1. 中国矿业大学(北京)能源与矿业学院
2. 巷道支护与灾害防治煤炭行业工程研究中心
网络首发:2024-01-10,
纸质出版:2024
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刘洪涛, 韩子俊, 刘勤裕, 等. 巷道蝶形破坏强度准则低敏感性研究及工程应用[J]. 岩土力学, 2024,45(1):117-130.
刘洪涛, 韩子俊, 刘勤裕, et al. 巷道蝶形破坏强度准则低敏感性研究及工程应用[J]. 2024, 45(1): 117-130.
刘洪涛, 韩子俊, 刘勤裕, 等. 巷道蝶形破坏强度准则低敏感性研究及工程应用[J]. 岩土力学, 2024,45(1):117-130. DOI: 10.16285/j.rsm.2023.0107.
刘洪涛, 韩子俊, 刘勤裕, et al. 巷道蝶形破坏强度准则低敏感性研究及工程应用[J]. 2024, 45(1): 117-130. DOI: 10.16285/j.rsm.2023.0107.
巷道围岩的塑性区形态对巷道的破坏形式及破坏程度有重要影响。为探究三向应力场下塑性区形态演化过程,基于弹性力学推导了轴向应力表达式,并依据蝶形塑性区边界方程求解思路,确定了三维强度准则下三向塑性区近似解的求解方法。通过等球应力p、等偏应力q以及不同Lode角θ
σ
来确定围岩应力加载方案,对不同三维强度准则下的围岩塑性区形态演化规律进行深入研究,论证了蝶形破坏的准则低敏感性。基于蝶形破坏理论对羊场湾160206回风巷道的非对称变形破坏机制及控制技术进行深入分析。研究结果表明:(1)在相同p、q及不同θ
σ
的应力加载条件下,5种强度准则下的塑性区形态均呈现圆形、类椭圆及蝶形的演化规律,且每种强度准则在相同θ
σ
的情况下围岩的塑性区形态基本一致。(2)相同应力大小、不同应力方向的加载方案下,围岩的塑性区形态大不相同。圆巷围岩的塑性区形态很大程度上由水平侧压比决定,轴向侧压对围岩的塑性区尺寸影响较大,对塑性区形态影响较小。(3)羊场湾160206回风巷道在叠加采动影响下顶板呈现非对称大变形破坏,基于蝶形塑性区支护思路,应用非对称锚杆索+超前单元支架+钻孔卸压的协同支护技术,取得了良好的支护效果。
The morphology of the plastic zone of roadwaysurrounding rock has an important influence on the failure mode and degree ofroadway. In order to explore the evolution of plastic zone morphology underthree-dimensional stress field
this paper derives the axial stress expressionbased on elastic mechanics
and determines the approximate solution method of3D plastic zone under 3D strength criterion according to the idea of solvingthe boundary equation of butterfly plastic zone. By determining the surroundingrock stress loading scheme through equal spherical stress and equal deviatoric stress with different Lode angles
the morphological evolution of the plastic zoneunder different 3D strength criteria is studied in depth
and the lowsensitivity of the criterion for butterfly failure is demonstrated. Based onthe butterfly failure theory
the asymmetric deformation failure mechanism andcontrol technology of 160206 return roadway in Yangchangwan are analyzed. Theresults show that: 1) Under the same
and different stress loadingconditions
the morphology of the plastic zone under the five strength criteriashows the evolution patterns of round
oval and butterfly shapes
and themorphology of the plastic zone of surrounding rock is basically consistent foreach strength criterion under the same . 2) Under the loading scheme with same stress stateand different stress directions
the plastic zone morphology of surroundingrock varies greatly. The shape of the plastic zone is largely determined by thehorizontal lateral pressure ratio. The axial lateral pressure has a greaterinfluence on the size of the plastic zone
but less influence on the shape ofthe plastic zone. 3) Under the influence of superimposed mining
the roof of160206 return roadway presents asymmetric large deformation and failure. Basedon the support idea of butterfly plastic zone
the collaborative supporttechnology of ' asymmetric anchor cable + advanced unit support + boreholepressure relief ' has been applied
and good supporting effect has beenachieved.
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