排序方式: 共有38条查询结果,搜索用时 31 毫秒
11.
本文采用正交试验法对光面爆破参数进行选优,并在王庄煤矿630南大巷进行了有效应用,取得了良好效果。 相似文献
12.
高冒空巷充填技术研究 总被引:1,自引:0,他引:1
黄汉富 《矿山压力与顶板管理》2005,22(2):59-60
介绍高水速凝材料充填综采放顶煤工作面前方的高冒空巷技术,通过理论分析和数值模拟计算,确定高冒空巷充填体的力学参数,并成功应用于工程实践。 相似文献
13.
14.
To prevent support crush, the overlying strata safe thickness and its influential elements were studied by the adoption of theoretical analysis, numerical simulation and in-situ measurement. According to the production and geological condition of first face in Sima coal mine, the results indicate that the clay contains large permissible bearing ability and has better arching force. After mining destruction, stable structure is formed in bedrock to ensure face safety. The clay thickness & bedrock thickness are the key influential elements to stable structure. The minimal bedrock thickness is about 40 m to ensure safe mining under loose surface soil condition. When surface soil contains mainly thick clay, it forms steady structure with the composition of thin bedrock, so that it can reduce minimal thickness of bedrock and to ensure safe mining. When clay thickness is 40 m, minimal bedrock thickness is 20 m. When clay thickness is 30 m, minimal bedrock thickness is 30 m. Bearing pressure peak ranges from 5 to 15 m in the front face under thin bedrock condition. The bearing pressure distribution range is 15 m. Main roof break distance is small, and initial weighting of main roof is not distinctive, while first periodic weighting of main roof is quite distinctive. 相似文献
15.
交岔点平面尺寸参数计算和作图方法的探讨潞安矿务局黄汉富矿井交岔点平面尺寸计算,在不少设计资料中已有计算公式,但这些计算公式计算数据多,作图比较复杂,工作量较大,在实际设计中尚需修改、以减少工程量,且现有公式都是假设交岔点的交角β大于或等于如图1中0T... 相似文献
16.
通过理论计算分析,提出综放沿底煤巷的大断面交岔点可采用锚梁网支护,并成功应用于王庄煤矿5201综放工作面底层煤巷交岔点,支护效果好。 相似文献
17.
三软煤层巷道锚杆支护技术 总被引:1,自引:0,他引:1
本文根据注浆加固原理和锚杆支护围岩强度强化理论,提出三软煤层巷道锚杆支护机理,介绍锚杆支护、小孔径预应力锚索加强支护技术和注浆加固技术,并将上述技术成功地应用到工程实践中. 相似文献
18.
结合司马煤矿因松散层底板隔水黏土层存在大量"漏洞"的实际条件,运用数值模拟等方法定义并圈定了薄基岩区;通过钻孔岩性组合分析,岩土及渗透力学取样测定,岩相古地理研究等对松散层形成条件及垂向导水性能进行了研究.结果表明:司马矿松散层上部赋存主要含水层,而其中下部以黏土为主;第四系沉积中心为古河口,其沉积物厚度大、颗粒细、含导水性差,河道两侧沉积物颗粒变粗、厚度变薄、垂向渗透能力增强,根据基岩古地形即可划分出松散层垂向越流能力的强弱区;古河口沉积覆盖了薄基岩区的大部分,有利于水、沙控制;底部自承力强的硬黏土减小了支架的附加载荷,开采实践检验了研究结论的正确性. 相似文献
19.
20.