采空区赋存状态对邻域边坡稳定性的影响分析

Analysis of the Influence of the Occurrence State of Goaf on the Stability of Adjacent Slope

为分析采空区赋存状态对边坡稳定性的影响,针对云南省镇雄县头屯村因煤矿地下采空区引起滑坡的实际案例,结合正交试验设计和MIDAS GTS/NX数值模型,基于敏感性分析思想,分析边坡应力场、位移场及其有效塑性区分布规律,研究采空区采深、采空区高度、采空区跨度和采空区距离边坡的水平距离4个因素3种水平的影响敏感性。研究表明:采空区采深因素是影响采空区稳定的重要因素,其次是采空区距边坡的水平距离、采空区跨度,影响最小的是采空区的高度因素。依据采空区形态及赋存状态要素的权重大小,利用多元线性回归方程,得出采空区对邻域边坡影响的极限状态方程,该研究成果可为矿山边坡稳定性分析及煤矿安全开采提供借鉴。

In order to analyze the influence of the occurrence state of the goaf on the slope stability,aiming at the actual case of landslide caused by the underground goaf in the coal mine in Toutun Village,Zhenxiong County,Yunnan Province,combined with the orthogonal experimental design and the MIDAS GTS/NX numerical model,Based on the idea of sensitivity analysis,analyze the stress field,displacement field and the distribution law of the effective plastic zone of the slope,study the sensitivity of the influence of 3 levels of 4 factors such as the mining depth factor of goaf,the height factor of the goaf,the span of the goaf and the horizontal distance from the goaf to the slope.The research shows that:the mining depth factor of goaf is an important factor affecting the stability of the goaf,followed by the horizontal distance from the goaf to the slope,the span of the goaf,and the height factor of the goaf is the least influential.According to the goaf shape and the weight of the existing state elements,using the multiple linear regression equation,the limit state equation of the goaf s influence on the neighboring slope is obtained.The research results can be used for the stability analysis of the similar goaf slope to provide reference.