【摘要】：攀枝花機場12#滑坡位于機場北段東側(cè)一寬緩溝谷區(qū)的上部總體積約510×104m3,系由填筑體失穩(wěn)、下方俞家坪老滑坡復(fù)活而成。由于填筑體的體量相對與易家坪老滑坡的體量是很小的,從縱向長度上,前者僅相當(dāng)于后者1/10,為何體量如此小的填筑體失穩(wěn)會導(dǎo)致體量很大的老滑坡復(fù)活,從影響因素到內(nèi)在力學(xué)機理過程上,都是值得深入研究的。本文通過對研究區(qū)自然地理及地質(zhì)環(huán)境條件復(fù)核,以及滑坡體變形失穩(wěn)及老滑坡復(fù)活特征研究,通過數(shù)值模擬分析了降雨前后12#滑坡滲流場的變化,以及12#滑坡失穩(wěn)破壞過程,試圖揭示12#填筑體失穩(wěn)及易家坪老滑坡復(fù)活機理,以豐富人們對山區(qū)機場“高位填方體失穩(wěn)-低位滑坡復(fù)活”這種災(zāi)害鏈發(fā)生機理的認(rèn)識。取得了如下成果:1.闡述了填筑體失穩(wěn)及老滑坡復(fù)活機理的概念模型分析,長期降雨導(dǎo)致填筑體飽水軟化,并在地下水滲流作用下,填筑體不斷地變形,最終失穩(wěn)垮滑。2.利用seep軟件分析降雨前后12#滑坡的滲流-應(yīng)力場變化,降雨前后坡腳處地下水位變化最為明顯,填筑體、砂巖、老滑坡的滲透性對滲流場均有不同影響。3.通過顆粒流軟件PFC2D分析了填筑體失穩(wěn)以及老滑坡復(fù)活過程,表明填筑體失穩(wěn)后是以垮滑的形式超覆于老滑坡體,對老滑坡體的沖擊力隨水平方向呈滯后性,在垂直方向上作用隨深度減小。4.建立巨滑后殘坡體數(shù)值模型,分析了殘坡體的再變形機理,結(jié)果表明,天然工況下殘坡體處于蠕滑狀態(tài),暴雨作用下殘坡體后緣處應(yīng)力-應(yīng)變變化最為明顯,最終再次失穩(wěn)復(fù)活。
[Abstract]:The No. 12 landslide of Panzhihua Airport is located in the upper part of the east part of the northern section of the airport, the total volume of which is about 510 脳 10 ~ 4m ~ (3), which is formed by the instability of the filling body and the resurrection of the old landslide at the bottom of Yujiaping. Because the volume of the fill is relatively small to that of the old landslide in Yijiaping, the former is only one tenth of the size of the latter in terms of longitudinal length. Why does the instability of such a small volume of the filling lead to the revival of a large number of old landslides? In the process of influencing factors and internal mechanics mechanism, it is worth studying deeply. In this paper, the physical geography and geological environment of the study area are reviewed, and the deformation instability of landslide and the characteristics of old landslide are studied. The variation of seepage field of 12 # landslide before and after rainfall and the failure process of 12 # landslide are analyzed by numerical simulation. This paper attempts to reveal the mechanism of the instability of the No. 12 filling body and the resurrection of the old landslide in Yijiaping, in order to enrich the understanding of the mechanism of the disaster chain of "the instability of the high filling body and the resurrection of the low landslide" in the mountainous airport. The following results have been achieved: 1. This paper describes the conceptual model analysis of the instability of the filling body and the resurrection mechanism of the old landslide. The long-term rainfall causes the filling body to soften, and under the action of the groundwater seepage, the filling body is constantly deformed, and finally the instability collapses. 2. The seepage stress field of 12 # landslide before and after rainfall is analyzed by seep software. The change of groundwater level at the foot of slope is most obvious before and after rainfall. The permeability of filling body, sandstone and old landslide all have different influence on seepage field. The instability of the filling body and the resurrection process of the old landslide are analyzed by the particle flow software PFC2D. The results show that the rockfill overrides the old landslide in the form of collapse after the instability, and the impact force on the old landslide is delayed with the horizontal direction. In the vertical direction, the action decreases with depth. A numerical model of residual slope body after giant slide is established, and the mechanism of redeformation of residual slope body is analyzed. The results show that the residual slope body is in creep state under natural conditions, and the stress-strain change is most obvious in the rear edge of residual slope body under the action of torrential rain. Finally, it was unstable and resurrected again.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P642.22

【參考文獻(xiàn)】

中國期刊全文數(shù)據(jù)庫 前10條

1 劉漢東;李冬冬;王忠福;;基于有限元極限平衡法的生基坪滑坡穩(wěn)定性分析[J];華北水利水電大學(xué)學(xué)報(自然科學(xué)版);2015年03期

2 石崇;王盛年;劉琳;;地震作用下陡巖崩塌顆粒離散元數(shù)值模擬研究[J];巖石力學(xué)與工程學(xué)報;2013年S1期

3 許強;;滑坡的變形破壞行為與內(nèi)在機理[J];工程地質(zhì)學(xué)報;2012年02期

4 劉新榮;傅晏;鄭穎人;鐘祖良;;顆粒流細(xì)觀強度參數(shù)與巖石斷裂韌度之間的關(guān)系[J];巖石力學(xué)與工程學(xué)報;2011年10期

5 丁參軍;張林洪;于國榮;張永祥;;邊坡穩(wěn)定性分析方法研究現(xiàn)狀與趨勢[J];水電能源科學(xué);2011年08期

6 李新坡;何思明;;節(jié)理巖質(zhì)邊坡破壞過程的PFC2D數(shù)值模擬分析[J];四川大學(xué)學(xué)報(工程科學(xué)版);2010年S1期

7 胡明鑒;汪稔;陳中學(xué);王志兵;;泥石流啟動過程PFC數(shù)值模擬[J];巖土力學(xué);2010年S1期

8 周喻;吳順川;馬聰;張曉平;;基于顆粒流理論的露天礦排土場穩(wěn)定性分析[J];中國礦業(yè);2010年07期

9 陳星;李建林;;基于ADINA、ANSYS、FLAC的強度折減法[J];水文地質(zhì)工程地質(zhì);2010年03期

10 孫德安;;非飽和土的水力和力學(xué)特性及其彈塑性描述[J];巖土力學(xué);2009年11期

中國博士學(xué)位論文全文數(shù)據(jù)庫 前1條

1 林斌;考慮損傷效應(yīng)的黃土流變模型研究[D];長安大學(xué);2005年

中國碩士學(xué)位論文全文數(shù)據(jù)庫 前3條

1 谷聲早;攀枝花機場12#滑坡及后壁的變形監(jiān)測與穩(wěn)定性分析[D];成都理工大學(xué);2011年

2 張金航;高填方邊坡變形破壞機理及防治對策研究[D];成都理工大學(xué);2010年

3 王曉峰;降雨入滲對非飽和土邊坡穩(wěn)定性影響的研究[D];西安建筑科技大學(xué);2003年

，

本文編號：2219641