【摘要】：本文以重慶市萬州區(qū)三灣公路邊坡危巖為典型代表進(jìn)行分析,采用現(xiàn)場調(diào)查、數(shù)值模擬方法、剛體極限平衡分析法、運動學(xué)等研究手段,對重慶地區(qū)危巖失穩(wěn)崩塌的危巖體特點、失穩(wěn)模式、危巖穩(wěn)定性、崩塌落石運動路徑等問題進(jìn)行深入研究,最后針對不同情況的危巖體,提出簡單的治理措施建議。 研究的主要內(nèi)容： ①重慶地區(qū)危巖體特點 重慶地區(qū)地質(zhì)巖性組合以軟硬巖互層為主要特征,在長期風(fēng)化營力和重力作用下,容易發(fā)生差異風(fēng)化,產(chǎn)生拉裂變形,形成危巖體。本文主要研究砂泥巖互層邊坡的破壞方式與穩(wěn)定性分析。 ②危巖體分布規(guī)律及失穩(wěn)模式分析 工程地質(zhì)環(huán)境條件與危巖體發(fā)育特征與分布規(guī)律、變形破壞模式以及危巖體穩(wěn)定性之間有著重要的聯(lián)系,危巖體的形成是內(nèi)在條件與外在條件共同作用的結(jié)果,本文對研究區(qū)的各種工程地質(zhì)環(huán)境條件都做了較詳細(xì)的闡述。 勘查區(qū)危巖的失穩(wěn)破壞方式主要為滑移式、傾倒式和墜落式三種基本類型。本文對每種失穩(wěn)模式都做了比較詳細(xì)的分析。 ③危巖體穩(wěn)定性分析方法研究 進(jìn)行危巖體穩(wěn)定性評價方法與影響危巖體穩(wěn)定性的因素分析,從危巖形態(tài)及變形特征、控制危巖的結(jié)構(gòu)面特征入手進(jìn)行赤平極射投影圖法分析,運用剛體極限平衡分析法進(jìn)行計算分析。 根據(jù)研究區(qū)邊坡的工程地質(zhì)條件、危巖體變形破壞模式、穩(wěn)定性和危險性的綜合評價,研究區(qū)邊坡危巖體在天然狀態(tài)下基本處于基本穩(wěn)定～欠穩(wěn)定狀態(tài),有可能失穩(wěn)。 ④研究區(qū)危巖體失穩(wěn)運動路徑分析 通過對落石路徑的驗算與模擬,可以得到落石過程的運動路徑、最大落石距離、碰撞動能、彈跳高度等,但是,模擬過程計算量明顯減小,省時省力,而計算需要過程驗算與判斷,費時費力；另外,路徑模擬還可以方便的進(jìn)行攔擋設(shè)置,進(jìn)行落石路徑模擬,可以方便的看出防治措施的效果,并為危巖防治提供依據(jù)。 Rocfall軟件可以較好較快地為危巖防治提供依據(jù),適時,可以運用計算方式進(jìn)行輔助驗算,以提高其準(zhǔn)確性。 ⑤危巖體防治措施研究 危巖治理措施采用錨固、清除、支撐、封閉巖腔等綜合治理方法,對危巖頂部的裂隙進(jìn)行封閉處理,并在卸荷帶以外修截排水溝,坡腳修筑攔石網(wǎng)或攔石墻等。進(jìn)行防護(hù)工程方案對比,比較充分的論證防護(hù)措施的可行性。
[Abstract]:In this paper, the dangerous rock of Sanwan highway slope in Wanzhou district of Chongqing is taken as the typical representative. The methods of field investigation, numerical simulation, rigid body limit equilibrium analysis, kinematics and so on are adopted. In this paper, the characteristics of dangerous rock mass, instability mode, stability of dangerous rock, movement path of rockfall and so on in Chongqing area are studied in depth. At last, according to different situations of dangerous rock mass, some simple control measures are put forward. The main contents of the study: 1the characteristics of dangerous rock mass in Chongqing area; the geological lithologic assemblage in Chongqing area is characterized by soft and hard rock interbeds; under the action of long-term weathering and gravity, it is easy to occur differential weathering, resulting in tensile and fracture deformation. A dangerous rock mass is formed. This paper mainly studies the failure mode and stability analysis of sand-mudstone interbedded slope. (2) Analysis of distribution law and instability mode of dangerous rock mass. There is an important relationship between engineering geological environment condition and development and distribution law of dangerous rock mass, deformation and failure mode and stability of dangerous rock mass. The formation of dangerous rock mass is the result of the interaction of internal and external conditions. In this paper, all kinds of engineering geological environment conditions in the study area are described in detail. The main failure modes of dangerous rock in the exploration area are slip type, overturning type and falling type. In this paper, every instability mode is analyzed in detail. (3) the stability analysis method of dangerous rock mass is studied, and the evaluation method of dangerous rock mass stability and the factors influencing the stability of dangerous rock mass are analyzed, from the view of dangerous rock shape and deformation characteristics, Starting with controlling the structural surface characteristics of dangerous rock, the projection method of polar projection is analyzed, and the rigid body limit equilibrium analysis method is used to calculate and analyze. According to the engineering geological conditions of slope in the study area, deformation and failure mode of dangerous rock mass, stability and risk comprehensive evaluation, the slope dangerous rock mass in the study area is basically stable or unstable in natural state, and it is likely to be unstable. 4The analysis of unstable movement path of dangerous rock mass in the study area can get the movement path of rock falling process, the maximum distance of falling rock, the kinetic energy of collision, the height of bouncing and so on by checking and simulating the path of falling rock. The computation amount of the simulation process is obviously reduced, and the time-saving and labor-saving, and the calculation requires the process checking calculation and judgment, which is time-consuming and laborious. In addition, the path simulation can also conveniently set up the blocking and drop the rock path, which can easily see the effect of the prevention and control measures, and provide the basis for the prevention and control of dangerous rocks. The Rocfall software can provide the basis for the prevention and cure of dangerous rock quickly. At the right time, the calculation method can be used to carry out the auxiliary checking calculation to improve its accuracy. (5) Prevention and control measures of dangerous rock mass; the control measures of dangerous rock adopt the comprehensive treatment methods of anchoring, clearing, supporting, sealing rock cavity, etc., to seal the cracks on the top of dangerous rock, and to repair drainage ditches outside the unloading zone. A stone-blocking net or wall, etc., is built at the foot of the slope. The feasibility of the protective measures is fully demonstrated by comparing the protective engineering schemes.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.14

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