本文選題：運(yùn)動(dòng)機(jī)理 + 多序次黃土滑坡　； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：多序次黃土滑坡是黃土滑坡的一種特殊類(lèi)型,表現(xiàn)為同一塬段斜坡發(fā)生多起滑動(dòng),滑坡體現(xiàn)了一定的復(fù)發(fā)性,在時(shí)空上體現(xiàn)了多序次的特點(diǎn)。多序次黃土滑坡的發(fā)生使得塬邊不斷縮減,既威脅了塬面上的居民生產(chǎn)生活,也造成了塬下土地資源的損失和基礎(chǔ)設(shè)施的損壞。本文選取涇陽(yáng)南塬多序次黃土滑坡作為典型代表,在系統(tǒng)歸納多序次黃土滑坡的研究現(xiàn)狀和研究成果的基礎(chǔ)上,分析了研究區(qū)內(nèi)地質(zhì)環(huán)境背景及涇陽(yáng)南塬多序次黃土滑坡的運(yùn)動(dòng)特征及滑坡特征參數(shù),并運(yùn)用PFC顆粒離散元數(shù)值模擬軟件模擬了涇陽(yáng)南塬多序次黃土滑坡的三個(gè)序次的滑動(dòng)過(guò)程,探討了涇陽(yáng)南塬多序次黃土滑坡的運(yùn)動(dòng)機(jī)理,研究成果對(duì)于多序次黃土滑坡的機(jī)理分析及防治具有一定的指導(dǎo)意義。本文主要研究?jī)?nèi)容及結(jié)論如下:(1)通過(guò)野外現(xiàn)場(chǎng)調(diào)查,結(jié)合遙感解譯資料:研究區(qū)內(nèi)有14處斜坡發(fā)生過(guò)多序次的破壞,形成了 38起以上的滑動(dòng),其中有14處發(fā)生過(guò)2起以上的滑動(dòng),6處3起以上的滑動(dòng),2處發(fā)生4起滑動(dòng)。根據(jù)滑坡發(fā)生的力學(xué)機(jī)制可以將涇陽(yáng)南塬黃土滑坡分為黃土流滑和黃土滑動(dòng)兩類(lèi)。按照滑坡發(fā)育的先后順序可將研究區(qū)多序次黃土滑坡劃分為三類(lèi):流滑-滑動(dòng)-滑動(dòng)型、流滑-流滑-滑動(dòng)型和滑動(dòng)-流滑型。(2)利用統(tǒng)計(jì)分析的方法,對(duì)涇陽(yáng)南塬黃土滑坡特征參數(shù)進(jìn)行了分析,結(jié)果表明:隨著滑動(dòng)序次的遞增,滑動(dòng)體積逐漸遞減,剪出口位置也會(huì)逐漸升高,滑坡的滑距顯著縮短,后序次滑動(dòng)破壞位置多發(fā)生在第一期滑動(dòng)的后緣位置中部及后緣兩側(cè)的斜坡位置。(3)利用PFC顆粒流軟件模擬涇陽(yáng)南塬多序次黃土滑坡運(yùn)動(dòng)過(guò)程結(jié)果表明:涇陽(yáng)南塬黃土滑坡發(fā)生第一起滑動(dòng)時(shí),多具有高速遠(yuǎn)程的特征,在高速滑體的前端存在強(qiáng)烈的沖擊作用,滑體前端物質(zhì)與階地地層物質(zhì)碰撞會(huì)激起涌浪般的塵浪,這些現(xiàn)象都是由于“鏟”作用引起的,高速運(yùn)動(dòng)的滑體向前端推擠階地地層,刮蝕階地物質(zhì)并裹挾其共同向前運(yùn)動(dòng)。區(qū)內(nèi)的黃土滑坡在滑動(dòng)過(guò)程中存在一定的液化效應(yīng),高速運(yùn)動(dòng)滑體的沖擊作用下,滑動(dòng)面附近土體充分液化,摩擦系數(shù)降低,阻力減小甚至全部喪失。刮鏟效應(yīng)和液化效應(yīng)都具有增大堆積體最大運(yùn)移距離的作用。(4)研究得出涇陽(yáng)南塬多序次黃土滑坡的運(yùn)動(dòng)機(jī)理主要為:灌溉誘滑、堵水促滑、刮鏟促滑及滑床觸變液化促滑。滑坡發(fā)生滑動(dòng)時(shí)滑體重力勢(shì)能較多地轉(zhuǎn)化為動(dòng)能,使得滑體以很大的速度沖向階地層,運(yùn)動(dòng)過(guò)程中由于刮鏟效應(yīng)和液化效應(yīng),堆積體的運(yùn)移具有遠(yuǎn)程的特點(diǎn)。
[Abstract]:Multi-order loess landslide is a special type of loess landslide, which is characterized by multiple slippage on the slope of the same plateau, which reflects the recurrence of the landslide and the characteristics of multi-order in time and space. The occurrence of multiple sequential loess landslides makes the edge of the plateau shrink, which not only threatens the production and life of residents on the plateau, but also results in the loss of land resources and the damage of infrastructure under the plateau. In this paper, we select the multi-order loess landslide as the typical representative, on the basis of systematically summing up the present research situation and the research results of the multi-order sub-loess landslide. The background of geological environment in the study area and the movement characteristics and landslide characteristic parameters of multi-sequence loess landslide in the south plateau of Jingyang are analyzed. Using the PFC particle discrete element numerical simulation software, the sliding process of the multi-order loess landslide in Jingyang Nanyuan is simulated, and the motion mechanism of the multi-sequence loess landslide in the south plateau of Jingyang is discussed. The