【摘要】：近年來,隨著工程建設(shè)數(shù)量不斷增多,規(guī)模也越來越龐大,人類對山體邊坡的改造、利用也日益增多。但是由于山體邊坡,特別是碎裂巖體邊坡,其性質(zhì)與土質(zhì)邊坡和其它巖質(zhì)邊坡不同,再加上對碎裂巖體邊坡認(rèn)識的局限性,在施工過程中或施工完成后,碎裂巖體容易發(fā)生風(fēng)化和降水快速入滲,可能再次誘發(fā)邊坡失穩(wěn)。因此,需要對碎裂巖體邊坡進(jìn)行全面的認(rèn)識,針對不同地層、巖性、風(fēng)化破碎程度的碎裂巖體邊坡,確定其破壞模式,進(jìn)行多種工況的穩(wěn)定性評價,從而提出對應(yīng)的治理方案。本文將寶華鎮(zhèn)南北通道路塹碎裂巖體邊坡作為研究對象,根據(jù)該段特殊的地形地貌、水文地質(zhì)條件,進(jìn)行工程地質(zhì)分區(qū)和亞區(qū)劃分,對亞區(qū)內(nèi)不同類型的碎裂巖體邊坡進(jìn)行工程地質(zhì)分析,確定極軟巖邊坡的滑動面,引入可靠度理論進(jìn)行反分析,從而得到結(jié)構(gòu)面的強(qiáng)度參數(shù)。本文的主要認(rèn)識及研究成果如下:(1)通過現(xiàn)場工程地質(zhì)勘查,對寶華鎮(zhèn)南北通道路塹碎裂巖體邊坡工程地質(zhì)分析,確定各地層的巖性及地層間的差異性,進(jìn)行工程地質(zhì)分區(qū)和亞區(qū)劃分。(2)根據(jù)碎裂巖體邊坡所發(fā)生破壞部位的不同,將碎裂巖體邊坡的破壞模式分為淺表崩塌破壞及坡體深層滑動破壞。對亞區(qū)應(yīng)用節(jié)理統(tǒng)計、軟件分析等方法,確定各亞區(qū)的碎裂巖體邊坡具體破壞模式,并提出可行的治理方案。(3)根據(jù)龍?zhí)督M及孤峰組邊坡巖體破碎性質(zhì)軟弱的特點(diǎn),將其概化為類土質(zhì)邊坡,假定其發(fā)生圓弧滑動,采用極限平衡理論對其穩(wěn)定性進(jìn)行分析,多段邊坡穩(wěn)定性安全系數(shù)接近極限平衡狀態(tài),沿著圓弧滑動面發(fā)生整體滑動。雖然其中有兩個臺階未發(fā)生滑動時,其穩(wěn)定性系數(shù)大于1,但是由于模擬時此邊坡仍處于卸荷階段,此巖體的滲透系數(shù)較小,降雨入滲尚未達(dá)到坡體內(nèi)部,在計算時沒有考慮到降雨作用,但是此種邊坡處于穩(wěn)定狀態(tài)只是暫時的,因此該種情況也是非常危險的�？傮w來看,龍?zhí)督M及孤峰組地層構(gòu)成的破碎巖體邊坡整體穩(wěn)定性較差,處于不穩(wěn)定狀態(tài)。(4)運(yùn)用可靠度理論和破壞概率法對高家邊組泥巖楔形體破壞邊坡進(jìn)行反分析,得出臨界狀態(tài)邊坡巖體的力學(xué)強(qiáng)度參數(shù),計算結(jié)果表明,以破壞概率給出的結(jié)構(gòu)面力學(xué)參數(shù)更加符合工程的實際情況,可以供防治工程設(shè)計使用。
[Abstract]:In recent years, with the increasing number and scale of engineering construction, the utilization of mountain slope is increasing day by day. However, because the nature of mountain slope, especially broken rock slope, is different from that of soil slope and other rock slope, in addition to the limitation of understanding of broken rock slope, in the process of construction or after the completion of construction, the nature of mountain slope is different from that of soil slope and other rock slope. The fractured rock mass is prone to weathering and rapid infiltration of precipitation, which may induce slope instability again. Therefore, it is necessary to make a comprehensive understanding of the fractured rock slope, to determine the failure mode of the fractured rock slope with different strata, lithology and weathering degree, to evaluate the stability of various working conditions, and to put forward the corresponding treatment scheme. In this paper, according to the special terrain and geomorphology, hydrogeological conditions, engineering geological zoning and subarea division are carried out on the slope of fractured rock mass in the north and south passageway of Baohua town. The engineering geological analysis of different types of fractured rock slope in the sub-area is carried out to determine the sliding surface of the extreme soft rock slope, and the reliability theory is introduced to carry out the back analysis, so as to obtain the strength parameters of the structural plane. The main knowledge and research results of this paper are as follows: (1) through the field engineering geological survey, the engineering geology analysis of the rock slope in the north and south passageway of Baohua town is carried out, and the lithology and the difference between the strata are determined. (2) according to the different failure sites of the fractured rock slope, the failure mode of the fractured rock slope is divided into shallow collapse failure and deep sliding failure. By using the methods of joint statistics and software analysis, the concrete failure mode of broken rock slope in each subregion is determined, and the feasible treatment scheme is put forward. (3) according to the characteristics of the broken rock mass of Longtan formation and Gufeng formation, the rock mass is weak. The stability of the slope is analyzed by the limit equilibrium theory. The safety factor of the multi-section slope is close to the limit equilibrium state and the whole slip occurs along the arc sliding surface. Although the stability coefficient of the slope is greater than 1 when two of the steps are not sliding, the permeability coefficient of the rock mass is small because the slope is still in the unloading stage when the slope is simulated, and the rainfall infiltration has not reached the inside part of the slope. Rainfall is not taken into account in the calculation, but the stability of the slope is only temporary, so the situation is very dangerous. As a whole, the fractured rock slope composed of Longtan formation and Gufeng formation is in a unstable state because of its poor overall stability. (4) using reliability theory and failure probability method, back analysis of the wedge failure slope of high Jiabian formation mudstone is carried out. The mechanical strength parameters of critical slope rock mass are obtained. The calculated results show that the mechanical parameters of the structural plane given by the failure probability are more in line with the actual conditions of the engineering and can be used in the design of the prevention and cure project.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.1

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