不同加、卸荷速率下软硬互层岩体组构效应的水-力耦合特征

项目名称： 不同加、卸荷速率下软硬互层岩体组构效应的水-力耦合特征

项目编号： No.51309219

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 徐鼎平

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 25万元

中文摘要： 如何揭示软硬互层岩体组构效应在各向异性应力场与孔隙水压应力场叠加条件下水-力耦合特征的率相关性并予以量化评价，一直是深部岩体工程安全建设的一个客观需求和基础研究课题。本项目基于不同加、卸荷速率和固结不排水条件下的真三轴应力路径及直剪试验，并结合同步孔隙水压力、声发射测试及破坏面电镜扫描，从宏、细观层面揭示坚硬母岩和软弱夹层共同受载时的组构效应，探究不同加、卸荷速率下软弱夹层孔隙水压力、厚度、产状、粒组及其与母岩界面形貌等组构要素对软硬互层岩体强度的影响；建立描述软硬互层岩体多种破坏模式的率相关复合强度准则及硬化法则并嵌入通用数值计算程序，实现描述不同加、卸荷速率下组构效应水-力耦合特征的率相关各向异性模型；将该模型应用于受软弱夹层影响的白鹤滩水电站地下厂房开挖过程的模拟并检验其适用性。本项目有望为受软弱夹层影响的大型复杂地下工程开挖方式（非钻爆法）和施工参数的选择提供理论依据。

中文关键词： 软硬互层岩体；组构效应；各向异性；弹塑性耦合；破坏机制

英文摘要： How to reveal and evaluate the hydro-mechanics coupling characteristic of the fabric effect on alternatively distributed soft and hard rockmass (ADSHRM) under anisotropic stress field and pore water pressure stress field is a objective needs and fundmantal research topic for the safety construction of deep engineering rock mass. This study will conduct a series of ture triaxial stress path and direct shear tests under consolidated undrained condition at different loading and unloading rates combining with pore water pressure,AE and SEM testing to reveal the fabric effect which hard host rock and weak intercalated layer present while bearing loads together from macroscopic and mesoscopic levels.The effect of weak intercalated layer/host rock interface morphology, the thickness, dip, and particle breakage of weak intercalated layer on the rate-dependent strength of ADSHRM，will be explored based on the testing results. A strength criterion depicting different failure modes and a hardening rule describing the influence of dirfferent stress paths will be established.After embedding the strength criterion and hardening rule in the FLAC3D,the anisotropic rate-dependent constitutive model which discribes the hydro-mechanics coupling characteristic of the fabric effect of ADSHRM will be implemented and applied to model

英文关键词： alternatively distributed soft and hard rockmass；fabric effect；anisotropy；elastic-plastic coupling；failure mechanism