本文選題：高速公路　切入點(diǎn)：路塹邊坡　出處：《石家莊鐵道大學(xué)》2015年碩士論文

【摘要】：我國是一個多山的國家,山地占總面積的60%以上,尤其是西部地區(qū),高山峽谷等復(fù)雜的地形給工程建設(shè)帶來了眾多的難題。為加快西部地區(qū)的發(fā)展,2000年國家制定了西部大開發(fā)戰(zhàn)略,近年來,隨著西部大開發(fā)戰(zhàn)略的推進(jìn),越來越多的高速公路開工建設(shè),而這些高等級公路的建設(shè)不可避免地面臨著深挖路塹高邊坡。廣西三江至柳州高速公路是廣西壯族自治區(qū)高速公路網(wǎng)“4縱6橫3支線”的重要組成部分,是三江到北海高速公路的起始段。以三柳高速公路典型路塹高邊坡為研究對象,先根據(jù)現(xiàn)場地質(zhì)調(diào)查及室內(nèi)巖土物理力學(xué)試驗(yàn)、原位測試,定性評價天然邊坡的整體穩(wěn)定性,提出開挖的合理建議,然后基于FLAC3D有限差分軟件,采用有限差分強(qiáng)度折減法對天然邊坡和路塹開挖邊坡進(jìn)行數(shù)值模擬分析,得到邊坡在不同狀態(tài)下的剪應(yīng)變、塑性區(qū)和變形特征,為邊坡開挖和支護(hù)提供依據(jù)。通過理論分析、穩(wěn)定性定性分析和數(shù)值模擬,結(jié)果表明:(1)根據(jù)現(xiàn)場工程地質(zhì)情況調(diào)查,天然狀態(tài)下該邊坡處于穩(wěn)定狀態(tài),主要巖土體從上至下依次為粉質(zhì)粘土、全風(fēng)化黑色絹云千枚巖夾砂巖、強(qiáng)風(fēng)化黑色絹云千枚巖夾設(shè)宴、微風(fēng)化黑色絹云千枚巖夾砂巖;(2)采用有限差分強(qiáng)度折減法對天然邊坡的FLAC3D數(shù)值分析表明,邊坡穩(wěn)定性系數(shù)為1.22,處于穩(wěn)定狀態(tài),坡體位移較小,塑性區(qū)沒有貫通,沒有出現(xiàn)明顯的滑動面;(3)路塹開挖后,邊坡的穩(wěn)定性系數(shù)降至0.81,邊坡失穩(wěn),公路內(nèi)側(cè)高邊坡塑性區(qū)貫通,形成圓弧形滑面,坡腳擠壓隆起,坡頂向下滑動,產(chǎn)生滑坡;(4)建議對邊坡采取分級放坡開挖,公路內(nèi)側(cè)邊坡采用錨桿框架梁支護(hù),外側(cè)邊坡采用植被護(hù)坡。
[Abstract]:China is a mountainous country, which accounts for more than 60% of the total area, especially in the western region, mountain canyons and other complex terrain has brought a lot of problems to the engineering construction.In order to speed up the development of the western region, the state formulated the strategy for the large-scale development of the western region in 2000. In recent years, with the development of the western region strategy, more and more highways have started to build.The construction of these high-grade highways is inevitably faced with deep excavation cutting high slope.Guangxi Sanjiang to Liuzhou expressway is an important part of Guangxi Zhuang Autonomous region highway network "4 longitudinal 6 horizontal 3 branch line", is the beginning section of Sanjiang to Beihai Expressway.Taking the typical cutting high slope of Sanliu Expressway as the research object, according to the field geological investigation and the indoor geotechnical physical and mechanical test, in situ test, the overall stability of the natural slope is evaluated qualitatively, and the reasonable suggestion of excavation is put forward.Based on the FLAC3D software, the shear strain, plastic zone and deformation characteristics of the natural slope and the cut excavation slope are obtained by using the finite difference strength reduction method, and the shear strain, plastic zone and deformation characteristics of the slope under different conditions are obtained.It provides basis for slope excavation and support.Through theoretical analysis, qualitative stability analysis and numerical simulation, the results show that according to field engineering geological investigation, the slope is in a stable state in natural state, and the main rock and soil mass is silty clay from top to bottom.Fully weathered black sericite phyllite intercalated sandstone, strongly weathered black sericite phyllite intercalated with banquet, breeze black sericite phyllite intercalated sandstone Kuo 2) the FLAC3D numerical analysis of natural slope by finite difference strength reduction method shows that,The stability coefficient of the slope is 1.22. The slope is in a stable state, the displacement of the slope is small, the plastic zone is not through, and there is no obvious slip surface. After excavation, the stability coefficient of the slope decreases to 0.81, the slope is unstable and the plastic zone of the high slope inside the highway is through.It is suggested that the slope should be excavated by stages, the inside side of the highway should be supported by anchor frame beam, and the outside slope should be protected by vegetation.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.14

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