基于Hoek-Brown准则的溶蚀作用下灰岩损伤模型研究  

Construction of Hoek-Brown constitutive model under dissolution

作　　者：何城虎 刘扬[1,2] 商妤凡 HE Cheng-hu;Liu Yang;Shang Yu-fan(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,Yichang 443002,China;School of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《灾害与防治工程》2021年第1期1-10,共10页Disaster and Control Engineering

摘　　要：处于溶蚀作用下的岩体力学性质会发生劣化进而导致岩体的稳定性降低,并且具有不同初始损伤的岩体受溶蚀作用的影响有差异,因此研究不同裂纹发育扩展状态的岩体在溶蚀作用下的力学性质本构楔型具有重要意义。首先,基于Hoek-Brown本构楔型可以用于描述灰岩的力学特性,且灰岩在溶蚀作用下的力学破坏机制基本不变,建立起溶蚀作用下Hoek-Brown本构模型。然后通过灰岩单轴压缩试验结果,并结合Flac3D软件数值模拟得出模型参数。上述研究成果可对溶蚀作用下的洞室围岩稳定性动态演化规律的相关计算与数值模拟提供理论支撑。The mechanical properties of the rock mass under the action of dissolution will deteriorate,which will lead to the reduction of the stability of the rock mass,and the rock mass with different initial damage is affected by the dissolution action differently.The mechanical properties under the constitutive model are of great significance.First,based on the Hoek-Brown constitutive model,which can be used to describe the mechanical properties of limestone,and the mechanical failure mechanism of limestone under dissolution is basically unchanged,the Hoek-Brown constitutive model under dissolution is established.Then,the model parameters are obtained from the results of the limestone uniaxial compression test combined with the numerical simulation of Flac3D software.The above research results can provide theoretical support for the relevant calculation and numerical simulation of the dynamic evolution law of cavern surrounding rock stability under dissolution.

关 键 词：灰岩 溶蚀作用 裂隙 HOEK-BROWN 本构模型 

分 类 号：TU4[建筑科学—土工工程]