Research on Creep Supporting Effect of Deep Strip Pillar

摘要：   为研究深部条带煤柱蠕变支撑效应，对岱庄煤矿3上煤进行了蠕变试验。以试验结果为基础，采用LS-DYNA数值方法分析了深部煤柱的蠕变支撑效应。结果表明，该煤岩环向起始蠕变应力3.061 MPa，远远低于轴向起始蠕变应力7.020 MPa；蠕变强度为9.327 MPa，蠕变系数为0.647；结合蠕变试验结果，采用LS-DYNA可以较好的模拟深部条带煤柱的蠕变支撑效应；模拟的条带煤柱呈现出明显的流变性，在工作面开采后煤柱状态仍然会发生较大变化；在上覆岩层的作用下，该煤柱变形在15~16个月后不再变化，煤柱能够保持长期稳定状态。

关键词: 蠕变试验；深部煤柱；LS-DYNA；数值模拟；蠕变支撑效应

Abstract:   To study the creep supporting effect of deep strip pillar，the creep test of upper No.3 coal seam in Daizhuang Coal Mine is carried out．Based on the experiment results，the creep supporting effect of deep coal pillar was analyzed by using LS-DYNA software．The results show that the circumferential initial creep stress of the coal/rock sample is 3.061 MPa，which is far below the axial initial creep stress of 7.020 MPa．In addition，the creep strength and creep coefficient are 9.327 MPa and 0.647，respectively．Combined with the test results，the creep supporting effect of deep strip pillar can be simulated excellently by LS-DYNA software．The stress and deformation in simulated strip pillar show evident rheological properties．The situation of the pillar still changes greatly after the extraction of coal face．Under the effect of the overlying strata，the deformation of coal pillar is unchanged after15 ~ 16 months，and can keep stability for a long time.

Key words: creep test；deep coal pillar；LS-DYNA software；numerical simulation；creep supporting effect