本文選題：黃土滑坡　切入點(diǎn)：降雨　出處：《西安建筑科技大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：陜北地區(qū)是黃土滑坡的高發(fā)區(qū),給當(dāng)?shù)厝藗兊纳顜?lái)了無(wú)法想象的影響,同時(shí)也影響了當(dāng)?shù)氐慕?jīng)濟(jì)建設(shè)和各行各業(yè)的發(fā)展。我國(guó)巖土領(lǐng)域?qū)＜液蛯W(xué)者在預(yù)防和治理黃土滑坡問(wèn)題方面取得不菲的成績(jī),然而,關(guān)于陜北地區(qū)黃土滑坡與降雨的內(nèi)在機(jī)理進(jìn)行系統(tǒng)全面分析與研究的成果并不多見(jiàn)。隨著陜北地區(qū)資源開(kāi)發(fā)程度的提高和經(jīng)濟(jì)社會(huì)活動(dòng)的加劇,黃土高原水土流失、土壤退化、生態(tài)惡化等環(huán)境問(wèn)題日益突出,其中黃土滑坡問(wèn)題愈加嚴(yán)重,預(yù)防和治理黃土滑坡問(wèn)題,仍迫在眉睫。因此,本文以陜北黃土滑坡為研究對(duì)象,通過(guò)收集分析陜北地區(qū)的氣象資料與地質(zhì)條件,利用ABAQUS數(shù)值分析軟件,分別從降雨強(qiáng)度、降雨持時(shí)、降雨類(lèi)型及邊坡類(lèi)型四個(gè)方面進(jìn)行邊坡降雨入滲及穩(wěn)定性分析,研究降雨與滑坡之間的內(nèi)在聯(lián)系,揭示降雨誘發(fā)滑坡的內(nèi)在機(jī)理。并根據(jù)具體的黃土滑坡實(shí)例,進(jìn)一步驗(yàn)證降雨誘發(fā)黃土滑坡機(jī)理的合理性,為減少該地區(qū)黃土滑坡提供科學(xué)依據(jù)。本文主要研究?jī)?nèi)容如下:(1)通過(guò)分析陜北地區(qū)的黃土滑坡資料與氣象資料,獲取該地區(qū)黃土滑坡和降雨的時(shí)空分布規(guī)律。根據(jù)陜北地區(qū)的地質(zhì)構(gòu)造及巖體特征,本文建立兩種邊坡模型:純黃土邊坡模型與黃土-紅粘土邊坡模型,根據(jù)陜北地區(qū)的黃土及紅粘土的物理力學(xué)性質(zhì),選取合適的模型參數(shù)。(2)利用ABAQUS數(shù)值分析軟件進(jìn)行邊坡降雨入滲分析,選取10mm/d、25mm/d、50mm/d、75mm/d及100mm/d五種不同強(qiáng)度的降雨,分別從降雨強(qiáng)度、降雨持時(shí)、降雨類(lèi)型及邊坡類(lèi)型四個(gè)方面進(jìn)行邊坡降雨入滲研究。根據(jù)降雨模擬結(jié)果分別獲得降雨強(qiáng)度、降雨持時(shí)、降雨類(lèi)型及邊坡類(lèi)型與孔隙水壓力的關(guān)系趨勢(shì)線(xiàn),并擬合出對(duì)應(yīng)的數(shù)學(xué)表達(dá)式。(3)利用ABAQUS數(shù)值分析軟件進(jìn)行邊坡穩(wěn)定性分析,選取10mm/d、25mm/d、50mm/d、75mm/d及100mm/d五種不同強(qiáng)度的降雨,分別從降雨強(qiáng)度、降雨持時(shí)、降雨類(lèi)型及邊坡類(lèi)型四個(gè)方面進(jìn)行邊坡穩(wěn)定性研究。根據(jù)邊坡穩(wěn)定性模擬結(jié)果分別獲得降雨強(qiáng)度、降雨持時(shí)、降雨類(lèi)型及邊坡類(lèi)型與邊坡失穩(wěn)時(shí)的安全系數(shù)的關(guān)系趨勢(shì)線(xiàn),并擬合出對(duì)應(yīng)的數(shù)學(xué)表達(dá)式。(4)選取陜北地區(qū)降雨誘發(fā)滑坡的典型實(shí)例,利用ABAQUS數(shù)值分析軟件,建立邊坡模型,賦予合理的參數(shù),在降雨強(qiáng)度為15mm/d和降雨持時(shí)為10天的工況條件下,從降雨持時(shí)方面進(jìn)行降雨入滲及穩(wěn)定性分析,進(jìn)一步驗(yàn)證降雨對(duì)滑坡的影響。根據(jù)模擬結(jié)果分別獲得降雨持時(shí)與滲流速度及邊坡失穩(wěn)時(shí)的安全系數(shù)的關(guān)系趨勢(shì)線(xiàn),并擬合出對(duì)應(yīng)的數(shù)學(xué)表達(dá)式。
[Abstract]:Northern Shaanxi is an area with a high incidence of loess landslides, which has had an unimaginable impact on the lives of local people. At the same time, it also affects the local economic construction and the development of various industries. Our country's experts and scholars in the field of rock and soil have made great achievements in preventing and controlling the loess landslide, however, There are few results of systematic and comprehensive analysis and research on the inherent mechanism of loess landslide and rainfall in northern Shaanxi. With the development of resources and the aggravation of economic and social activities in northern Shaanxi, soil erosion and soil degradation in loess plateau. Environmental problems such as ecological deterioration are becoming more and more prominent, among which loess landslide is becoming more and more serious. It is still urgent to prevent and control loess landslide. Therefore, this paper takes loess landslide in northern Shaanxi as the research object. By collecting