本文關(guān)鍵詞： 崩塌危巖 PFCD 離散元 堆積形態(tài) 坡面摩擦系數(shù)　出處：《巖土力學》2014年S1期 　論文類型：期刊論文

【摘要】：崩塌危巖是高陡巖質(zhì)邊坡淺表層破壞常見的動力地質(zhì)災害方式之一,它突發(fā)性強,隨機性大,速度快,發(fā)生猛烈,一直是邊坡工程勘察中的重點。對西藏樟木后山高陡邊坡危巖進行了現(xiàn)場勘察,分析研究了危巖崩塌體的分布范圍。利用PFC3D模擬了在降雨件下危巖崩塌危巖的運動軌跡、速度及不同摩擦系數(shù)崩塌體的堆積特征。計算分析結(jié)果表明,崩塌危巖運動路徑受地形地貌影響較大,與地面發(fā)生碰撞,多次改變行進方向,簡化二維計算可能得出錯誤結(jié)論;坡面摩擦系數(shù)影響崩塌危巖的堆積形態(tài),摩擦系數(shù)越小,堆積體位置越遠,運動狀態(tài)易表現(xiàn)流態(tài)性狀。坡面摩擦系數(shù)取1.2時,模擬結(jié)果與實際較為吻合;崩塌危巖主要危害的范圍為陡崖下部武警二營至樟木溝口一帶。利用PFC3D模擬危巖崩塌運動可以初步確定崩塌體三維堆積形態(tài)及影響范圍,為防災減災工程設計提供有益參考。
[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.

【作者單位】： 中國科學院水利部成都山地災害與環(huán)境研究所;華北水利水電大學巖土工程與水工結(jié)構(gòu)研究院;中國科學院大學;
【基金】：國家自然科學基金資助(No.41272346) 水利部公益性行業(yè)科研專項經(jīng)費項目資助(No.201301034) 鄭州市創(chuàng)新型科技人才培育計劃領(lǐng)軍人才項目資助(No.10LJRC185)
【分類號】：TU45

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