滑坡碎屑流冲击力影响因素的离散元模拟
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摘要
采用三维离散元模拟方法,研究了刚性挡板与坡脚的距离和坡角对滑坡碎屑流冲击力的影响。结果表明:相同坡角下,随着挡板距离的增加,滑坡碎屑流颗粒对挡板的冲击力逐渐减小;坡角越大,最大冲击力耗散越大;不同坡角下最大冲击力出现的时间有较大差异。挡板所受冲击力与时间的关系曲线可近似分为线性增大、持力阶段、线性减小3个阶段,3个阶段的变化随坡角的增大逐渐明显。冲击力线性增大阶段,坡角越大冲击力增加得越快;冲击力持力阶段的时间随着挡板距离增大而增加。
The three dimensional discrete element simulation was used to study the influence of the distance between rigid baffle and slope toe and the angle of slope toe on the impact force oflandslide debris flow.The results showthat the impact force oflandslide debris flowparticles on baffle decreases gradually with the baffle distance increasing at the same angle of slope toe,the larger the angle of slope toe,the greater the dissipation of maximum impact force is,and the time of maximum impact force appearance at different angle of slope toe is quite different.The relationship curve between impact force and time of baffle can be approximately divided into such three stages as linear increasing stage,holding stage and linear decreasing stage,the change of the three stages is gradually obvious with the increase of slope toe angle.In the linear increasing stage ofimpact force,the greater the angle of slope toe,the faster the impact force increases,and the duration ofimpact force holding stage increases with the baffle distance increasing.
The three dimensional discrete element simulation was used to study the influence of the distance between rigid baffle and slope toe and the angle of slope toe on the impact force oflandslide debris flow.The results showthat the impact force oflandslide debris flowparticles on baffle decreases gradually with the baffle distance increasing at the same angle of slope toe,the larger the angle of slope toe,the greater the dissipation of maximum impact force is,and the time of maximum impact force appearance at different angle of slope toe is quite different.The relationship curve between impact force and time of baffle can be approximately divided into such three stages as linear increasing stage,holding stage and linear decreasing stage,the change of the three stages is gradually obvious with the increase of slope toe angle.In the linear increasing stage ofimpact force,the greater the angle of slope toe,the faster the impact force increases,and the duration ofimpact force holding stage increases with the baffle distance increasing.
引文
[1]吴越,刘东升,李硕洋.基于滑体与受灾体共同作用的冲击能计算模型[J].岩石力学与工程学报,2012,31(增1):2636-2643.
[2]吴越,刘东升,李明军.岩体滑坡冲击能计算及受灾体易损性定量评估[J].岩石力学与工程学报,2011,30(5):901-909.
[3]吴越,刘东升,陆新,等.基于功-能关系的滑坡典型受灾体易损性评估模型[J].岩石力学与工程学报,2011,30(增1):2946-2953.
[4]吴越,刘东升,李明军.滑体下滑及冲击受灾体过程中的能耗规律模型试验[J].岩石力学与工程学报,2011,30(4):693-701.
[5]吴越,刘东升,张小飞,等.滑坡灾害易损性定量评估模型应用与比较[J].地下空间与工程学报,2012,8(5):916-921.
[6]陈光平,赵其华,黄河清.文家沟巨型岩质滑坡高速远程运移特征分析[J].工程地质学报,2011,19(3):404-408.
[7]陆鹏源,侯天兴,杨兴国,等.滑坡冲击铲刮效应物理模型试验及机制探讨[J].岩石力学与工程学报,2016,35(6):1225-1232.
[8]朱圻,程谦恭,王玉峰,等.高速远程滑坡超前冲击气浪三维动力学分析[J].岩土力学,2014,35(10):2909-2926.
[9]朱圻,程谦恭,王玉峰,等.牛圈沟高速远程滑坡超前冲击气浪机制分析[J].岩石力学与工程学报,2014,33(6):1212-1226.
[10]JIANG Y J,TOWHATA I.Experimental Study of Dry Granular Flow and Impact Behavior Against a Rigid Retaining Wall[J].Rock Mechanics&Rock Engineering,2013,46(4):713-729.
