地震作用下软弱夹层参数对岩质边坡锚固界面剪切作用影响
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摘要
利用FLAC~(3D)软件建立了含软弱夹层的锚固岩质边坡数值模型,研究了软弱夹层参数对边坡位移响应和锚固界面剪切作用的影响,并通过正交试验对软弱夹层参数进行了敏感性分析。研究结果表明:锚固界面上的剪应力随时间呈阶梯式变化,且与地震动能量密切相关;随着软弱夹层厚度增加,边坡永久位移和峰值剪应力都增大,随着黏聚力和内摩擦角增大,二者减小,随着倾角增大,二者则先增大后减小;软弱夹层参数对界面剪应力的敏感性由大到小依次是软弱夹层倾角、黏聚力、内摩擦角和厚度。
A model of anchored rock slope with weak interlayer was established using the FLAC~(3 D) program. The influence of the weak interlayer parameters on the displacement response and the anchored interface shear action was studied. The sensitivity analysis of the weak interlayer parameters was carried out through an orthogonal experiment. The result of numerical simulation shows that the shear stress on the anchorage interface changes in steps with time, and its change is closely related to the energy of ground motion; with the increase of the thickness of the weak interlayer, the permanent displacement of slope and the peak shear stress all increase, and with the increase of cohesion and internal friction angle, they all decrease; with the increase of dip, they increase first and then decrease; the sensitivity of weak interlayer parameters to interface shear stress from great to small is the dip, cohesion, internal friction angle, thickness of weak interlayer.
A model of anchored rock slope with weak interlayer was established using the FLAC~(3 D) program. The influence of the weak interlayer parameters on the displacement response and the anchored interface shear action was studied. The sensitivity analysis of the weak interlayer parameters was carried out through an orthogonal experiment. The result of numerical simulation shows that the shear stress on the anchorage interface changes in steps with time, and its change is closely related to the energy of ground motion; with the increase of the thickness of the weak interlayer, the permanent displacement of slope and the peak shear stress all increase, and with the increase of cohesion and internal friction angle, they all decrease; with the increase of dip, they increase first and then decrease; the sensitivity of weak interlayer parameters to interface shear stress from great to small is the dip, cohesion, internal friction angle, thickness of weak interlayer.
引文
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[13]谈一评,曾镇强.简谐动力波作用下锚杆拉拔试验研究[J].岩土工程学报,2013,35(3):409-414.TAN Yiping,ZENG Zhenqiang.Pull-out tests on anchor bolts under simple harmonic waves[J].Chinese Journal of Geotechnical Engineering,2013,35(3):409-414.
[14]李云雁,胡传荣.试验设计与数据处理[M].2版.北京:化学工业出版社,2008.
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[2]许宝田,阎长虹,陈汉永,等.边坡岩体软弱夹层力学特性试验研究[J].岩土力学,2008,29(11):3077-3081.XU Baotian,YAN Changhong,CHEN Hanyong,et al.Experimental study of mechanical property of weak intercalated layers in slope rock mass[J].Rock and Soil Mechanics,2008,29(11):3077-3081.
[3]张社荣,谭尧升,王超,等.多层软弱夹层边坡岩体破坏机制与稳定性研究[J].岩土力学,2014,35(6):1695-1702.ZHANG Sherong,TAN Yaosheng,WANG Chao,et al.Research on deformation failure mechanism and stability of slope rock mass containing multi-weak interlayers[J].Rock and Soil Mechanics,2014,35(6):1695-1702.
[4]范留明,李宁.软弱夹层的透射模型及其隔震特性研究[J].岩石力学与工程学报,2005,24(14):2456-2462.FAN Liuming,LI Ning.Transmission model of weak intercalation and its vibration isolation properties[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(14):2456-2462.
[5]范留明,闫娜,李宁.薄弹性软弱夹层的动力响应模型[J].岩石力学与工程学报,2006,25(1):88-92.FAN Liuming,YAN Na,LI Ning.Dynamic response model for thin soft interlayer considering interbedded reflecting waves[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(1):88-92.
[6]刘汉香,许强,周飞,等.含软弱夹层斜坡地震动力响应特性的振动台试验研究[J].岩石力学与工程学报,2015,34(5):994-1005.LIU Hanxiang,XU Qiang,ZHOU Fei,et al.Shaking table test for seismic responses of slopes with a weak interlayer[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(5):994-1005.
[7]周飞,许强,刘汉香,等.地震作用下含水平软弱夹层斜坡动力响应特性研究[J].岩土力学,2016,37(1):133-139.ZHOU Fei,XU Qiang,LIU Hanxiang,et al.An experimental study of dynamic response characteristics of slope with horizontal weak interlayer under earthquake[J].Rock and Soil Mechanics,2016,37(1):133-139.
[8]范刚,张建经,付晓,等.含软弱夹层顺层岩质边坡动力破坏模式的能量判识方法研究[J].岩土工程学报,2016,38(5):959-966.FAN Gang,ZHANG Jianjing,FU Xiao,et al.Energy identification method for dynamic failure mode of bedding rock slope with soft strata[J].Chinese Journal of Geotechnical Engineering,2016,38(5):959-966.
[9]言志信,张刘平,曹小红,等.地震作用下顺层岩质边坡动力响应规律及变形机制研究[J].岩土工程学报,2011,33(增刊1):54-58.YAN Zhixin,ZHANG Liuping,CAO Xiaohong,et al.Dynamic response and deformation mechanism of a bedding rock slope under earthquakes[J].Chinese Journal of Geotechnical Engineering,2011,33(Sup1):54-58.
[10]李鹏,苏生瑞,王闫超,等.含软弱层岩质边坡的动力响应研究[J].岩土力学,2013,34(增刊1):365-378.LI Peng,SU Shengrui,WANG Yanchao,et al.Research on dynamic response of rock slope with weak layer[J].Rock and Soil Mechanics,2013,34(Sup1):365-378.
[11]冯志仁,刘红帅,于龙.地震作用下含软弱夹层顺层岩质边坡表面放大效应研究[J].防灾减灾工程学报,2014,34(1):96-100.FENG Zhiren,LIU Hongshuai,YU Long.Surface amplification effect of bedding rocky slope with weak interlayer under earthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2014,34(1):96-100.
[12]叶海林,黄润秋,郑颖人,等.岩质边坡锚杆支护参数地震敏感性分析[J].岩土工程学报,2010,32(9):1374-1379.YE Hailin,HUANG Runqiu,ZHENG Yingren,et al.Sensitivity analysis of parameters for bolts in rock slopes under earthquakes[J].Chinese Journal of Geotechnical Engineering,2010,32(9):1374-1379.
[13]谈一评,曾镇强.简谐动力波作用下锚杆拉拔试验研究[J].岩土工程学报,2013,35(3):409-414.TAN Yiping,ZENG Zhenqiang.Pull-out tests on anchor bolts under simple harmonic waves[J].Chinese Journal of Geotechnical Engineering,2013,35(3):409-414.
[14]李云雁,胡传荣.试验设计与数据处理[M].2版.北京:化学工业出版社,2008.
[15]郭穗勋,黄榕波.正交试验层次分析法[J].大学数学,2004,20(1):114-117.GUO Suixun,HUANG Rongbo.The AHP method of orthogonal trial[J].College Mathematics,2004,20(1):114-117.