含缓倾软弱夹层的矿山高边坡长期稳定性分析
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摘要
选取常规力学试验参数与反演环剪流变试验得到的流变参数,采用基于Burgers流变模型的数值计算方法对四川省峨胜水泥采矿场含缓倾软弱夹层的变形体边坡进行长期稳定性分析。结果表明:可用Burgers模型来描述二叠系含泥软弱夹层的流变变形特性;Burgers流变模型的数值计算结果显示该边坡已出现破坏,且监测点的位移曲线与实际监测点曲线拟合度较高,表明软弱夹层的流变特性在边坡破坏机制中起主导作用。对比传统的极限平衡法与强度折减法,含此类缓倾软弱夹层边坡的长期稳定性分析宜采用基于Burgers流变模型的数值计算方法。
The stability of a high slope containing gently-inclined soft interlayers in Esheng open-pit limestone mine was analyzed by using Burgers rheological model based on conventional mechanical test parameters and rheological parameters obtained by inversion of cyclic shear rheological test. Results demonstrate that Burgers rheological model is able to describe the rheological property of the argillaceous soft interlayers in Permian formation. Simulation results based on the Burgers rheological model revealed the failure of high slope and a high fitting degree between simulated displacement and field-monitored displacement,indicating that the rheological property of soft interlayers plays a dominant role in the failure of high slopes. In conclusion,compared with traditional limit equilibrium method and strength reduction method,Burgers rheological model is more appropriate in researching the long-term stability of high slopes containing gently-inclined soft interlayers.
The stability of a high slope containing gently-inclined soft interlayers in Esheng open-pit limestone mine was analyzed by using Burgers rheological model based on conventional mechanical test parameters and rheological parameters obtained by inversion of cyclic shear rheological test. Results demonstrate that Burgers rheological model is able to describe the rheological property of the argillaceous soft interlayers in Permian formation. Simulation results based on the Burgers rheological model revealed the failure of high slope and a high fitting degree between simulated displacement and field-monitored displacement,indicating that the rheological property of soft interlayers plays a dominant role in the failure of high slopes. In conclusion,compared with traditional limit equilibrium method and strength reduction method,Burgers rheological model is more appropriate in researching the long-term stability of high slopes containing gently-inclined soft interlayers.
引文
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[3]李育枢.深挖路堑公路边坡岩体力学参数及获取方法体系研究——以贵州省公路边坡为例[D].成都:成都理工大学,2003.
[4]郝亚飞,李海波,郭学彬,等.含软弱夹层顺层岩体爆破效应模拟试验研究[J].煤炭学报,2012,37(3):389-395.
[5]肖正学,郭学彬,张继春,等.含软弱夹层顺倾边坡爆破层裂效应的数值模拟与试验研究[J].岩土力学,2009,30(增1):15-18.
[6]韦猛.峨眉水泥厂矿山地质灾害评价与施工控制研究[D].成都:成都理工大学,2007.
[7]卞洁,裴广龙,张飞,等.不排水条件下开挖边坡稳定性极限分析[J].长江科学院院报,2017,34(5):115-119.
[8]廖红建,殷建华.人工开挖边坡的长期稳定性分析与土的强度参数确定[J].岩土工程学报,2002,24(5):560-564.
[9]姚文敏,胡斌,余海兵,等.三维软硬互层边坡的破坏模式与稳定性研究[J].工程科学学报,2017,(2):182-189.
[10]MARANINI E,BRIGNOLI M.Creep Behavior of a Weak Rock:Experimental Characterization[J].International Journal of Rock Mechanics and Mining Sciences,1999,36(1):127-138.
[11]YANG C H,DAEMEN J J K,YIN J H.Experimental Investigation of Creep Behavior of Salt Rock[J].International Journal of Rock Mechanics and Mining Sciences,1999,36(2):233-242.
[12]SLIZOWSKI J,LANKOF L.Salt-mudstones and Rocksalt Suitabilities for Radio-active-waste Storage Systems:Rheological Properties[J].Applied Energy,2003,75(1):137-144.
[13]YAHYAO M L,AUBERTIN M,JULIEN M R.A Unified Representation of the Plasticity,Creep and Relaxation Behavior of Rocksalt[J].International Journal of Rock Mechanics and Mining Sciences,2000,37(5):787-800.
[14]魏龙生.软弱夹层对岩质边坡稳定性影响研究[D].昆明:昆明理工大学,2015.
[15]刘晶辉,申力.软弱泥化夹层蠕变特征与边坡变形分析[J].露天采煤技术,2001,(1):28-30.
[16]吴迪,简文彬,徐超.残积土抗剪强度的环剪试验研究[J].岩土力学,2011,32(7):2045-2050.