【摘要】 首先提出采用区间值表示岩体力学参数取值,以反映参数取值的不确定性特征,并根据参数取值特性建立出相应参数的区间值确定方法;其次,综合考虑地下硐室地质条件及其裂隙较多的特点,采用适合于裂隙岩体稳定性分析的块体理论,在研究围岩稳定性进行分析的基础之上建立地下硐室节理岩体的区间非概率可靠性分析模型;然后,运用区间理论与一维优化算法求解非概率可靠性指标,并采用可靠性评价准则对地下硐室岩体稳定性进行综合评价。由于需考虑的裂隙多而导致计算量较大,因此分析方法采用了可实现程序化的矢量分析法,应用数值软件MATLAB编制计算程序。该程序通过输入结构面产状,力学参数等工程数据,依次分析各关键块体,得到滑动方向、区间可靠度等相关信息,从而为地下硐室群的开挖施工提供指导。更多还原

【Abstract】 Firstly,the interval values are presented to denote the mechanical parameters of rock mass,which can reflect the uncertain character during determining the parameters.The determining methods are also proposed according to the character of the parameters.Secondly,according to the engineering geological condition and characteristics of plenty of fractures,the block theory is adopted to analyze stability of surrounding rock mass of underground caverns,and an interval non-probabilistic reliability model of surrounding jointed rock mass of underground caverns is also developed based on the stability analysis.Thirdly,the solution of non-probabilistic reliability indexes is performed by means of the interval theory and the one-dimensional optimization algorithm.The synthetic evaluation is carried out through the established reliability evaluation rules.According to the elements of vector analysis method,the numerical software MATLAB is employed to compile the program applicable to underground caverns.The program needs to input joints,measuring point direction,mechanical parameters,vertical wall height of underground caverns and other relevant engineering data,to search existing unstable rock blocks in ranges of underground caverns and to analyze boundary conditions,geometric parameters,failure modes and interval non-probabilistic reliability of each block in turn.Accordingly,sliding direction,non-probabilistic reliability and other relevant information of the key block are obtained.The information will provide guidance for excavation of underground caverns.更多还原