China Coal Energy Research Institute Co. , Ltd.
China Coal Rock Burst and Water Hazard Control Center
Hulusu Coal Mine, Zhongtian Hechuang Energy Co. , Ltd.
Menkeqing Coal Mine, Zhongtian Hechuang Energy Co. , Ltd.

保护层开采是防治煤矿冲击地压灾害的有效手段,被保护层内工作面的位置对于保护层的防冲效果至关重要。针对冲击地压矿井被保护层工作面位置的量化确定问题,以葫芦素煤矿近距离煤层为研究背景,建立了半无限平面体受垂向载荷模型,理论分析了被保护层煤体高应力区分布特征,将被保护层工作面的布置方案问题简化为工作面最佳水平错距的选择问题,提出了基于层次分析思想的最佳水平错距优选方法,即:构建最佳水平错距的AHP结构模型,求解各因子层相对于目标层的权重矩阵,建立FLAC2D数值模型并求解水平错距取值范围,加权计算得到取值范围内的最佳水平错距。研究结果表明:①被保护层煤体存在一侧采空煤体区、两侧采空遗留煤柱区以及应力恢复区3处高应力区,以及2处呈对称分布的应力降低区;②对主要巷道掘进、维护及工作面回采有利的水平错距取值范围分别为50~75m、80~140m和40~100m;③基于AHP分析方法,确定对主要巷道的掘进、维护以及工作面回采综合有利的水平错距为60m。研究结果可为冲击地压矿井近距离煤层被保护层工作面的布置提供依据和方法。

Mining protective layers is an effective method to prevent coal mine rock burst disaster. The face location in protective layers is vital for rock burst prevention. Regarding to how to quantize the face locations of protective layers at rock burst mines, we take Hulusu Coal Mine as a research target. Set up semi-infinite plane vertical load model and analyze the distribution characteristics of high stress coal zones in protective layers. We simplify the face layout of protective layers into the selection of an optimal horizontal offset. Mathematically, create an optimal horizontal offset Analytic Hierarchy Process (AHP) structural model of optimal horizontal offsets, solve the weight matrix of each factor layer versus the target layer, establish the Fast Lagrangian Analysis of Continuum (FLAC2D) numerical model and define the value range of the horizontal offsets, and obtain the optimal horizontal offset within the value by weighted calculation. The research results show that: There are three high stress areas in the coal body of the protected layer, including one side of the goaf, two sides of the goaf coal pillar area and the stress recovery area, and two stress reduction areas in symmetrical distribution; The range of horizontal offsets favorable for main roadway excavation, maintenance and face recovery is 50~75 m, 80~140 m and 40~ 100 m respectively; Based on the AHP method, the optimal horizontal offset for excavation, maintenance and recovery in main roadways is L = 60 m.The research results can provide a reference for the face layout of the protective layers under similar conditions.

解嘉豪,韩刚,姚锐,等.冲击地压矿井近距离煤层被保护层工作面布置方法研究[J].煤炭工程,2024,56(7):14-21.