含单裂隙岩体蠕变破裂裂纹扩展演化规律研究  

Study on the meso-crack propagation and evolution law of creep fracture in rock mass with single fissure

作　　者：赵娜[1] 孟利新 张怡斌 ZHAO Na;MENG Lixin;ZHANG Yibin(College of Mechanics and Engineering,Liaoning Technical University,123000 Fuxin,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,阜新123000

出　　处：《应用力学学报》2023年第5期1106-1116,共11页Chinese Journal of Applied Mechanics

基　　金：国家重点研发计划资助项目(No.2017YFC1503101);辽宁省重点科技创新基地联合开放基金资助项目(No.2020-KF-13-06);辽宁省教育厅资助项目(No.LJ2020JCL013)。

摘　　要：岩体内部存在大量不同尺寸裂隙,形成不同结构形式的裂隙岩体,裂隙的存在会降低岩体的力学性能,对于岩体工程的整体稳定性具有很大的影响。本研究基于滑动翼裂纹模型对恒定载荷下含单裂隙岩体蠕变变形进行了理论推导和分析,基于MAPLE软件直观给出恒定载荷下裂隙角度、长度对蠕变变形的影响,采用连续-非连续数值分析软件GDEM,对预制单裂隙在不同倾角、不同长度情况下岩体的蠕变破裂裂纹扩展进行数值模拟。通过理论分析和数值模拟可以看出,岩体蠕变速率随着裂隙长度的增大而增大;随着裂隙角度的增加出现先增大后减小的趋势,其中裂隙倾角为30°时蠕变速率最大。含单裂隙岩体蠕变破裂裂纹扩展规律的研究可为岩体工程蠕变破裂规律研究及蠕变治理提供一定的理论依据和参考。There are multiple cracks of different sizes in rock mass,forming cracked rock masses of different structural forms.The existence of cracks not only reduces the mechanical properties of rock mass,but also significantly affects the overall stability of rock mass engineering.Based on the sliding wing crack model,this paper theoretically deduces and analyzes the creep deformation of rock mass with single fracture under constant load.Based on the MAPLE software,the impact of the crack angle and length on the creep deformation under constant load is intuitively given.Apart from that,continuous-discontinuous numerical analysis software GDEM is used to numerically simulate the creep rupture crack propagation of rock mass under different inclination angles and different lengths of prefabricated single fissures.By theoretical analysis and numerical simulation,it can be observed that the creep rate of rock mass increases with the increase of crack length.Moreover,with the increase of crack angle,the creep rate first increases and then decreases,and it is the largest when the crack inclination angle is 30°.In short,the study on creep rupture crack propagation law of rock mass with single fissure can provide certain theoretical basis and reference for research on creep rupture law and creep control of rock mass engineering.

关 键 词：单裂隙 蠕变破裂 裂纹扩展 演化规律 恒定载荷 

分 类 号：TU45[建筑科学—岩土工程]