巷道复合顶板层间离层稳定性量化判据选择

doi:10.13722/j.cnki.jrme.2014.10.010

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摘要为选择合理的巷道复合顶板层结间离层稳定性量化判据，选用巷道宽度、复合顶板岩性、复合顶板厚度及结构面黏聚力和内摩擦角5个不同因素，设计5×5共25组正交数值计算模型，采用ANSYS数值模拟软件分析不同地应力各数值计算模型中结构面应力和层间离层分布，并用工程实测进行验证。在此基础上，分析巷道复合顶板离层失稳力学机制。结果表明：巷道中心位置复合顶板层间离层值并不能敏感反映层间离层稳定性，采用巷道中部复合顶板结构面法向拉应力引起的局部分离范围作为离层稳定性判据更趋合理，其临界容许值和巷道宽度显著相关，一般为巷道宽度的0.50～0.75倍。

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关键词 ：采矿工程, 复合顶板, 层间离层稳定性, 结构面拉应力范围, 局部分离范围临界容许值, 巷道宽度

Abstract：In order to find a reasonable quantitative criteria to judge the stability of interlayer separation of complex roof in tunnels，the different stresses of structure surfaces and the distribution of interlayers to be separated were simulated and analyzed with ANSYS program to a total of 5×5 sets of orthogonal models considering 5 factors including the rock properties of the complex roof，the tunnel width，the rock thickness of complex roof，the cohesions and the internal friction angles of structure planes. The distribution of the interlayers to be separated was validated by engineering practice，and the mechanism of instability of the structural plane separation was analyzed. Using the separation range caused by the tensile stress in the middle of the structure plane to judge the stability was found to be more reasonable than using the interlayer separation size in the center of complex roof，and the threshold value of the separation range was 0.50–0.75 times of the tunnel width.

Key words： mining engineering complex roof stability of interlayer separation normal tensile stress scope of structure plane part separation threshold of structure plane tunnel width

收稿日期: 2014-06-20

引用本文:

吴德义，申法建. 巷道复合顶板层间离层稳定性量化判据选择[J]. 岩石力学与工程学报, 2014, 33(10): 2040-2046.
WU Deyi，SHEN Fajian. QUANTITATIVE CRITERIA OF INTERLAYER SEPARATION STABILITY OF COMPLEX ROOF IN TUNNELS. , 2014, 33(10): 2040-2046.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.10.010 或 http://www.rockmech.org/CN/Y2014/V33/I10/2040

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