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.
作者
王凯
杨宝贵
王鹏宇
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)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
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)。
关键词
软弱厚煤层
沿空留巷
巷旁支护
协同变形
soft and thick coal seam
gob-side entry retaining
roadway side support
coordinated deformation
