点之一。采用统计方法对工程温压内花岗岩单轴、三轴压缩、三轴卸荷试验条件下宏观破裂特征进行了分区分析,并探讨了其机理。结果显示:低温低围压区(20~40℃、0~5 MPa)岩样以剪切破坏为主,伴有次级张拉裂缝。低温高围压区(20~40℃、15~30 MPa)岩样为剪切破坏,且随着围压升高,出现多个剪切破裂面。高温低围压区(60~130℃、0~5 MPa)岩样为张拉破坏。高温高围压区(60~130℃、15~30 MPa)岩样为剪切破坏。围压增加试样峰值强度明显增加,升温试样峰值强度变化不大。研究表明:在工程温压内,岩样性能主要受围压影响;温度对岩样破裂方式有一定的影响,尤其是低围压区。针对温压耦合条件,传统的考虑单一变量的分析结果偏于片面,而分区考虑双变量的分析结果更为客观合理;宜建立多破裂面复合型模型探讨其发生机理。
The mechanism of rock fracture under deep complex environment,especially thermal-mechanical coupling conditions,is one of the hotspots in the current research. Combining testing results of uniaxial,triaxial compression and triaxial unloading tests under engineering temperature and pressure,the macro fracture characteristics and mechanism of granite were analyzed from the view of statistics. The results show that at low temperature and low confining pressure area（ 20 -40 ℃,0 -5 MPa）,the rock samples are mainly shear failure,accompanied by secondary tensile cracks. At low temperature and high confining pressure area（ 20 - 40 ℃,15 - 30 MPa）,rock samples are shear failure,and with the increase of confining pressure,there are more shear fracture surfaces. At high temperature and low confining pressure area（ 60 - 130 ℃,0 - 5 MPa）,rock samples are tensile failure. At high temperature and high confining pressure area（ 60 -130 ℃,15 -30 MPa）,the rock samples are mainly shear failure. The peak strength of the samples increased significantly with the increase of confining pressure,while little changes with the increasing of temperature. The results show that under the engineering temperature and pressure the performance of rock samples are mainly affected by the confining pressure. However,the temperature has a certain influence on the fracture mode,especially in the low confining pressure area. For thermal-mechanical coupling conditions,the traditional single variable analysis＇ results are biased,while considering two variables analysis＇ s results would be more objective and reasonable. It would be better to establish a multi-fracture surface to explore its mechanism.
作者
高美奔
李天斌
陈国庆
马春驰
阴红宇
GAO Mei-ben;LI Tian-bin;CHEN Guo-qing;MA Chun-chi;YIN Hong-yu(College of Environment and Civil Engineering,State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;Sichuan Electric Power Design Institute,Chengdu 610072,China)
出处
《科学技术与工程》
北大核心
2018年第15期13-18,共6页
Science Technology and Engineering
基金
国家自然科学基金(41230635
41172279)
地质灾害防治与地质环境保护国家重点实验室课题(SKLGP2013Z004)资助
关键词
岩石工程
温度
破裂特征
机理
统计方法
分区
rock engineering
temperature fracture
characteristics mechanism
statistical meth-ods subregion
作者简介
高美奔（1988-），男，博士研究生。E-mail：578209337@qq．com。;通信作者简介：李天斌（1964-），男，博士，教授，博士研究生导师。研究方向：地下工程和斜坡地质灾害。E-mail：ltb@cdut．edu．cn。
