软弱厚煤层沿空留巷变形破坏特征及控制研究  

Deformation and failure characteristics of gob-side entry retaining in soft and thick coal seam and the control technology

作　　者：王凯[1,2] 杨宝贵 王鹏宇[2] 李冲 WANG Kai;YANG Bao-gui;WANG Peng-yu;LI Chong(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Gu-cheng Coal Mine of Shanxi Lu’an Mining Group,Changzhi,Shanxi 046100,China;School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]山西潞安矿业(集团)有限责任公司古城煤矿,山西长治046100 [3]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《岩土力学》2022年第7期1913-1924,1960,共13页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.51874277)。

摘　　要：针对软弱厚煤层综放开采沿空留巷动压显现明显,顶板易出现不均匀切顶下沉等问题。通过现场调研、理论分析和数值模拟,阐明了软弱厚煤层综放开采沿空留巷动压显现特征和变形机制,提出了软弱厚煤层沿煤层顶板布置沿空留巷变形协同支护体系。研究结果表明:综放开采采出厚度大,沿煤层底板留巷时沿空留巷煤层顶板承载能力差,“底板-巷旁支护体-顶板”支护体系载能力不协调,是造成软弱厚煤层沿空留巷产生大变形的主要原因;沿煤层顶板留巷变形协同支护体系的提出提高了沿空留巷帮部、顶底板及巷旁支护体的协同承载能力,可有效地保证软弱厚煤层沿空留巷的围岩稳定。研究成果在古城煤矿的成功应用,证明了该支护体系在软弱厚煤层综放沿空留巷中的可行性。In order to solve the problems of the obvious dynamic pressure, roof cutting subsidence and large deformation of the gob-side entry retaining in soft and thick coal seam fully-mechanized top-coal caving mining. The dynamic pressure characteristics and deformation mechanism of gob-side entry retaining are clarified, through field investigation, theoretical analysis and numerical simulation. A deformation coordinated support system of gob-side entry retaining arranged along the roof of soft and thick coal seam is proposed. The results show that the mining thickness of fully-mechanized top-coal caving mining is large, when retaining the gob-side entry along the coal seam floor, the bearing capacity of the coal roof is poor and the bearing capacity between the floor, gob-side entry filling body and roof support system is uncoordinated, which are the main reasons for the obvious dynamic pressure and large deformation of the gob-side entry retaining in the soft and thick coal seam. The proposal of the deformation coordinated support system in gob-side entry retaining along coal seam roof improves the coordinated bearing capacity of the coal wall, roof, floor and gob-side entry filling body, which can effectively ensure the stability of surrounding rock in the soft and thick coal seam gob-side entry retaining. The successful application of the research results to Gu-cheng Coal Mine proves the feasibility of the support system in soft and thick coal seam fully-mechanized coal caving mining gob-side entry retaining.

关 键 词：软弱厚煤层 沿空留巷 巷旁支护 协同变形 

分 类 号：TD353.6[矿业工程—矿井建设]