采动底板层状岩体应力分布规律及破坏深度研究

doi:10.13722/j.cnki.jrme.2014.10.009

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摘要准确预测采动底板破坏深度是承压水上采煤中的一个关键问题。将底板层状岩体视为横观各向同性连续体，根据煤层上覆载荷分布特点，推导出煤层采动后的底板任一点应力解析解。在此基础上，分析横观各向同性底板变形参数的各向异性度(E1/E2，?1/?2)对应力分布规律的影响。根据应力计算结果，利用Mohr-Coulomb屈服准则，试算搜索出横观各向同性岩体危险剪切面并判断该面是否破坏。算例显示，弹性模量各向异性度对采动底板各种应力分布影响较大，而泊松比各向异性度只对水平应力影响较大，对垂直应力和剪应力的影响远小于弹性模量各向异性度的影响。由于考虑了层状岩体变形和强度的各向异性，横观各向同性底板最大破坏深度及其位置的计算结果与现场注水试验基本相符，较各向同性底板的计算精度要高。

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关键词 ：采矿工程, 横观各向同性, 层状岩体, 采动底板, 破坏深度

Abstract：The proper estimation of failure depths of mining floors is an important issue during mining above a confined aquifer. The layered rock mass of the floor is regarded as a transverse isotropic and continuous body. An analytical solution of the stresses in the transverse isotropic floor was derived considering the load distribution of seam overburden under the mining condition. The influence of the anisotropy(E1/E2，?1/?2) of deformation parameters of the transverse isotropic floor on the stress distribution was analysed. The dangerous shear plane of the transverse isotropic rock mass is found by the method of trial searching according to the calculated stress results and the Mohr-Coulomb yield criterion. The dangerous shear plane is then judged to be failure or not. The anisotropy of the elastic modulus is found to have a big effect on all kinds of stress distributions of the mining floor. The influence of the anisotropy of Poisson?s ratio on the vertical stress and shear stress is very small，but very significant on the horizontal stress. The calculated maximum failure depth and its location on the transverse isotropic floor are basically consistent with the results from the in-situ injection test due to considering the anisotropy of deformation and strength of layered rock mass.

Key words： mining engineering transverse isotropy layered rock mass mining floor failure depth

收稿日期: 2013-10-21

引用本文:

鲁海峰1，2，姚多喜1. 采动底板层状岩体应力分布规律及破坏深度研究[J]. 岩石力学与工程学报, 2014, 33(10): 2030-2039.
LU Haifeng1，2，YAO Duoxi1. STRESS DISTRIBUTION AND FAILURE DEPTHS OF LAYERED ROCK MASS OF MINING FLOOR. , 2014, 33(10): 2030-2039.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.10.009 或 http://www.rockmech.org/CN/Y2014/V33/I10/2030

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