地下水封储油库围岩稳定性数值分析

辽宁某地下水封储油硐库地应力水平不高，属于低应力区，开挖后围岩变形破坏受单一结构面和多组结构面的组合控制，因此首先需要分析围岩属于应力型问题还是属于结构面型问题，其重要性等同于围岩参数取值的重要性。Hoek和Brown提出的地质强度指标（GSI）法基于岩体质量评价，应用经验公式确定岩体力学参数，可以一定程度上减少确定抗剪强度指标过程中的主观成分。以辽宁某地下水封储油库工程储油硐室为研究对象，采用基于GSI系统的围岩参数取值方法，借助FLAC3D软件对围岩稳定性进行数值分析，利用位移判据和应力判据对数值分析结果进行解释，进而判断围岩的稳定性，对工程实践具有一定的指导意义。（表1，图11，参9）

Numerical analysis on the stability of surrounding rock for underground water-sealing oil storage in rock caverns

An underground water-sealing oil storage in rock caverns in Liaoning Province follows a low level of ground stress in the low-stress area. After its excavation, surrounding rock deformation and fracture are controlled under the combination between single structure plane and multi-group structure plane. Therefore, it is required to first analyze whether the surrounding rock suffer stress problems or structure plane problems and equivalent to value selection of surrounding rock parameters on the importance. Geological strength index （GSI） proposed by Hoek and Brown are based on rock quality evaluation. It can reduce subjectivity in determining the shear strength indicator to define rock mass mechanics parameters by the empirical formula, The underground water-sealed oil storage in rock caverns in Liaoning Province is taken as the object of study. Using the surrounding rock parameter value selection method based on GSI system as well as FLAC3D software, numerical analysis on the surrounding rock stability is conducted and its results are interpreted based on displacement criteria and stress criterion to determine the surrounding rock stability, thus having a guiding significance in engineering practice. （1 Table, 11 Figures, 9 References）