摘要
采用原位岩体力学试验对甘肃新集水库泥质粉砂岩岩体的抗剪断特性进行研究,确定抗剪断强度的标准值,为区域内工程建设优化设计及抗滑稳定验算提供参数。通过平推法进行现场混凝土与岩体接触面直剪试验,利用最小二乘法及图解法,对试验数据进行分析,并比较两种计算方法的优缺点。结果表明:混凝土—岩体接触面抗剪断的破坏过程主要分为线性阶段、屈服阶段和塑性变形阶段;研究区内泥质粉砂岩的混凝土—岩体抗剪断强度标准值f’=1.05,c’=0.28 MPa;岩体混凝土接触面剪切破坏以脆性破坏为主,具有明显的峰值强度和残余强度。研究区内泥质粉砂岩可满足工程施工和设计的要求,为当地的工程建设和岩石抗剪断特性理论研究提供依据。
This paper examines the shearing characteristics of rock mass of politic siltstone in Xinji reservoir of Gansu province by using in-situ rock mechanics to determine the standard value of shear-ing strength and provide parameters for the optimization design of engineering construction and anti-sliding stability calculation in this area.The direct shear testing of the interface between con-crete and rock mass is carried out by flat-pushing manipulation.The test data are analyzed by least square method and graphic method.Besides,the advantages and disadvantages of the two calculation methods are compared.The results show that the failure process of the direct shearing between con-crete and interface of rock mass can be divided into three stages,namely linear stage,yield stage and plastic deformation stage;the standard values of shearing strength of concrete-rock mass of politic siltstone in the study area aref'=1.05,C'=0.28 MPa;the shearing failure of interface between rock mass and concrete appears brittle with obvious peak strength and residual strength;the pelitic siltstone in the study area can meet the construction and design requirements of the project,and can provide a basis for the local engineering construction and theoretical study of shearing characteristics of rock.
作者
乔国锋
李彬
胡坪伸
张文
QIAO Guofeng;LI Bin;HU Pingshen;ZHANG Wen(Institute of Survey and Design of Water Conservancy and Hydropower Co.,Ltd of Gansu Province,Lanzhou 730000,China;Qinghai University,Xining 810016,China;Key laboratory of Energy-saving Materials of Building and Engineering Safety of Qinghai,Xining 810016,China)
出处
《青海大学学报》
2020年第6期48-55,共8页
Journal of Qinghai University
基金
青海省“135”人才工程项目
青海省建筑节能材料与工程安全重点实验室
甘肃省发展改革委员会项目。
关键词
原位试验
泥质粉砂岩
抗剪断参数
最小二乘法
in-situ testing
pelitic siltstone
shearing parameter
least square method
作者简介
乔国锋(1970-),男,甘肃兰州人,高级工程师。研究方向:工程地质、水文地质。;通信作者:张文,E-mail:516061874@qq.com。
