基于承压板试验的岩体蠕变参数反演统一解析公式法  

Unified analytical formula method for inversion of creep parameters of rock based on bearing plate test

作　　者：杨文东[1,2] 张强勇[2] 陈芳[2] 李文纲[3] 王建洪[3] 贺如平[3] 曾纪全[3] 

机构地区：[1]中国石油大学储运与建筑工程学院,青岛266555 [2]山东大学岩土与结构工程研究中心,济南250061 [3]中国水电顾问集团成都勘测设计研究院,成都610072

出　　处：《岩土力学》2012年第2期367-374,共8页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划资助(No.2009CB724607);国家自然科学基金项目资助(No.41172268);教育部新世纪优秀人才支持计划资助(No.NCET-08-0336);中央高校基本科研业务费专项资金(No.11CX04051A)

摘　　要：由于岩体性状的复杂性和多样性,现场试验是进行岩石力学研究的重要手段。以往的现场承压板试验,由于试验条件的限制,试验荷载的设定将使岩体蠕变呈衰减蠕变形态,却难以反映岩体的等速蠕变和加速蠕变。坝基软弱岩体的力学特性是影响大坝及地下结构长期稳定性的重要因素。通过对坝基软弱岩体现场承压板试验曲线中表现出的衰减蠕变和等速蠕变两阶段特性,辨识了蠕变模型。并推导了刚、柔性承压板深部岩体的黏弹性一般解,给出了Maxwell模型、广义Kelvin模型、Burgers模型的黏弹性位移的统一表达式。结合试验数据,以理论解析反演法得到相关的蠕变参数,为以后的坝基长期稳定性计算奠定基础。On-site experiments are crucial to study rock mechanics due to the complexity and diversity of rock mass.In the past,test conditions restrain the test load setting of rock creep to transient creep,thus it cannot reflect steady-state creep and accelerated creep.The mechanical characteristics of weak rock mass are vital factors which affect the long-term stability of a dam and its underground structure.The creep model which is identified through the two stage characters of transient creep and steady-state creep is presented in the test curve of the bearing plate in dam foundation.Viscoelastic general solutions of deep rock rigid and flexible bearing plate are deduced by applying viscoelastic theory,and uniform expression of Maxwell modal,generalized Kelvin and Burgers model are also given.The rheological parameters obtained through the combination of theoretically analytic inversion and the experiment data form the basis for analyzing long-term stability of dam foundations.

关 键 词：长期稳定性 承压板试验 压缩蠕变 流变参数 坝基软弱岩体 

分 类 号：TU45[建筑科学—岩土工程]