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据洞室围岩破坏的非线性特点,考虑到储油洞室失稳破坏问题是一种突变问题,运用Hoek-Brown强度折减法及突变理论,得到了洞室围岩强度折减系数与突变特征值的关系,然后根据突变特征值给出了水封储油洞室围岩的稳定性安全系数,最终建立了基于HoekBrown强度折减法的水封储油洞室稳定性分析的突变模型,克服了Mohr-Coulomb强度折减法不能描述岩体非线性破坏特征,以及单纯使用强度折减法计算中不能精确量化失稳判别准则的缺点,提高了洞室安全系数模拟计算精度。将本文所建立模型的结果与已有模型的计算结果进行了对比,并利用上述模型分析了洞室埋深、孔隙水压力、洞室间距和蠕变时间等因素对水封储油洞室稳定性的影响。计算结果表明:基于Hoek-Brown强度折减法建立的突变模型具有很好的实用性,可以满足实际工程计算精度要求;水封储油洞室的安全系数随着洞室埋深、孔隙压力、蠕变时间增加而降低,随着内洞室间距的增加而增加。
According to the nonlinear characteristics of the surrounding rock failure in the cavern, taking into account that the failure of the oil cavern is a catastrophe problem, Hoek-Brown strength reduction method and catastrophe theory are used to obtain the strength reduction coefficient and abrupt change of the cavern surrounding rock Then, according to the abrupt eigenvalue, the stability factor of the surrounding rock of water sealed oil storage caverns is given. Finally, a mutation model of stability analysis of water sealed oil caverns based on HoekBrown strength reduction method is established. The Mohr-Coulomb strength reduction method can not describe the non-linear failure characteristics of rock mass, and the shortcomings that the failure criterion can not be accurately quantified in the calculation of simply using the strength reduction method, so as to improve the calculation accuracy of cavern safety coefficient. The results of the model established in this paper are compared with those of the existing models. The above model is used to analyze the factors that affect the stability of the water sealed oil storage caverns, such as the depth of the cavern, pore water pressure, cavern spacing and creep time Sexual effects. The calculation results show that the abrupt model established based on the Hoek-Brown strength reduction method has good practicability and can meet the requirements of actual engineering calculation precision. The safety factor of water sealed oil storage cavern varies with the depth of burial chamber, pore pressure, Variable time increases and decreases, with the increase of the spacing of the inner chamber increases.