research results have certain guiding significance for the mechanism analysis and prevention of multiple sequence loess landslide. The main contents and conclusions of this paper are as follows: (1) based on field investigation and remote sensing interpretation data, there are 14 slopes in the study area which have been destroyed in many order, resulting in more than 38 slips. Among them, there were more than 2 slips in 14 places, 6 slips in 6, 3 slippages in 3 and 4 slippages in 2 places. According to the mechanical mechanism of landslide occurrence, loess landslide can be divided into loess flow slip and loess slide. According to the sequence of landslide development, the multi-sequence subloess landslide in the study area can be divided into three categories: fluid-slip type, fluid-slip type and glide-flow slip type. The characteristic parameters of loess landslide in the south plateau of Jingyang are analyzed. The results show that with the increase of sliding order, the sliding volume decreases gradually, the shear exit position increases gradually, and the slip distance of the landslide is shortened significantly. The post-sequence subslip failure location mostly occurred in the slope position of the middle part of the first stage slip and the two sides of the rear edge.) the simulation of the motion process of the multi-sequence sub-loess landslide in Jingyang South tableland by PFC particle flow software shows that: Jingyang South tableland is the south plateau of Jingyang. When the first slide occurred in the loess landslide, Most of them have the characteristics of high speed and long distance. There is a strong impact on the front end of the high speed slippery body. The collision between the front part of the slide body and the terrace material will arouse the billowing wave. These phenomena are all caused by the "shovel" action. The sliding body with high speed pushes the terrace to the front and erodes the terrace material and carries it forward together. There is a liquefaction effect in the sliding process of loess landslide in the region. Under the impact of high speed moving sliding body, the soil near the sliding surface is fully liquefied, the friction coefficient is reduced, and the resistance is reduced or even lost. The research shows that the motion mechanism of multi-sequence loess landslide in south plateau of Jingyang is mainly as follows: irrigation induced slip, water plugging promoting slide, scraping shovel promoting slide and sliding by tactile liquefaction of sliding bed. When the landslide occurs, the gravity potential energy of the sliding body is mostly converted into kinetic energy, which causes the sliding body to rush to the strata at a high speed. During the process of movement, the migration of the accumulated body has the characteristics of remote because of the effect of scraping and liquefaction.
【學(xué)位授予單位】：西安科技大學(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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