西藏樟木后山危岩崩塌颗粒离散元数值分析

发布时间：2018-02-21 08:01

本文关键词： 崩塌危岩 PFCD 离散元堆积形态坡面摩擦系数　出处：《岩土力学》2014年S1期 　论文类型：期刊论文

【摘要】：崩塌危岩是高陡岩质边坡浅表层破坏常见的动力地质灾害方式之一,它突发性强,随机性大,速度快,发生猛烈,一直是边坡工程勘察中的重点。对西藏樟木后山高陡边坡危岩进行了现场勘察,分析研究了危岩崩塌体的分布范围。利用PFC3D模拟了在降雨件下危岩崩塌危岩的运动轨迹、速度及不同摩擦系数崩塌体的堆积特征。计算分析结果表明,崩塌危岩运动路径受地形地貌影响较大,与地面发生碰撞,多次改变行进方向,简化二维计算可能得出错误结论;坡面摩擦系数影响崩塌危岩的堆积形态,摩擦系数越小,堆积体位置越远,运动状态易表现流态性状。坡面摩擦系数取1.2时,模拟结果与实际较为吻合;崩塌危岩主要危害的范围为陡崖下部武警二营至樟木沟口一带。利用PFC3D模拟危岩崩塌运动可以初步确定崩塌体三维堆积形态及影响范围,为防灾减灾工程设计提供有益参考。
[Abstract]:The rockfall is high and steep rock slope surface damage power of geological disasters in common, it is sudden, random, fast, violent, has been the focus in slope engineering investigation. On Tibet, after the high mountains and steep slope rock conducted on-site investigation, analysis of the distribution range of collapse body the simulated rainfall conditions. In the collapse of perilous rock trajectory by using the PFC3D, the accumulation characteristics of velocity and different friction coefficient of landslide. The calculation results show that the rockfall movement path is affected by the topography is large, collide with the ground, repeatedly changing the direction of travel, the simplified calculation may get wrong results of two-dimensional slope friction pile; influence of shape coefficient of rockfall, the friction coefficient is small, the accumulation body is far away, the motion state of easy flow performance traits. Slope friction coefficient is 1.2, the simulation results and real As is consistent with the rockfall hazard range; the main cliff is part of two armed police battalion to Zhangmu Mizoguchi area. Simulation of avalanche motion can be preliminarily determined the three-dimensional body collapse accumulation form and influence scope of the use of PFC3D, provide a useful reference for disaster prevention and mitigation.

【作者单位】：中国科学院水利部成都山地灾害与环境研究所;华北水利水电大学岩土工程与水工结构研究院;中国科学院大学;
【基金】：国家自然科学基金资助(No.41272346) 水利部公益性行业科研专项经费项目资助(No.201301034) 郑州市创新型科技人才培育计划领军人才项目资助(No.10LJRC185)
【分类号】：TU45

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