基于模拟的岩芯脆性室内评价方法对比与分析  

Analysis and contrast of indoor brittleness evaluation methods for rock mass based on the simulation

作　　者：李明[1] 马收[1] 夏英杰[2] 任占春[1] 黄波[1] 李爱山[1] 李连崇[2] 

机构地区：[1]中国石油化工股份有限公司胜利油田分公司石油工程技术研究院,山东东营257000 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《辽宁工程技术大学学报（自然科学版）》2016年第8期859-865,共7页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金(51479024);国家重点基础研究发展计划项目(2014CB047103)

摘　　要：为寻找更加有效的岩芯脆性室内评价方法,运用有限元软件模拟了岩芯关键力学参数对其脆性破坏特征的影响,计算并分析了脆性指数B1~B6.结果表明：随着弹性模量的增加和泊松比的减小,岩体脆性增强;随着抗压强度和压拉比的增大,岩体试样在破坏特征上脆性增强,但通过对围压和残余强度系数对岩体脆性指数的计算分析,揭示了抗压强度和压拉比对于岩体脆性影响的实质;围压是影响岩体脆性的外在因素,随着围压的增加,岩体脆性减小;另外,通过对脆性指数的方法比较,验证了B6.判断岩体脆-塑性的可行性.In rock mass mechanics, the rock core brittleness evaluation is one of the most important issues. In order to find the effective indoor evaluation method, the finite element numerical simulation software was used to simulate the forms of brittle failure which caused by the key mechanical parameters of rock cores. At the same time, the rock brittleness indexes of B1~B6 were calculated according to the numerical experiments. The following conclusions were obtained through the contrastive analysis of brittleness indexes： as the increase of elastic modulus and the decrease of Poisson＇s ratio, the brittle of rock mass increased; as the compressive strength and the increase of the ratio of compressive strength to the extension, the brittle fracture characteristics of rock specimen were enhanced. But through the analysis of brittleness indexes which caused by confining pressure and residual strength coefficient, the essence of brittle failure was revealed. The confining pressure is the external factor to the brittle failure of rock mass. With the increase of confining pressure, the rock brittle decreased. In addition, through the comparison of brittleness indexes, the feasibility of B6 was verified to measure the brittle of rock mass.

关 键 词：岩体脆性 脆性指数 裂纹扩展 围压作用 应力-应变曲线 

分 类 号：TU452[建筑科学—岩土工程]