本文選題：滑坡群 + 形成機(jī)制��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：丹巴縣中路鄉(xiāng)滑坡群位于中路鄉(xiāng)小金河左岸斜坡,基本沿岸坡方向展布,共有大大小小共9個(gè)滑坡。近年來(lái)滑坡群變形破壞加劇,造成中路鄉(xiāng)公路下錯(cuò),滑坡附近房屋開(kāi)裂,農(nóng)田滑動(dòng)毀壞,以及大量的局部垮塌,對(duì)中路鄉(xiāng)村民的生命財(cái)產(chǎn)安全形成極大隱患,對(duì)通鄉(xiāng)公路的正常交通造成嚴(yán)重威脅,如果滑坡整體下滑甚至?xí)氯〗鸷雍拥?后果不堪設(shè)想。本文通過(guò)現(xiàn)場(chǎng)勘查,分析了中路鄉(xiāng)滑坡群空間分布、發(fā)育特征、形成原因及滑動(dòng)模式。然后對(duì)區(qū)內(nèi)典型滑坡進(jìn)行詳細(xì)的研究,判斷它們現(xiàn)在的變形破壞機(jī)理,并使用Flac3D數(shù)值模擬軟件模擬了典型滑坡的變形破壞機(jī)制,最后采用不平衡推力法定量計(jì)算了典型滑坡的穩(wěn)定性。本文主要的研究?jī)?nèi)容和成果如下:(1)根據(jù)野外調(diào)查結(jié)果并結(jié)合相關(guān)文獻(xiàn),認(rèn)為中路鄉(xiāng)滑坡群是存在位于F1斷層上盤(pán)和下盤(pán)兩種發(fā)育模式的滑坡群,位于F1斷層上盤(pán)的滑坡數(shù)量較多,滑動(dòng)模式為牽引式崩滑,變形破壞特征較小;而位于F1斷層下盤(pán)的滑坡數(shù)量少,滑動(dòng)模式為推移式,變形破壞特征明顯。通過(guò)分析滑坡形成的各種內(nèi)外因,得出區(qū)內(nèi)坡體破壞模式為下盤(pán)巖土體順層滑動(dòng)牽引上盤(pán)巖土體崩滑;上盤(pán)滑坡多發(fā)育在基巖陡崖后方,受到下方基巖失穩(wěn)或其他因素誘發(fā)滑動(dòng),下盤(pán)滑坡主要為早期岸坡崩滑后形成的堆積體,在外界因素誘發(fā)下滑動(dòng)。(2)位于斷層下盤(pán)的滑坡近年來(lái)滑動(dòng)明顯,個(gè)別滑坡已經(jīng)整體滑動(dòng)。通過(guò)對(duì)典型滑坡波色龍滑坡的研究,認(rèn)為主要是在受到2012年公路開(kāi)挖影響導(dǎo)致坡體應(yīng)力重新調(diào)整,坡體出現(xiàn)拉張裂縫,坡腳產(chǎn)生塑性變形,隨后而至的強(qiáng)降雨誘發(fā)了波色龍古滑坡的部分復(fù)活,數(shù)值模擬結(jié)果也印證了這種判斷,在坡體開(kāi)挖前暴雨工況滑坡主要為淺層滑動(dòng),開(kāi)挖后暴雨工況的滑坡整體發(fā)生滑動(dòng)。(3)位于斷層上盤(pán)的滑坡危害較小,但是近年來(lái)變形也有所加劇。通過(guò)對(duì)典型滑坡三家寨滑坡的研究認(rèn)為由于前緣的臨空和近年來(lái)暴雨侵襲,導(dǎo)致三家寨滑坡前緣變形加劇,但是滑坡后部弱變形區(qū)變形特征不明顯,Flac3D數(shù)值模擬結(jié)果顯示在暴雨工況下前緣主滑方向位移較大,而后緣則以豎直方向位移為主,既表現(xiàn)為下錯(cuò)變形,這與滑坡實(shí)際情況一致。(4)對(duì)兩個(gè)典型滑坡運(yùn)用不平衡推力法進(jìn)行定量分析結(jié)果顯示,波色龍滑坡在天然工況下基本穩(wěn)定,在暴雨和地震工況下為欠穩(wěn)定;三家寨滑坡在天然工況下為穩(wěn)定狀態(tài),暴雨和地震工況下為穩(wěn)定～欠穩(wěn)定,但是其前緣的次級(jí)滑面在暴雨工況下為不穩(wěn)定,地震狀態(tài)下為欠穩(wěn)定。所以總體上F1斷層上盤(pán)滑坡穩(wěn)定性好于F1斷層下盤(pán)滑坡。
[Abstract]:Danba County Zhongluxiang landslide group is located on the left bank slope of small Jin He in Zhonglu Township, with a total of 9 landslides, large and small, in the direction of the basic coastal slope.In recent years, the deformation and destruction of the landslide group has intensified, resulting in the dislocation of the highway in Zhonglu Township, the cracking of houses near the landslide, the sliding destruction of farmland, and a large number of local collapses, which pose a great hidden danger to the life and property safety of the villagers in Zhonglu Township.It poses a serious threat to the normal traffic of Tongxiang Highway, and if the landslide as a whole will even block the channel of Little Jin He, the consequences will be unthinkable.In this paper, the spatial distribution, developmental characteristics, formation cause and sliding mode of Zhongluoxiang landslide group are analyzed by on-the-spot investigation.Then the typical landslide in the area is studied in detail to judge their current deformation and failure mechanism, and the deformation and failure mechanism of typical landslide is simulated by using Flac3D numerical simulation software.Finally, the stability of typical landslide is calculated by unbalanced thrust method.The main research contents and results of