摘要
井工煤矿开采过程中有时面临原有巷道断面尺寸不能满足正常生产而需要扩帮的情况,针对扩帮增跨存在巷道围岩稳定性降低、扩帮施工工艺及支护设计等问题,以汇兴煤矿5-2煤层北翼盘区带式输送机巷赋存情况和现有支护条件为背景,采用理论分析和数值模拟相结合的方法,研究了扩帮段围岩安全稳定性和顶板极限跨距,论证了北翼盘区带式输送机巷扩帮增跨可行性;对比分析了扩帮前后围岩应力演化规律、塑性区发育特征和护巷煤柱安全稳定性,并结合巷道支护极限自稳平衡拱理论得出北翼盘区带式输送机巷扩帮前后两帮破坏深度基本不变,扩帮后顶板破坏高度和极限平衡拱高度分别增加了13.1%和10.9%。基于此,确定了扩帮段支护参数,提出了“扩帮前顶板补打锚索、扩帮时及时支护新掘顶板及扩帮侧帮部”的施工工艺。最后,进行了扩帮施工及支护现场应用研究。结果表明,扩帮段围岩内部未见明显裂隙,围岩表面未出现明显片帮和移动变形,巷道整体安全稳定。
In the process of underground coal mining,it happens that the original roadway section doesn't meet the normal production and needs to be expanded.In order to solve the problems of declining stability of roadway wall rock,inadequate construction technology and supporting design due to expansion,in terms of the occurrence of belt conveyor roadway and the ongoing support conditions in the north wing panel of No.5-2 coal seam at Huixing Coal Mine as an example,the safety and stability of surrounding rock and the limit span of roof were studied by combining theoretical analysis with numerical simulation,and the feasibility of expanding the slope and increasing the width of belt conveyor roadway in the north wing panel was demonstrated.The stress evolution law of surrounding rock,the development characteristics of plastic zone and the safety and stability of roadway coal pillars before and after slope expansion were compared and analyzed.Combining with the limit self-stable equilibrium arch theory of roadway support,it was concluded that the failure depth of the two sides before and after the expansion of the belt conveyor roadway in the north wing panel is basically unchanged,and the roof failure height and the limit equilibrium arch height after the expansion are increased by 13.1%and 10.9%,respectively.On this basis,the support parameters of the expansion section were determined,and the expansion construction technology of“reinforcing the anchor cable in the roof before the expansion,supporting the new excavation roof and the expansion side in time during the expansion”was proposed.Finally,the expansion construction and support field application research were carried out.The results showed that there was neither obvious fissures in the surrounding rock of the expansion section,nor obvious spalling or moving deformation on the surface of the surrounding rock.The roadway was safe and stable.
作者
高亮
杜君武
王琳
GAO Liang;DU Junwu;WANG Lin(Shaanxi Coal Group Shenmu Ningtiaota Mining Co.,Ltd.,Yulin 719300,China;School of Energy Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2024年第9期56-64,共9页
Coal Engineering
基金
国家自然科学基金项目(52204154)
陕西省自然科学基础研究计划项目(2022JM-300)。
关键词
煤层巷道
扩帮增跨
数值模拟
围岩稳定性
支护设计
施工工艺
coal roadway
span enlarging
numerical simulation
stability of surrounding rock
support design
construction technics
