地下水封石油洞库洞轴走向的数值分析

摘要

由于深埋地下洞室的高地应力对洞室稳定性有很大影响,对于大断面地下水封石油洞库来说洞室的断面形状、高跨比、埋深和间距确定以后,就应该分析洞室的洞轴走向与最大地应力的最优夹角问题.在数值模拟中采用Hoek-Brown准则将岩石的物理参数转化为岩体的物理参数,同时采用相应公式将地勘报告中的的地应力转为软件坐标系认可的地应力.模拟中采用洞轴与最大主应力方向平行和10°夹角的两种方案,通过比较开挖后的位移和最大主应力来分析得到最合理的洞室洞轴走向与地应力方向之间夹角.%The high ground stress have great influence on the stability of the caverns.After analyzing the cross-section shape,height-span ratio,depth and spacing of the underground water seal oil caverns,the cavity hole axis and the direction of the maximum stress of the optimum angle problem were analyzed in this paper.The physical parameters of rocks are transformed into physical parameters of rock mass by using HOEK-BROWN criterion.According to the corresponding formula,the in-situ stress in geological prospecting report is converted which can be recognized by the software coordinate system.Two schemes of parallel and 10° degree angle between the hole axis and the maximum principal stress direction have been used in the simulation.By comparing the displacement and maximum principal stress after excavation,the most reasonable angle between the axis of the tunnel and the ground stress is obtained.