摘要
准确预测围岩变形是大型地下硐室科学设计与安全施工的重要前提之一。现有地下硐室围岩变形预测方法主要基于已施工部位围岩变形情况来预测未施工部位围岩的变形趋势,难以满足工程勘察设计阶段准确预测围岩整体变形的要求。在统计分析国内31例大型地下硐室实测资料的基础上,提出了一种适用于工程勘察设计阶段的大型地下厂房边墙最大收敛变形多指标预测方法。该方法分析了31例工程案例的实测数据,发现单轴饱和抗压强度与地应力的比值(强度应力比R/σ)、地质强度指标(GSI)和完整岩石的材料常数m_i对围岩变形影响较大,并给出了相应的计算方法,同时采用最大收敛变形与硐室高度比(相对变形值U/H)评价了围岩变形量值的大小。通过大量的统计分析建立了地下硐室相对变形值U/H与3个指标之间的预测公式。通过工程实例验证了所提大型地下厂房边墙最大收敛变形预测方法。结果表明,该预测方法的计算结果与实际结果非常接近,说明了所提方法的合理性。
Accurate prediction of surrounding rock deformation is one of the important prerequisites for scientific design and safe construction of large underground caverns. Existing prediction methods for surrounding rock deformation of underground cavern are mainly based on the monitoring data of the constructed locations surrounding rock deformation to predict the deformation trend of unconstructed locations. This causes difficulties in meeting the requirement of accurately predicting the total surrounding rock deformation of in engineering survey and design stage. Based on the statistical analysis of measured data from 31 large underground caverns in China, a method for predicting the maximum convergence deformation of underground powerhouse side wall based on multiple indexes was proposed. Firstly, it is found that the ratio of saturated uniaxial compressive strength to ground stress R/σ, geological strength index(GSI) and material constant of intact rock m_i have great influence on the surrounding rock deformation in the 31 cases. Their calculation methods are also given. Meantime, the ratio of maximum convergence deformation to cavern height(relative deformation value U/H) is used to evaluate the value of surrounding rock deformation. Secondly, through many statistical analyses, the prediction formula between the relative deformation value(U/H) of underground cavern and the three indexes is established. Finally, the method for predicting maximum convergence deformation of underground powerhouse side wall is verified by an engineering example. The results show that the calculated results by this method are very close to the actual results, which indicates the rationality of the proposed method.
作者
骆顺天
杨凡杰
周辉
张传庆
王旭宏
吕涛
朱勇
卢景景
LUO Shun-tian;YANG Fan-jie;ZHOU Hui;ZHANG Chuan-qing;WANG Xu-hong;Lü Tao;ZHU Yong;LU Jing-jing(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan,Hubei 430068,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第10期3415-3424,共10页
Rock and Soil Mechanics
基金
国家重点研发计划项目(No.2019YFC0605103,No.2019YFC0605104,No.2019YFC0605100)
国家自然科学基金-雅砻江联合基金重点项目(No.U1865203)。
关键词
岩土工程
大型地下硐室
地下厂房边墙
最大收敛变形
统计分析
预测方法
geotechnical engineering
large underground cavern
side wall of underground powerhouse
maximum convergence deformation
statistical analysis
prediction method
