孤岛煤柱影响下巷道围岩非对称性变形机制研究

doi:10.13722/j.cnki.jrme.2019.0934

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摘要通过现场监测与理论分析手段，揭示山西某矿1021巷在10#煤层孤岛煤柱影响下的非对称变形机制，并提出合理的巷道支护建议。研究结果表明：孤岛煤柱支承压力在底板引起了一定的应力变化，导致1021巷所受主应力与水平方向呈19°夹角，最大主应力来自于孤岛煤柱方向，最小主应力来自于巷道上方采空区方向，主应力的偏转导致巷道围岩塑性区呈“对角式”发育，巷道呈现非对称破坏；巷道顶梁最大弯矩位置随载荷非对称系数λ的增大，逐渐靠近距孤岛煤柱较近一侧巷帮，弯矩最大值Mmax随λ增大呈线性增大，立柱支护应采用非对称形式；巷道底鼓类型属于复合型底鼓，直接底为挠曲褶皱性底鼓，其最大底鼓量位置随非对称系数λ变化而产生偏移，当λ=2时呈现为对称性，基本底为挤压流动性底鼓，其底板位移速度在远离孤岛煤柱的过程中不断增大，速度与水平方向夹角也不断增大，导致底鼓呈现非对称性；最后根据1021巷围岩变形特点，提出了顶底板非对称支护建议。

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	赵洪宝
	程辉
	李金雨
	王涛
	刘一洪
	秦逢缘

关键词 ：采矿工程, 非对称变形, “对角式”塑性区, 最大弯矩, 复合型底鼓, 非对称支护

Abstract：By means of on-site monitoring and theoretical analysis，this paper reveals the asymmetric deformation mechanism of 1021 roadway which is under the influence of isolated island coal pillar in #10 coal seam in Shanxi Province. And a reasonable roadway support is put forward. The results show that：The abutment pressure of isolated coal pillar will cause stress changes in the floor. The angle between the principal stress and the horizontal direction of 1021 roadway is 19°. The maximum principal stress comes from the direction of isolated coal pillar and the minimum principal stress comes from the direction of goaf above the roadway. The deflection of the principal stress leads to the development of the plastic zone of the roadway surrounding rock in a diagonal pattern，and the roadway presents asymmetric damage. The position of the maximum bending moment of the roadway top beam increases with the asymmetric coefficient λ of the load. And the position will gradually approach the side of the roadway near the isolated coal pillar. The maximum bending moment increases linearly with the increase of λ. The column support should adopt the asymmetric form. The floor heave type of roadway belongs to compound floor heave. The roadway direct floor is flexure fold floor heave. The position of the maximum floor heave is shifted with the change of asymmetric coefficient λ. When λ = 2，it is symmetrical. The basic floor is an extrusion flow floor heave. The displacement velocity of the floor plate increases continuously in the process of being far away from the isolated island coal pillar，the angle between the velocity and the horizontal direction also increases. It leads to the asymmetry of floor heave. Finally，according to the deformation characteristics of 1021 roadway surrounding rock，the paper puts forward the asymmetric support suggestions of roof and floor.

Key words： mining engineering asymmetric deformation diagonal plastic zone maximum bending moment compound floor heave asymmetric support

引用本文:

赵洪宝，程辉，李金雨，王涛，刘一洪，秦逢缘. 孤岛煤柱影响下巷道围岩非对称性变形机制研究[J]. 岩石力学与工程学报, 2020, 39(S1): 2771-2784.
ZHAO Hongbao，CHENG Hui，LI Jinyu，WANG Tao，LIU Yihong，QIN Fengyuan. Study on asymmetric deformation mechanism of surrounding rock of roadway under the effect of isolated coal pillar. , 2020, 39(S1): 2771-2784.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0934 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/2771

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