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(xué)》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(jiàn)的動(dòng)力地質(zhì)災(zāi)害方式之一,它突發(fā)性強(qiáng),隨機(jī)性大,速度快,發(fā)生猛烈,一直是邊坡工程勘察中的重點(diǎn)。對(duì)西藏樟木后山高陡邊坡危巖進(jìn)行了現(xiàn)場(chǎng)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(yùn)動(dòng)軌跡、速度及不同摩擦系數(shù)崩塌體的堆積特征。計(jì)算分析結(jié)果表明,崩塌危巖運(yùn)動(dòng)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(jìn)方向,簡(jiǎn)化二維計(jì)算可能得出錯(cuò)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(yuǎn),運(yùn)動(dòng)狀態(tài)易表現(xiàn)流態(tài)性狀。坡面摩擦系數(shù)取1.2時(shí),模擬結(jié)果與實(shí)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(yíng)至樟木溝口一帶。利用PFC3D模擬危巖崩塌運(yùn)動(dòng)可以初步確定崩塌體三維堆積形態(tài)及影響范圍,為防災(zāi)減災(zāi)工程設(shè)計(jì)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(guó)科學(xué)院水利部成都山地災(zāi)害與環(huán)境研究所;華北水利水電大學(xué)巖土工程與水工結(jié)構(gòu)研究院;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家自然科學(xué)基金資助(No.41272346) 水利部公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目資助(No.201301034) 鄭州市創(chuàng)新型科技人才培育計(jì)劃領(lǐng)軍人才項(xiàng)目資助(No.10LJRC185)
【分類號(hào)】：TU45

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉傳正，，張明霞;鏈子崖T_（11）—T_（12）縫段危巖體開(kāi)裂變形機(jī)制[J];地學(xué)前緣;1996年02期

2 宋飛;;桂林市獨(dú)秀峰危巖穩(wěn)定性分析[J];黑龍江科技信息;2010年11期

3 于超;韓嶺;李浩;馬煜;;玉井小學(xué)危巖體穩(wěn)定性分析[J];四川建筑;2011年02期

4 哈秋

本文編號(hào)：1521434