and analyzing the meteorological data and geological conditions in northern Shaanxi, using ABAQUS numerical analysis software, the slope infiltration and stability are analyzed from four aspects: rainfall intensity, rainfall duration, rainfall type and slope type, respectively. The internal relationship between rainfall and landslide is studied, and the inherent mechanism of landslide induced by rainfall is revealed, and the rationality of the mechanism of landslide induced by rainfall is further verified according to the concrete examples of loess landslide. In order to provide scientific basis for reducing loess landslide in this area, the main contents of this paper are as follows: 1) by analyzing loess landslide data and meteorological data in northern Shaanxi, The temporal and spatial distribution of loess landslide and rainfall in this area is obtained. According to the geological structure and rock mass characteristics in northern Shaanxi, two slope models are established: the pure loess slope model and the loess-red clay slope model. According to the physical and mechanical properties of loess and red clay in northern Shaanxi, the appropriate model parameters. (2) the slope rainfall infiltration analysis was carried out by ABAQUS numerical analysis software. Five different rainfall intensities of 10 mm / d, 25 mm / d, 50 mm / d and 100 mm / d were selected, respectively, from the rainfall intensity. According to rainfall simulation results, rainfall intensity, rainfall duration, slope type and pore water pressure are obtained. The corresponding mathematical expression is fitted out. (3) the slope stability analysis is carried out by using ABAQUS numerical analysis software. Five kinds of rainfall of different intensity are selected: 10 mm / d 25 mm / d 50 mm / d 75 mm / d and 100 mm / d respectively from rainfall intensity and rainfall duration. The slope stability is studied in four aspects: rainfall type and slope type. According to the results of slope stability simulation, the trend lines of relationship between slope safety factor and rainfall intensity, rainfall duration, rainfall type and slope type are obtained. Fitting the corresponding mathematical expression. 4) selecting the typical example of landslide induced by rainfall in northern Shaanxi, using ABAQUS numerical analysis software, the slope model is established, and the reasonable parameters are given. Under the condition that the rainfall intensity is 15 mm / d and the rainfall duration is 10 days, the rainfall infiltration and stability are analyzed from the point of rainfall duration. According to the simulation results, the relationship between rainfall duration, seepage velocity and slope safety factor is obtained, and the corresponding mathematical expression is obtained.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU444;P642.22

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉博;孫樹(shù)林;劉俊;王恩喜;陳懌e，

本文編號(hào)：1629644