本文選題：飽和-非飽和　切入點(diǎn)：降雨入滲　出處：《昆明理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：露天礦邊坡的穩(wěn)定直接關(guān)系到礦山工人的安全與企業(yè)的經(jīng)濟(jì)效益,是保證礦山企業(yè)正常生產(chǎn)的先決條件。邊坡發(fā)生失穩(wěn)的原因是多方面的,而降雨是發(fā)生滑坡的常遇誘導(dǎo)因素。本文在國(guó)內(nèi)外學(xué)者研究的基礎(chǔ)上,以曼家寨東幫采場(chǎng)軟巖邊坡為研究對(duì)象,針對(duì)其在降雨過(guò)后曾發(fā)生局部垮塌、出現(xiàn)坡面裂縫現(xiàn)象,結(jié)合飽和-非飽和滲流理論、飽和-非飽和抗剪強(qiáng)度理論,進(jìn)行相關(guān)物理力學(xué)試驗(yàn),分析降雨作用下該露天礦邊坡失穩(wěn)破壞的機(jī)理。選取典型區(qū)域運(yùn)用Geo-studio中的SEEP模塊計(jì)算降雨條件下該邊坡的滲流場(chǎng),分析降雨過(guò)程中邊坡入滲的規(guī)律。以滲流計(jì)算為前提,結(jié)合Fredlund和Morgenstern提出的飽和-非飽和抗剪強(qiáng)度理論,運(yùn)用Flac3d對(duì)邊坡降雨條件下的穩(wěn)定性及滑動(dòng)面進(jìn)行計(jì)算,分析降雨對(duì)邊坡穩(wěn)定性的影響規(guī)律。本文的主要研究?jī)?nèi)容如下:(1)通過(guò)查閱相關(guān)文獻(xiàn),了解國(guó)內(nèi)外對(duì)降雨入滲下邊坡穩(wěn)定的研究現(xiàn)狀�？偨Y(jié)降雨入滲下邊坡穩(wěn)定性影響的理論:以達(dá)西定律與能量守恒定律為基礎(chǔ),推導(dǎo)出適用于軟巖邊坡的飽和-非飽和滲流微分方程,選取相應(yīng)的定解條件;歸納總結(jié)了適用于軟巖邊坡的飽和-非飽和抗剪強(qiáng)度理論。為后續(xù)數(shù)值模擬分析提供理論基礎(chǔ)。(2)研究區(qū)工程巖體力學(xué)特性與滲透特性分析:基于曼家寨邊坡露天開(kāi)采技術(shù)條件,結(jié)合邊坡現(xiàn)場(chǎng)調(diào)研,通過(guò)對(duì)工程巖體開(kāi)展室內(nèi)與現(xiàn)場(chǎng)試驗(yàn),確定合理的邊坡宏觀(guān)巖體力學(xué)參數(shù)與滲透參數(shù),為后續(xù)數(shù)值模擬分析提供可靠的計(jì)算參數(shù)。(3)降雨條件下邊坡瞬態(tài)滲流場(chǎng)滲流特性分析:結(jié)合工程區(qū)域降雨特征,運(yùn)用Geo-studio軟件的SEEP模塊,對(duì)不同降雨強(qiáng)度、不同降雨持續(xù)時(shí)間下邊坡巖體暫態(tài)飽和區(qū)、孔隙水壓力分布的變化規(guī)律進(jìn)行模擬分析。研究認(rèn)為:降雨條件下邊坡表層區(qū)域受降雨影響嚴(yán)重,影響區(qū)域與影響程度受降雨時(shí)間與降雨強(qiáng)度共同控制;暫態(tài)飽和區(qū)是考慮降雨作用下邊坡失穩(wěn)的重要因素,降雨歷時(shí)相同時(shí),降雨強(qiáng)度越大形成暫態(tài)飽和區(qū)面積越大;邊坡受降雨影響的范圍首先是坡腳,然后是坡頂,最后才向坡體內(nèi)部延伸。(4)降雨入滲對(duì)邊坡穩(wěn)定性影響的分析:將滲流場(chǎng)的孔隙水壓力引入基于飽和-非飽和抗剪強(qiáng)度理論的穩(wěn)定性計(jì)算中,運(yùn)用Flac3D強(qiáng)度折減法對(duì)降雨條件下邊坡的穩(wěn)定性進(jìn)行分析,其中重點(diǎn)考慮不同降雨時(shí)間下的位移場(chǎng)、潛在滑移面、安全系數(shù)的變化,并對(duì)不同降雨條件下邊坡的穩(wěn)定性進(jìn)行了評(píng)價(jià),為決策者提供了可靠的理論依據(jù)。(5)根據(jù)對(duì)該邊坡降雨條件下滲流計(jì)算與穩(wěn)定性計(jì)算結(jié)果,針對(duì)降雨條件下邊坡的潛在危害,提出相應(yīng)的防護(hù)治理措施。
[Abstract]:The stability of open pit slope is directly related to the safety of mine workers and the economic benefits of enterprises, and is a prerequisite to ensure the normal production of mining enterprises. Based on the research of domestic and foreign scholars, this paper takes the soft rock slope of Manjiazhai East Slope as the research object, aiming at the phenomenon of local collapse and slope surface crack after rainfall. Combined with saturated-unsaturated seepage theory and saturated-unsaturated shear strength theory, relevant physical and mechanical tests were carried out. This paper analyzes the mechanism of slope instability and failure under rainfall. The seepage field of the slope under rainfall condition is calculated by using SEEP module of Geo-studio in typical area, and the law of slope infiltration during rainfall is analyzed. Combined with the saturated-unsaturated shear strength theory proposed by Fredlund and Morgenstern, the stability and sliding surface of slope under rainfall condition are calculated by Flac3d. The main contents of this paper are