托顶煤巷道易片冒顶板变形机理与超前导管预注浆控制技术研究OA北大核心CSTPCD
Study on the deformation mechanism of prone to caving roof in roadways with top coal and the control technology of advanced pipe pre-grouting
目的 为探究厚煤层易片冒区域托顶煤巷道顶板变形破坏机理,并对易片冒区托顶煤巷道顶板进行有效控制,方法 以常村煤矿2701工作面皮带运输巷为例,通过等截面梁理论分析托顶煤巷道顶板破断成因,研究托顶煤巷道顶板的稳定性与巷道宽度和顶煤强度的关系.通过极限平衡准则得到巷帮位移的计算公式,证明托顶煤巷道具有帮顶协同变形机制.建立托顶煤巷道数值模型,研究巷道埋深、侧压系数、顶煤厚度和顶煤强度与托顶煤巷道围岩稳定性的关系.结果 结果表明:巷道埋深越大,其对托顶煤巷道两帮稳定性的影响越大;侧压系数的增加对巷道两帮和底鼓量的影响更大,对顶板影响较小;顶板下沉量与顶煤厚度呈正相关,底鼓量则与顶煤厚度呈负相关;顶煤强度的增加使巷道顶板下沉量与两帮移近量均近似呈线性减小趋势,底鼓量基本保持不变.结论 通过幂律型流体柱形渗透注浆扩散理论得到超前导管注浆半径,由此提出托顶煤巷道超前导管预注浆帮顶联合控制技术,成功控制易片冒托顶煤巷道顶板冒落问题,可为类似地质条件的托顶煤巷道顶板控制提供借鉴.
Objectives To explore the deformation and failure mechanism of the roof of the roadway with top coal in thick coal seams in areas prone to caving,and to control the roof of the roadway with top coal in such areas,Methods The belt roadway of the 2701 working face of Changcun Coal Mine was taken as an example,the cause of the roof fracture of the roadway with top coal was analyzed through the theory of uni-form beam.The conclusion was that the stability of the roof of the roadway with top coal was closely related to the width of the roadway and the strength of the top coal.The calculation formula for the displacement of the roadway side was obtained through the limit equilibrium criterion,proving that the roof and sides of the roadway with top coal had a synergistic deformation mechanism.By establishing a numerical model for the roadway with top coal,the relationship between the stability of the surrounding rock of the roadway with top coal and different roadway burial depths,lateral pressure coefficients,top coal thickness,and top coal strength was studied.Results The research results indicated that the greater the burial depth of the roadway was,the greater the impact on the stability of the two sides of the roadway with top coal was.The increase in the lateral pressure coefficient had a greater impact on the two sides of the roadway and the amount of floor heave,but had a smaller impact on the roof.The amount of roof subsidence was positively correlated with the thickness of the top coal,while the amount of floor heave was negatively correlated with the thickness of the top coal.The increase in the strength of the top coal caused a linear decrease in the subsidence of the roadway roof and the displacement of the two sides,while the amount of floor heave remained basically un-changed.Conclusions Based on the power-law cement grouts column seepage grouting diffusion theory,the advanced duct grouting radius was obtained,and the combined control technology of advance pipe pre-grouting and roof support for the roadway with top coal was proposed.The roof caving of roadways with top coal prone to slicing caving was successfully controlled,providing a reference for roof control of roadways with top coal under similar geological conditions.
陈晓祥;韩文宇
河南理工大学 能源科学与工程学院,河南 焦作 454000||煤炭安全生产与清洁高效利用省部共建协同创新中心,河南 焦作 454000河南理工大学 能源科学与工程学院,河南 焦作 454000
矿山工程
厚煤层托顶煤巷道顶板破断机理超前导管注浆帮顶联合控制技术
thick coal seamroadway with top coalfracture mechanism of roofadvanced pipepre-groutingcombined control technology of roadway side and roof
《河南理工大学学报（自然科学版）》 2024 (004)
1-11 / 11
国家自然科学基金资助项目(U1504515,51304068);中国煤炭工业协会指导性研究计划项目(MTKJ2015-251);河南省高等学校青年骨干教师培养计划项目(2017GGJS055);河南省高校基本科研业务费专项项目(NSFRF140134)
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