摘要
基于高精度微地震监测技术,结合岩石力学理论、矿山压力理论和现场宏观现象,对特厚煤层综放工作面的岩层运动与支架载荷关系进行了研究。研究结果表明,正常情况下,特厚煤层综放工作面的基本载荷来源于厚度大于10 m的顶煤、厚度约30 m的下位直接顶和部分厚度为20 m左右的上位直接顶;冲击载荷来源于老顶的断裂冲击,老顶在工作面前方断裂并强迫其下位岩层断裂,从而在支架上形成冲击载荷,这也是特厚煤层综放工作面设计支架支撑能力13000 kN/架但被压死的主要原因。指出了特厚煤层综放工作面支架选型的方向是:支架的基本支撑能力能够承担顶煤和部分直接顶的作用力,通过缩小支架控顶距、加大支架可缩量等措施,可减小冲击对支架的影响。
Based on the high-precision micro-seismic monitoring technology,the theories of rock mechanics pressure and the field macro scenes,and the relations between stratum movement and support on the extra-thick fully mechanized top-coal caving face are studied.The results show that the basic load of the support includes such forces as the top coal more than 10 meters thick,the lower immediate roof about 30 meters thick and the upper immediate roof about 20 meters thick under normal circumstances.The main roof in front of the work face is forced to break the lower strata after its fracture and causes impact load on the support.It is the main reason that the design support capacity of 13000 kN / frame is crushed.Accordingly,the selection of the support of the fully mechanized top-coal caving face should consider the basic ability of the support,which can bear the forces from the top coal and the direct uplift.Some measures such as decrease of distance of support roof and increase of support extension should be taken so as to reduce the impact on the support.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第3期401-407,共7页
Chinese Journal of Geotechnical Engineering
基金
国家重大基础研究计划(973)项目(2010CB226803)
国家自然科学基金项目(40674017
50774012)
国家"十一五"科技支撑计划项目(2007BAK24B04)
关键词
高精度微地震监测技术
特厚煤层
综放开采
顶板结构
支架围岩关系
high precision microseismic monitoring technology
extra-thick coal seam
fully mechanized sublevel caving mining
roof structure
relationship between support and strata