as follows: 1. To understand the research status of slope stability under rainfall infiltration at home and abroad, summarize the theory of slope stability under rainfall infiltration: based on Darcy's law and energy conservation law, The saturated-unsaturated seepage differential equation suitable for soft rock slope is derived, and the corresponding definite solution condition is selected. The saturated-unsaturated shear strength theory suitable for soft rock slope is summarized, which provides a theoretical basis for subsequent numerical simulation analysis. The mechanical and permeable characteristics of engineering rock mass in the study area are analyzed: based on the technical conditions of open-pit mining of Manjiazhai slope, Based on the field investigation of the slope, through the laboratory and field tests on the engineering rock mass, the reasonable mechanical parameters and permeation parameters of the slope macroscopic rock mass are determined. In order to provide reliable calculation parameters for subsequent numerical simulation analysis, the seepage characteristics of transient seepage field in slope under rainfall condition are analyzed. According to the rainfall characteristics of engineering area, the SEEP module of Geo-studio software is used to analyze the different rainfall intensity. The variation law of pore water pressure distribution in transient saturated area of slope rock mass under different rainfall duration is simulated and analyzed. It is considered that the surface area of slope is seriously affected by rainfall under rainfall condition. The influence area and influence degree are controlled by rainfall time and rainfall intensity together; transient saturation region is an important factor of slope instability under the consideration of rainfall. When rainfall duration is the same, the larger rainfall intensity is, the larger the area of transient saturation zone is. The slope is affected by rainfall first at the foot of the slope, then at the top of the slope. Finally, the influence of rainfall infiltration on slope stability is analyzed. The pore water pressure of seepage field is introduced into the stability calculation based on saturated-unsaturated shear strength theory. The stability of slope under rainfall condition is analyzed by Flac3D strength reduction method, in which the variation of displacement field, potential slip plane and safety factor under different rainfall time are taken into account. The stability of slope under different rainfall conditions is evaluated, which provides a reliable theoretical basis for decision-makers. According to the results of seepage calculation and stability calculation under rainfall condition, the potential damage of slope under rainfall condition is pointed out. The corresponding protective measures are put forward.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD854.6

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本文編號(hào)：1610512