基于UDEC数值模拟的滑动型地裂缝发育规律

为了研究西部黄土沟壑矿区煤炭资源开采引起的滑动型地裂缝发育规律，首先给出了滑动型地裂缝的定义和基本特征，提出了滑动型裂缝距和裂缝角的概念；采用UDEC数值模拟软件，分别建立了滑动型地裂缝动态发育模型、沟谷坡度模型、沟谷位置模型，分析了开采引起滑动型裂缝的动态发育规律，研究了滑动型地裂缝发育位置与沟谷之间的关系，并以大柳塔煤矿52304工作面为例，验证了模型的可靠性。研究表明：① 滑动型地裂缝的发育分为累积期、形成期、动态发展期、稳定期4个阶段；② 滑动型地裂缝发育位置与沟谷之间的关系模型为：滑动型裂缝角与沟谷坡度之间存在二次多项式关系，与沟谷位置之间存在线性关系；③ 工程实例表明，裂缝角的计算值与实测值之间的最大相对误差为3.4%，使用该模型进行滑动型地裂缝发育位置进行预测是可行的。

Developing law of sliding ground fissures based on numerical simulation using UDEC

In order to study the developing law of sliding ground fissures caused by underground mining in the western loess hilly mining area of China,the definition and basic features of sliding ground fissures were given firstly in this paper.The dynamic developing model,gully gradient model,and gully position model were established using the UDEC numerical simulation software.Then,the dynamic developing law of sliding ground fissures was analyzed,the relationship between sliding ground fissures and gully was studied,and the reliability of models was validated through the engineering example at the 52304 working face in Daliuta Coal Mine,China.The results show that:① The development of sliding ground fissures could be divided into four periods,such as the accumulation period,the formation period,the dynamic developing period,and the stabilization period.② The relationship between sliding fissure angle and gully gradient was the quadratic polynomial equation,and the relationship between sliding fissure angle and gully position was the linear equation.③ The engineering example showed that the maximum relative error between the calculated values and the measured values of sliding ground fusser angle is 3.4%,which proves the prediction on the position of sliding ground fissure using this model is feasible.