摘要
为了解决采空区大面积冒落所产生空气冲击波的问题,以冬瓜山铜矿西山特大采空区为例,建立了简化的物理模型,采用Lagrange法,从理论上计算采空区顶板大面积冒落所产生空气冲击波的强度;同时,采用激波管实验,研究垫层的削波效果.理论计算结果表明:西山采空区顶板大面积冒落不会产生空气冲击波,只会形成高速气浪,垫层表面最大风压为0.139 MPa,最大风速为53.09 m/s,接近自由落体的速度.激波管实验表明:当垫层厚度不小于12 m时,出口风速和风压可降到安全范围内.
In order to solve the problem of air shock wave induced by the potential falling roof in a large scale in the ultra-huge mined area, taking the ultra-huge mined areas of Xishan section in Dongguashan Cooper Mine as example,a simplified physical model was built, and the intensity of air shock wave was calculated theoretically by the Lagrange method, meanwhile the weakening effect of ore cushion was tested by shock wave tube test. The results show that there is not air shock wave but airflow with high velocity during the roof falling in Xishan mined area, which the maximum wind pressure was 0. 139 MPa and the maximum wind speed was 53.09 m/s on the surface of ore cushion according to the free fall law. The wind velocity and pressure in the outlet would fade down to the safety range on the condition that the thickness of ore cushion is more than 12 m.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2007年第4期473-477,共5页
Journal of China University of Mining & Technology
基金
国家"十五"科技攻关项目(2004BA615A-04)
国家杰出青年基金项目(50325415)
国家自然科学基金项目(50574099)
关键词
特大空区
顶板冒落
空气冲击波
垫层厚度
ultra-huge mined-area
roof fall
air shock wave
thickness of ore cushion
