水岩和冻融作用下岩石的脆性评价  

Evaluation of Rock Brittle Characteristic under Water-rock Interaction and Freezing-thawing Conditions

作　　者：高远 温韬 郭威[1] 贾文君 黄德昕 胡明毅[1,2] GAO Yuan;WEN Tao;GUO Wei;JIA Wenjun;HUANG Dexin;HU Mingyi(School of Geosciences,Yangtze University,Wuhan 430100,Hubei,China;Jiacha County Branch of Hubei Yangtze University Technology Development Co.,Ltd.,Shannan 856499,Xizang,China;Badong National Observation and Research Station of Geohazards,China University of Geosciences,Wuhan 430074,Hubei,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]湖北长大科技开发有限公司加查分公司,西藏山南856499 [3]中国地质大学(巴东)湖北巴东地质灾害国家野外科学观测研究站,湖北武汉430074

出　　处：《水力发电》2024年第1期26-32,61,共8页Water Power

基　　金：国家自然科学基金资助项目(42002268);西藏自治区科技项目(XZ202202YD0007C,XZ202301YD0034C);湖北巴东地质灾害国家野外科学观测研究站开放基金(BNORSG-202204)。

摘　　要：在总结目前已有的部分岩石脆性评价方法,并论述各评价方法优缺点的基础上,考虑岩石应力-应变曲线和能量演化规律,提出一种新的岩石脆性评价的计算方法,结合红层软岩在天然工况和水岩作用下,以及砂岩在天然工况和冻融作用下的三轴试验结果验证其有效性。结果表明,无论是天然工况还是水岩作用下,红层软岩脆性指数都随围压的增加而减少;各围压红层软岩在水岩作用下的脆性较天然工况下更弱,平均减少约44%。无论是天然工况还是冻融作用下,砂岩的脆性都随围压的增加而减少;各围压砂岩在冻融作用下的脆性低于天然工况,平均减小为13%。On the basis of summarizing current methods for evaluating rock brittleness and discussing the advantages and disadvantages of each method,a new calculation method for the brittleness evaluation of rock is proposed by considering the stress-strain curve and energy evolution law of rocks.The proposed new brittleness evaluation method is verified by the triaxial test results of the red bed soft rock under water-rock action and natural condition,and the sandstone under natural condition and freezing-thawing action.The results show that the new brittleness index decreases with the increase of confining pressure,regardless of the natural state or water-rock interaction,and the rock mass s brittleness under water-rock interaction is weaker than that under natural conditions with an average reduction of approximately 44%under various confining pressures.In addition,the brittleness of rocks decreases with the increase of confining pressure under both natural and freezing-thawing conditions,and the brittleness of sandstone under freezing-thawing is lower than that under natural conditions with an average reduction of approximately 13%under different confining pressures.

关 键 词：岩石力学 脆性评价 水岩作用 冻融作用 岩石能量 全应力-应变曲线 

分 类 号：TU452[建筑科学—岩土工程]