多重因素影响下煤矿大巷稳定性支护策略研究

煤矿大巷作为煤矿运输的关键环节,在保证煤矿产量、确保煤矿安全等方面扮演着非常重要的作用,但是从当前煤矿大巷稳定性来看,所需的支护成本较高,受到的各种类型影响因素也相对较多,全面确保煤矿大巷稳定性对于保证煤矿正常运行非常关键。本文从当前煤矿大巷稳定性常见问题分析入手,研究了影响煤矿大巷稳定性的相关因素,并针对性提出了提升煤矿大巷稳定性的相关措施。

东曲煤矿西大巷高强稳定性支护技术研究

以东曲煤矿西大巷为例,来对巷道高强度稳定性支护的基本情况进行分析,采用先注后锚、先锚后注、锚杆(索)网补强等支护方案对巷道周边围岩进行加固,保证巷道长期安全使用。

控制爆破在井下信集闭硐室施工中的应用

介绍了采用控制爆破技术施工位于井底车场及主要运输大巷的信集闭硐窒。针对不同的地点采用不同的施工方法,取得了理想的爆破效果,为矿井类似复杂条件下的爆破施工提供了可借鉴的经验。

Characteristics of in situ stress field at Qingshui coal mine

In this study, the characteristics of geological structure at Qingshui coal mine were analyzed. And the hollow inclusion strain cell overcoring method was used to obtain the in situ stress. The effect of in situ stress on the stability of soft rock roadway was analyzed. The results show that the maximum principal stress is in the horizontal direction with a northeast orientation and has a value of about 1.2–1.9 times larger than gravity; the right side of roadway roof and floor is easily subject to serious deformation and failure, and the in situ stress is found to be a major factor. This paper presents important information for developing countermeasures against the large deformation of the soft rock roadway at Qingshui coal mine.

直墙拱形煤巷断面形状优化的围岩力学行为数值模拟

以寺家庄煤矿为例,通过理论建模对直墙拱形煤巷断面形状围岩的力学行为进行了数值模拟分析。研究表明不同矢跨比对大巷围岩力学行为影响明显,随着距帮部、顶板和底板距离的增大,主应力迅速增大,然后逐渐减小至趋于稳定;帮部位移量、顶板下沉量和底板底鼓量都是逐渐减小,直至趋于稳定;而在矢跨比为0.4时,无论是围岩应力还是位移量都较小,矢跨比0.4是圆弧拱大巷设计的最优选择。