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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。
Firstly, the interval value is used to represent the mechanical parameters of rock mass in order to reflect the uncertainty characteristics of the parameter values. The method of determining the interval value of the corresponding parameters is established according to the parameter value characteristics. Secondly, considering the geological conditions of underground chambers and Based on the analysis of the stability of surrounding rock, an interval non-probabilistic reliability analysis model of jointed rock mass is established based on the block theory which is suitable for the stability analysis of fractured rock mass. Then, , The interval theory and one-dimensional optimization algorithm are used to solve the non-probabilistic reliability index, and the reliability assessment criteria are used to evaluate the stability of underground cavern rock mass. Due to the large number of fractures to be considered, which leads to a large amount of calculation, the analysis method uses a vector analysis method that can be programmed, and the calculation program is compiled by using numerical software MATLAB. By inputting engineering data such as structure and mechanical parameters of structural plane, the program analyzes each key block in turn, and obtains relevant information such as sliding direction and interval reliability, so as to provide guidance for excavation and construction of underground chamber group.