积水采空区下淋水顶板巷道失稳机理研究_中国煤炭行业知识服务平台

积水采空区下淋水顶板巷道失稳机理研究

Title

Study on instability mechanism of roadway under water-sprinkling roof in water-storage goaf
作者

郭亚欣宋选民
Author

GUO Yaxin,SONG Xuanmin
单位

太原理工大学采矿工艺研究所太原理工大学原位改性采矿教育部重点实验室
Organization

1.Institute of Mining Technology, Taiyuan University of Technology, Taiyuan ,China； 2.Key Laboratory of In-situ Property-improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan ，China
摘要

为研究黑龙矿积水采空区下淋水顶板巷道失稳机理，以黑龙矿2104工作面运输巷为研究背景，通过现场实测、矿物成分与水质分析、围岩崩解和力学特性测试，以及FLAC^3D数值模拟等研究方法，对2104运输巷淋水顶板巷道失稳特征与机理展开研究。研究结果表明：积水采空区下淋水顶板巷道失稳受多重因素影响：①2104工作面运输巷顶板是黏土矿物发育的软岩，其中膨胀性软岩高岭石占岩石总成分的23.2%～32.2%，围岩强度较低；②由于偏酸性矿井水与顶板岩体矿物成分相互作用，顶板岩体矿物组分和微观结构发生改变，横向与纵向裂隙大量增加，岩体泥化和弱化现象明显，围岩的单轴抗压强度下降35%～38%，抗拉强度下降24.5%～42.0%，黏聚力下降17.5%～55.9%，内摩擦角减小7.9%～12.3%，弹性模量下降19.6%～43.4%，泊松比增加10%～16.7%；③掘进期间巷道受采掘扰动影响，导致应力集中，塑性区破坏范围增大21.4%～90.0%，巷道变形量增加16.6%～65.6%,巷道稳定性差；④回采期间巷道顶板受反复浸水和风化作用，围岩裂隙发育，巷道失稳加剧。
Abstract

In order to study the instability mechanism of roof roadway under the sprinkling roof in water-storage area, the transportation roadway in No.2104 working face of Heilong Mine was taken as the research background, through field measure, mineral composition and water quality analysis, rib rock disintegration and mechanical property test, FLAC3D numerical simulation and other research methods were used to study the instability characteristics and mechanism roof of No.2104 transport roadway. The results showed that the instability of the roof roadway under the water-storage area was affected by multiple factors: ① The roof of the roadway was soft rock developed by clay minerals, and the expansive soft rock Kaolinite accounted for 23.2%～32.2% of the total rock composition, and the surrounding rock strength was low; ② Due to interaction between the acidic mine water and the mineral composition of roof rock mass, the mineral composition and microstructure of roof rock mass change, the lateral and longitudinal cracks increased greatly, and the rock mass was muddy weakened. The uniaxial compressive strength of the surrounding rock decreased by 35%～38%, the tensile strength decreased by 24.5%～53.7%, the cohesion decreased by 24.1%～44.7%, and the internal friction angle decreased by 7.9%～12.3%. The modulus decreased by 19.6%～43.4%, and the Poisson's Ratio increased by 10.0%～16.7%. ③ During the process of excavation, the roadway was affected by the mining disturbance, the stress concentration, and the plastic zone damage range increased by 21.4%～90.0%, and the roadway deformation increased by 16.6% ～65.6%, the stability of the roadway was poor; ④During the mining, the roof of the roadway was subjected to repeated immersion and weathering, the cracks of the surrounding rock developed, and the instability of the roadway was intensified.
关键词

积水采空区淋水顶板失稳机理矿物成分微观结构
KeyWords

water-storage gob; water-sprinkling roof; mechnism of instability;mineral content;micro-structare
基金项目(Foundation)

国家自然科学基金资助项目(51674173)；山西省回国留学人员科研资助项目(2016-040)；山西省自然科学基金基金面上资助项目(201601D102038)
图表
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