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| Study on the influence of topography conditions on the dynamic characteristics of dry granular flow |
| HU Xiaobo1，2，FAN Xiaoyi3，4，JIANG Yuanjun2 |
| (1. School of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang，Sichuan 621010，China；2. Institute of Mountain Hazards and Environment，Chinese Academy of Sciences，Chengdu，Sichuan 610041，China；
3. School of Civil Engineering and Geomatics，Southwest Petroleum University，Chengdu，Sichuan 610500，China；4. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province，Southwest University of Science and Technology，Mianyang，Sichuan 621000，China) |
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Abstract The moving distance of the dry granular flow and its impact force on concrete structures are important indices to evaluate the disaster risk. The prime factor which plays an influential role in moving distance and impact force of dry granular flow is the topographic conditions. Based on the three topographic conditions(the concave topography，the slope-toe topography，and the tiered topography) of dry granular flow for a village in mountainous terrain，this paper analyzes the influence of topographic conditions on dry granular flow，accumulation distance and impact on structures，from the energy evolution point of view. The results indicate that，for concave topographic conditions，the kinetic energy conversion of the dry granular flow is higher with longer distance，the extent of damages is high and the impact force on the retaining wall at the toe of the slope is smaller. While for the slope-toe topography，the kinetic energy conversion rate of the dry granular flow is lower，the flow distance is shorter，the extent of damages is smaller and the impact force on retaining wall at the toe of the slope is higher. Under the same initialization mechanism of dry granular flow，the peak impact force for the tiered topography decreases faster than the concave topography，with the increase of distance between retaining wall and the toe of the slope. The results of this research can be a potential reference for the assessment of disaster risk mitigation and design of retaining structures for landslides or collapse granular flows.
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| [1] YIN Y P，WANG W P，ZHANG N，et al. The June 2017 Maoxian landslide：Geological disaster in an earthquake area after the Wenchuan Ms 8.0 earthquake[J]. Science China Technological Sciences，2017，60(11)：1–5.
[2] ZHANG M，MCSAVENEY M J. Rock avalanche deposits store quantitative evidence on internal shear during runout[J]. Geophysical Research Letters，2017，44(17)：8 814–8 821．
[3] YANG H Q，LAN Y F，LU L，et al. A quasi-three-dimensional spring-deformable-block model for runout analysis of rapid landslide motion[J]. Engineering Geology，2015，185：20–32．
[4] GAO Y，YIN Y，LI B，et al. Characteristics and numerical runout modeling of the heavy rainfall-induced catastrophic landslide–debris flow at Sanxicun，Dujiangyan，China，following the Wenchuan Ms 8.0 earthquake[J]. Landslides，2017，14(4)：1 361–1 374.
[5] 何思明. 滚石对防护结构的冲击压力计算[J]. 工程力学，2010，27(9)：175–180.(HE Siming. Calculation of compact pressure of rock-fall on shield structures[J]. Engineering Mechanics，2010，27(9)：175–180.(in Chinese))
[6] 何思明，沈 均，吴 永. 滚石冲击荷载下棚洞结构动力响应[J]. 岩土力学，2011，32(3)：781–788.(HE Siming，SHEN Jun，WU Yong. Rock shed dynamic response to impact of rock-fall[J]. Rock and Soil Mechanics，2011，32(3)：781–788.(in Chinese))
[7] JIANG Y J，TOWHATA I. Experimental study of dry granular flow and impact behavior against a rigid retaining wall[J]. Rock Mechanics and Rock Engineering，2013，46(4)：713–729.
[8] JIANG Y J，ZHAO Y，TOWHATA I，et al. Influence of particle characteristics on impact event of dry granular flow[J]. Power Technology，2015，270(A)：53–67.
[9] JIANG Y J，ZHAO Y. Experimental investigation of dry granular flow impact via both normal and tangential force measurements[J]. Geotechnique Letters，2015，5(1/3)：33–38.
[10] ADEL A，STéPHANE L，THIERRY F. Dry granular avalanche impact force on a rigid wall：analytic shock solution versus discrete element simulations[J]. Physical Review E，2018，97(5)：052903.
