基于非连续单元法的露天矿轮斗剥离台阶片帮灾害分析
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摘要
针对某露天煤矿轮斗剥离台阶片帮情况,对剥离台阶岩土体进行了物理力学试验,基于有限差分方法,从边坡内部应力应变特征及塑性区扩展情况开展了单台阶片落体失稳机理分析,基于改进的结构面软化模型,采用连续—非连续单元方法(CDEM)对片落体滑塌及堆积的全过程进行了数值模拟分析,对片落体的运动轨迹及堆积情况进行了模拟分析,结合现场地质环境特征,分析了单台阶片帮的触发因素,结论表明,改进的结构面软化模型可作为地质体的渐进破坏的判据,真实还原片落体垮塌全过程;采用连续-非连续单元方法可模拟材料由连续体到非连续体的渐进破坏过程,实现大变形滑坡的灾变全过程分析,研究成果可为类似工况的边坡的评价及治理提供参考。
A physico-mechanical test on stripping step rock and soil was carried out aiming at the stripping step spalling by wheel bucket in open-pit mine. Then,the instability mechanism of single step falling body was analyzed according to the stress-strain characteristics in slope and the expansion of plastic zone through a finite difference method. Based on an improved softening model of structural plane,the whole process of slip collapse and accumulation was simulated and analyzed by a continuous-discontinuous element method( CDEM). Moreover,the motion track and accumulation of the falling body were simulated and analyzed.Combining with the characteristics of geological environment in situ,the trigger factors of single step spalling were analyzed. The results show that the improved structural softening model can be used as acriterion of the progressive failure of the geological body,which can truly restore the whole collapse process of the falling body. The continuous-discontinuous element method can be used to simulate the progressive failure process of materials from continuum to discontinuity,and to realize the whole catastrophic process analysis of large deformation landslides. This study will provide reference for the evaluation and treatment of slopes under similar working conditions.
A physico-mechanical test on stripping step rock and soil was carried out aiming at the stripping step spalling by wheel bucket in open-pit mine. Then,the instability mechanism of single step falling body was analyzed according to the stress-strain characteristics in slope and the expansion of plastic zone through a finite difference method. Based on an improved softening model of structural plane,the whole process of slip collapse and accumulation was simulated and analyzed by a continuous-discontinuous element method( CDEM). Moreover,the motion track and accumulation of the falling body were simulated and analyzed.Combining with the characteristics of geological environment in situ,the trigger factors of single step spalling were analyzed. The results show that the improved structural softening model can be used as acriterion of the progressive failure of the geological body,which can truly restore the whole collapse process of the falling body. The continuous-discontinuous element method can be used to simulate the progressive failure process of materials from continuum to discontinuity,and to realize the whole catastrophic process analysis of large deformation landslides. This study will provide reference for the evaluation and treatment of slopes under similar working conditions.
引文
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[7]辛保泉,谭钦文.局部高陡边坡对排土场整体稳定性的响应规律[J].矿业研究与开发,2016,36(9):41-45.XIN Baoquan, TAN Qinwen. Reasponse of locally high and steep slope on overall stability of waste dump[J]. Mining Research and Development,2016,36(9):41-45.
[8]杨宏,才庆祥,张天文,等.布沼坝露天煤矿剥离工艺优化选择[J].中国矿业,2010,19(5):61-63.YANG Hong,CAI Qingxiang,ZHANG Tianwen,et al. Study on optimization selection of the stripping technology in Buzhaoba surface coal mine[J]. China Mining Magazine,2010,19(5):61-63.
[9]冯春,李世海,王杰.基于CDEM的顺层边坡地震稳定性分析方法研究[J].岩土工程学报,2012,34(4):717-724.FENG Chun,LI Shihai,WANG Jie. Stability analysis method for bedding rock slopes under seismic load[J]. Chinese Journal of Geotechnical Engineering,2012,34(4):717-724.
[10]李世海,周东,刘天苹.基于破裂度的堆积层滑坡危险性分析方法[J].岩石力学与工程学报,2013,32(增刊2):3909-3917.LI Shihai,ZHOU Dong,LIU Tianping. Risk analysis method of accumulated landslide based on fracture degree[J]. Chinese Journal of Rock Mechanics and Engineering,2013,32(S2):3909-3917.
[2]常永刚,赵俊,姚国栋,等.基于层次分析法的东露天矿剥离工艺选择及应用[J].煤炭工程,2013,45(11):4-6.CHANG Yonggang,ZHAO Jun,YAO Guodong,et al. Stripping process selection and application based on analytic hierarchy of East open-pit mine[J]. Coal Engineering,2013,45(11):4-6.
[3]左登兰,侯生贵.露天矿台阶高度对边坡稳定及剥离费用的影响[J].中国矿业,2000,9(1):38-40.ZUO Denglan,HOU Shenggui. Influence of open pit mine height on slope stability and stripping cost[J].China Mining Magazine,2000,9(1):38-40.
[4]周游.两矿之间散体边坡二次剥离及角度优化研究[J].中国煤炭,2018,44(6):56-59.ZHOU You. Research on secondary stripping and angle optimization of bulk slope between mine[J].China Coal,2018,44(6):56-59.
[5]赵志峰,陈育民.边坡整体和局部失稳的风险研究[J].南京林业大学学报(自然科学版),2009,33(2):121-124.ZHAO Zhifeng,CHEN Yumin. Study on risk of entire and partial of slope failure[J]. Journal of Nanjing Forestry University(Natural Science Edition),2009,33(2):121-124.
[6]孙世国,王明月,缪静芳.基于临界滑移场技术的露天矿边坡稳定性分析[J].中国矿业,2014,23(2):92-95.SUN Shiguo,WANG Mingyue,MIU Jingfang. Slope stability of open-pit mine based on critical sliding field technology[J]. China Mining Magazine,2014,23(2):92-95.
[7]辛保泉,谭钦文.局部高陡边坡对排土场整体稳定性的响应规律[J].矿业研究与开发,2016,36(9):41-45.XIN Baoquan, TAN Qinwen. Reasponse of locally high and steep slope on overall stability of waste dump[J]. Mining Research and Development,2016,36(9):41-45.
[8]杨宏,才庆祥,张天文,等.布沼坝露天煤矿剥离工艺优化选择[J].中国矿业,2010,19(5):61-63.YANG Hong,CAI Qingxiang,ZHANG Tianwen,et al. Study on optimization selection of the stripping technology in Buzhaoba surface coal mine[J]. China Mining Magazine,2010,19(5):61-63.
[9]冯春,李世海,王杰.基于CDEM的顺层边坡地震稳定性分析方法研究[J].岩土工程学报,2012,34(4):717-724.FENG Chun,LI Shihai,WANG Jie. Stability analysis method for bedding rock slopes under seismic load[J]. Chinese Journal of Geotechnical Engineering,2012,34(4):717-724.
[10]李世海,周东,刘天苹.基于破裂度的堆积层滑坡危险性分析方法[J].岩石力学与工程学报,2013,32(增刊2):3909-3917.LI Shihai,ZHOU Dong,LIU Tianping. Risk analysis method of accumulated landslide based on fracture degree[J]. Chinese Journal of Rock Mechanics and Engineering,2013,32(S2):3909-3917.
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