【摘要】 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。更多还原

【Abstract】 The failure of water-sealed oil storage cavern can be seen as processes that the deformations of rock cavern convert from continuous gradual change system to catastrophe state,which are typically nonlinear catastrophe problems. Considering the nonlinear failure characteristic of rock,a catastrophe model is proposed to obtain the stability factors of rock cavern based on the Hoek-Brown strength reduction method and catastrophe theory. It can overcome the shortages of Mohr-Coulomb strength reduction method and traditional strength reduction finite element method,and improve the accuracy of stability factors obtained by numerical simulations. A comparison of this model with the result calculated by the existing computation example is made. In addition,the influences of cavern depth,cavern spacing,pore pressure,and creep time on the stability factors are studied. The results showed the model is precise and correct,and can meet the actual engineering demands. The stability factors are equidirectional with the increase of cavern spacing,but reverse to the increase of cavern depth,pore pressure and time.更多还原