[11] 肖思友，苏立君，姜元俊. 碎屑流冲击柔性网的离散元仿真研究[J]. 岩土工程学报，2019，41(3)：526–533.(XIAO Siyou，SU Lijun，JIANG Yuanjun. Numerical investigation on flexible barriers impacted by a dry granular flow using DEM modeling[J]. Chinese Journal of Geotechnical Engineering，2019，41(3)：526–533.(in Chinese))
[12] 郝明辉，许 强，杨 磊，等. 滑坡－碎屑流物理模型试验及运动机制探讨[J]. 岩土力学，2014，35(增 1)：127–132.(HAO Minghui，XU Qiang，YANG Lei，et al. Physical modeling and movement mechanism of landslide-debris avalanches[J]. Rock and Soil Mechanics，2014，35(Supp.1)：127–132.(in Chinese))
[13] 樊晓一，乔建平. “坡”、“场”因素对大型滑坡运动特征的影响[J]. 岩石力学与工程学报，2010，29(11)：2 337–2 347.(FAN Xiaoyi，QIAO Jianping. Influence of landslide ground factors on large-scale landslide movement[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(11)：2 337–2 347.(in Chinese))
[14] 王玉峰，许 强，程谦恭，等. 复杂三维地形条件下滑坡–碎屑流运动与堆积特征物理模拟实验研究[J]. 岩石力学与工程学报，2016，35(9)：1 776–1 791.(WANG Yufeng，XU Qiang，CHEN Qiangong，et al. Experimental study on the propagation and deposit features of rock avalanche along 3D complex topography[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(9)：1 776–1 791.(in Chinese))
[15] 杨海龙，樊晓一，赵运会，等. 偏转角度对滑坡-碎屑流运动影响的模型试验[J]. 山地学报，2017，35(3)：316–322.(YANG Hailong，FAN Xiaoyi，ZHAO Yunhui，et al. Model tests on influence of deflection angle on the movement of landslide-debris avalanches[J]. Mountain Research，2017，35(3)：316–322.(in Chinese))
[16] 胡晓波，樊晓一，田述军. 沟道偏转地形对滑坡碎屑流运动的影响研究[J]. 山地学报，2019，37(3)：371–381.(HU Xiaobo，FAN Xiaoyi，TIAN Shujun. Influence of channel deflection on the movement of a flowing landslide[J]. Mountain Research，2019，37(3)：371–381.(in Chinese))
[17] BI Y Z，HE S M，LI X P，et al. Geo-engineered buffer capacity of two-layered absorbing system under the impact of rock avalanches based on Discrete Element Method[J]. Journal of Mountain Science，2016，13(5)：917–929.
[18] 樊晓一，胡晓波，张睿骁，等. 开阔型地形条件对滑坡运动距离的影响研究[J]. 自然灾害学报，2018，27(5)：188–196.(FAN Xiaoyi，HU Xiaobo，ZHANG Ruixiao，et al. Study on the open topography influence on the moving distances of landslides[J]. Journal of Natural Disasters，2018，27(5)：188–196.(in Chinese))
[19] 眭 静，姜元俊，樊晓一，等. 碎屑流冲击刚性挡墙的力学模型研究[J]. 岩石力学与工程学报，2019，38(1)：121–132.(SUI Jing，JIANG Yuanjun，FAN Xiaoyi，et al. An impact model of granular flows on a rigid wall[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(1)：121–132.(in Chinese))
[20] VALENTINO R，BARLA G，MONTRASIO L. Experimental analysis and micromechanical modelling of dry granular flow and impacts in laboratory flume tests[J]. Rock Mechanics and Rock Engineering，2008，41(1)：153.
[21] Itasca Consulting Group Inc. Manual of particle flow code in 3-dimension[M]. Minnesota：[s. n.]，2008：216–232.
[22] 曾耀勋，樊晓一，段晓冬. 坡脚型场地对滑体运动的减速机制研究[J]. 水土保持通报，2014，34(4)：193–196.(ZENG Yaoxun ，FAN Xiaoyi，DUAN Xiaodong. Deceleration mechanism of slope foot site to landslide movement[J]. Bulletin of Soil and Water Conservation，2014，34(4)：193–196.(in Chinese))
[23] KWAN J S H，CHEUNG R W M. Suggestion on design approaches for flexible debris-resisting barriers[C]// Proceedings of the HKIE Geotechnical Division Annual Seminar 2017. Hong Kong：[s. n.]，2012：216–232.
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2020, Vol. 39 