this paper are as follows: (1) based on the field investigation results and related literature, it is considered that the Zhongluxiang landslide group is a landslide group located in the upper and lower face of F1 fault.The number of landslides located in the upper face of F1 fault is more, the sliding mode is traction type, and the deformation and failure characteristics are smaller, while the number of landslides in the lower face of F1 fault is less, the sliding mode is bedded, and the characteristics of deformation and failure are obvious.Through the analysis of various internal and external causes of landslide formation, it is concluded that the failure mode of slope body in this area is the down-wall rock and soil mass sliding along the layer, and the upper wall landslide is mostly developed behind the bedrock cliff.The slide induced by the instability of the underlying rock or other factors shows that the downboard landslide is mainly an accumulation formed after the early bank slope collapse and slips under external factors) the landslide located in the fault footwall has been sliding obviously in recent years.Individual landslides have slipped as a whole.Through the study of typical landslide Boxelong landslide, it is considered that the stress of slope body is readjusted due to the influence of highway excavation in 2012, the slope body appears tensile cracks, and the slope foot produces plastic deformation.The subsequent heavy rainfall induced the partial resurrection of the Boselong landslide. The numerical simulation results also confirmed this judgment. Before the slope was excavated, the landslide was mainly a shallow slide.The landslide in the upper face of the fault is less harmful, but the deformation is also aggravated in recent years.Through the study of the typical landslide, Sanjiazhai landslide, it is believed that the front deformation of Sanjiazhai landslide is aggravated because of the front edge of the landslide and the heavy rain in recent years.However, the deformation characteristics of the weak deformation area at the back of the landslide are not obvious. The numerical simulation results of Flac3D show that the main slip direction of the front edge is larger under the heavy rain condition, and the vertical direction displacement is the main displacement in the back edge of the landslide.The results of quantitative analysis of two typical landslides by unbalanced thrust method show that the Boxelong landslide is basically stable under natural conditions and unstable under heavy rain and earthquake conditions.Sanjiazhai landslide is stable under natural condition, stable ~ unsteady under rainstorm and earthquake, but its secondary slip surface is unstable under rainstorm condition and unsteady under earthquake condition.Therefore, on the whole, the stability of the upper side landslide of F1 fault is better than that of F1 fault downboard landslide.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P642.22

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