爆破振动对地表残余变形及建筑物影响研究——以云盖山煤矿二矿为例

Study on effects of blasting vibration on surface residual deformation and structures-- Taking Yungaishan coal mine 2 as an example

为研究爆破振动对老采空区上方地表残余变形及建筑物的影响,以云盖山煤矿二矿猴车巷掘进爆破为例,采用经验公式计算爆破安全允许距离,并建立ANSYS-LS-DYNA数值模型。引入爆破振动下残余下沉系数概念。用概率积分法,分析地表残余变形。结果表明,爆破安全允许距离的经验公式计算结果与数值模拟结果基本吻合。猴车巷的爆破活动影响了老采空区的稳定性,使地表残余变形加速。

To study effects of blasting vibration on surface residual deformation and structures over the old gob,Houche roadway blasting in Yungaishan coal mine 2 was taken as an example. Using an empirical formula,the safe distance of blasting vibration was obtained. An ANSYS-LS-DYNA numerical model was built to analyze the stability of old gob under the influence of blasting vibration,and a concept of residual subsidence coefficient under influence of blasting vibration was introduced. Characteristics of surface residual movement and deformation under the influence of blasting vibration were analyzed by using the probability integral method. The results show that the safe distance of blasting vibration calculated by empirical formula is consistent with the numerical simulation. The Houche roadway blasting affects the stability of the old gob and accelerates the surface residual deformation.