断层端部地应力分布规律影响因素的数值模拟

Numerical Simulation on Influence Factors of Ground Stress at the End of Fault

通过数值模拟软件RFPA对正断层端部地应力的分布情况进行模拟。分别模拟了埋深、破碎带宽度、关键层泊松比、关键层弹性模量4个参数对断层端部水平和垂直方向应力分布规律的影响。研究表明:上述因素均对断层端部应力有着不同程度的影响。其中关键层弹性模量对断层端部应力影响最为敏感,是断层端部应力分布集中程度的主要因素。通过该研究成果,利用RFPA软件可以对邻近断层开采区域内的断层端部应力分布情况进行预测和判断,有助于选择合理的支护方式、有助于断层防水煤柱的合理留设以及预防煤与瓦斯突出等事故的发生。

We simulated the distribution of ground stress at the ends of normal faults by numerical simulation software RFPA. The effect of depth,width of shattered zone,key layer Poisson＇s ratio and key layer elastic modulus on the distribution of horizontal and vertical stress at the end of fault is simulated. The stress effect of key layer elastic modulus on fault end is the most sensitive,which is the main factors of stress concentration distribution. Research shows that the factors listed above have different effects on the ends of the fault stress. Through the research results,the stress distribution at the end of fault in mining areas near fault can be predicted and judged by RFPA. It helps to choose a reasonable support pattern and retain the reasonable waterproof coal pillar and prevent the occurrence of coal and gas outburst accidents.