考虑荷载方向效应的软硬相间层状岩体综合变形模量取值研究  

Parameter research for hard and soft layered rock mass of the integrated deformation modulus under practice building load

作　　者：周洪福[1,2] 刘彬 ZHOU Hong-fu;LIU Bin(Chengdu Center,China Geological Survey,Chengdu,Sichuan 610081,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Sichuan Geological Survey,Chengdu,Sichuan 610081,China)

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081 [2]山东科技大学地球科学与工程学院,山东青岛266590 [3]四川省地质调查院,四川成都610081

出　　处：《岩土力学》2020年第9期3066-3076,共11页Rock and Soil Mechanics

基　　金：第二次青藏高原综合科学考察研究资助(No.2019QZKK0904);四川省重点研发项目(No.2020YFS0296);中国地质调查局项目(No.20160272,No.20190505)。

摘　　要：基于整体受力特征,提出用综合变形模量来表征多层层状岩体的整体变形效应。通过工程实例,建立体现各项异性特性的软硬相间层状岩体综合变形模量理论模型。采用弹性力学分别推求受力方向平行、垂直以及与层面呈任意角度情况下多层层状岩体综合变形模量理论解,并检验理论解一致性。推导受力方向平行层面的综合泊松比理论解和受垂直层面剪应力作用的综合剪切模量理论解。室内分别建立层面倾角为0°、30°、60°、90°的软硬相间层状岩体地质模型,试验获得其综合变形模量。对比分析试验值和理论计算值,两者差别在4.20%~8.77%之间,验证理论解的正确性。从理论分析和试验角度,研究工程荷载方向效应对层状岩体变形特性的影响,丰富完善现有层状岩体力学参数研究理论和技术方法。Based on the overall loading characteristics,this study was to propose an integrated deformation modulus for representing the integrated loading and deformation effect of the layered rock mass.The analysis of engineering cases was conducted to establish a theoretical model,which reflected the anisotropic characteristics of the integrated deformation modulus of the hard and soft layered rock mass.The theoretical solutions of integrated deformation modulus of hard and soft layered rock mass were separately deduced by using the plastic mechanics under the parallel,vertical and arbitrary directions of the stress to the bedding planes.The consistency of the theoretical solutions was also verified.We deduced the theoretical description of the integrated Poisson's ratio of the parallel direction of stress to bedding planes and the integrated shear modulus of the vertical direction of shear stress to bedding planes.The integrated deformation modulus was obtained by the geological model testing the hard and soft layered rock mass of the dip angles at 0°,30°,60° and 90°.The differences in the results from the laboratory test and the integrated deformation modulus were from 4.20 to 8.77%;therefore,the theoretical equation achieved great effects.This research studied the influence of engineering load direction on the deformation properties of layered rock mass by using theoretical analysis and laboratory tests,and improved the theory and technical methods for studying the mechanical parameters of the existing layered rock mass.

关 键 词：层状岩体 荷载方向效应 理论模型 综合变形模量 

分 类 号：TU452[建筑科学—岩土工程]