[11]ALBABA A,LAMBERT S,NICOT F,et al.Relation Between Microstructure and Loading Applied by a Granular Flow to a Rigid Wall Using DEM Modeling[J]. Granular Matter,2015,17(5):603-616.
[12]KISHI N,KONNO H,IKEDA K,et al. Prototype Impact Tests on Ultimate Impact Resistance of PC Rock-sheds[J].International Journal of Impact Engineering,2002,27(9):969-985.
[13]WANG S N,SHI C,XU W,et al.Estimation of Landslide Impact Disaster by Discrete Element Method:Jiangping Hydropower Station,Hubei,China[C]//Kyoji Sassa,Paolo Canuti,Yueping Yined. Landslide Science for a Safer Geoenvironment. China:Springer International Publishing Switzerland,2014:669-678.
[14]贾旭光,陈曦,李鑫.不同粒度和堆载形态下散体瞬时自然安息角的实验研究[J].现代矿业,2015(1):25-27.
[15]刘军,于刚,赵长兵,等.不同尺度分布散粒材料砂堆形成过程的二维离散元模拟[J].计算力学学报,2008,25(4):568-573.
[16]王云霞,梁志杰,张东兴,等.基于离散元的玉米种子颗粒模型种间接触参数标定[J].农业工程学报,2016,32(22):36-42.
[2]吴越,刘东升,李明军.岩体滑坡冲击能计算及受灾体易损性定量评估[J].岩石力学与工程学报,2011,30(5):901-909.
[3]吴越,刘东升,陆新,等.基于功-能关系的滑坡典型受灾体易损性评估模型[J].岩石力学与工程学报,2011,30(增1):2946-2953.
[4]吴越,刘东升,李明军.滑体下滑及冲击受灾体过程中的能耗规律模型试验[J].岩石力学与工程学报,2011,30(4):693-701.
[5]吴越,刘东升,张小飞,等.滑坡灾害易损性定量评估模型应用与比较[J].地下空间与工程学报,2012,8(5):916-921.
[6]陈光平,赵其华,黄河清.文家沟巨型岩质滑坡高速远程运移特征分析[J].工程地质学报,2011,19(3):404-408.
[7]陆鹏源,侯天兴,杨兴国,等.滑坡冲击铲刮效应物理模型试验及机制探讨[J].岩石力学与工程学报,2016,35(6):1225-1232.
[8]朱圻,程谦恭,王玉峰,等.高速远程滑坡超前冲击气浪三维动力学分析[J].岩土力学,2014,35(10):2909-2926.
[9]朱圻,程谦恭,王玉峰,等.牛圈沟高速远程滑坡超前冲击气浪机制分析[J].岩石力学与工程学报,2014,33(6):1212-1226.
[10]JIANG Y J,TOWHATA I.Experimental Study of Dry Granular Flow and Impact Behavior Against a Rigid Retaining Wall[J].Rock Mechanics&Rock Engineering,2013,46(4):713-729.
[11]ALBABA A,LAMBERT S,NICOT F,et al.Relation Between Microstructure and Loading Applied by a Granular Flow to a Rigid Wall Using DEM Modeling[J]. Granular Matter,2015,17(5):603-616.
[12]KISHI N,KONNO H,IKEDA K,et al. Prototype Impact Tests on Ultimate Impact Resistance of PC Rock-sheds[J].International Journal of Impact Engineering,2002,27(9):969-985.
[13]WANG S N,SHI C,XU W,et al.Estimation of Landslide Impact Disaster by Discrete Element Method:Jiangping Hydropower Station,Hubei,China[C]//Kyoji Sassa,Paolo Canuti,Yueping Yined. Landslide Science for a Safer Geoenvironment. China:Springer International Publishing Switzerland,2014:669-678.
[14]贾旭光,陈曦,李鑫.不同粒度和堆载形态下散体瞬时自然安息角的实验研究[J].现代矿业,2015(1):25-27.
[15]刘军,于刚,赵长兵,等.不同尺度分布散粒材料砂堆形成过程的二维离散元模拟[J].计算力学学报,2008,25(4):568-573.
[16]王云霞,梁志杰,张东兴,等.基于离散元的玉米种子颗粒模型种间接触参数标定[J].农业工程学报,2016,32(22):36-42.