【摘要】：類土質(zhì)邊坡是當(dāng)前邊坡領(lǐng)域的一種新型邊坡，屬于人工邊坡的范疇，本文研究的類土質(zhì)邊坡是通過開挖天然地面形成的路基。在邢汾高速類土質(zhì)邊坡的一次削坡結(jié)束后，土體受到了一定的擾動使得一部分邊坡發(fā)生了輕微的垮塌現(xiàn)象。為保證工程的安全性，決定進(jìn)行二次削坡。 作者以邢汾高速類土質(zhì)路塹高邊坡穩(wěn)定性分析與支護(hù)研究項目為依托，經(jīng)過現(xiàn)場勘察，總結(jié)了地層巖性、工程地質(zhì)特征，建立二維FLAC-2D節(jié)理化模型。通過現(xiàn)場勘察—節(jié)理分析—數(shù)值模擬—穩(wěn)定性分析這一基本研究方法，，選取九組代表性邊坡，對類土質(zhì)路塹邊坡開挖進(jìn)行模擬，從理論角度對比了在兩組節(jié)理的共同作用下一、二次削坡前后路塹應(yīng)力場、位移場和安全系數(shù)，探究邊坡的穩(wěn)定性。希望對日后的實(shí)際工程實(shí)踐提供一定的借鑒。 類土質(zhì)路塹邊坡內(nèi)部存在有軟弱結(jié)構(gòu)面和節(jié)理面，并對其穩(wěn)定性起主要控制作用。目前，F(xiàn)LAC軟件大部分應(yīng)用于處理簡單層理邊坡的分析中，在處理包含不同巖質(zhì)多組節(jié)理的復(fù)雜邊坡上存在一定的局限性。本文在運(yùn)算過程中采取了“不同節(jié)理分開建模，數(shù)據(jù)分析權(quán)重求和”的方法進(jìn)行數(shù)據(jù)處理，通過對一、二次削坡前后坡體監(jiān)測點(diǎn)的位移場和應(yīng)力場進(jìn)行對比分析，并綜合安全系數(shù)，得出了二次削坡能夠提高此邊坡坡體穩(wěn)定性的重要結(jié)論。
[Abstract]:The soil-like slope is a new type of slope in the field of slope at present and belongs to the category of artificial slope. The soil-like slope studied in this paper is a subgrade formed by excavation of natural ground. At the end of a slope cutting at Xingfen high speed soil-like slope the soil was disturbed to a certain extent and some of the slopes collapsed slightly. In order to ensure the safety of the project, it was decided to cut the slope twice. Based on the research project of stability analysis and support of high speed soil-like cutting slope in Xingfen, the author summarizes the stratigraphic lithology and engineering geological characteristics, and establishes a two-dimensional physical and chemical model of FLAC-2D joint. Through the basic research method of field survey, joint analysis, numerical simulation and stability analysis, nine groups of representative slopes are selected to simulate the excavation of soil-like cutting slopes. The stress field, displacement field and safety factor of the cutting before and after the second slope cutting are studied to explore the stability of the slope. Hope to provide some reference to the practical engineering practice in the future. There are weak structural planes and joints in the slope of soil-like cutting, which play a major role in controlling the stability of the slope. At present, most of FLAC software is used in the analysis of simple bedding slope, and there are some limitations in the treatment of complex slope with different rock mass and multiple joints. In this paper, the method of "separate modeling of different joints and summation of data analysis weights" is adopted in the operation, and the displacement field and stress field of slope body monitoring points before and after the first and second slope cutting are compared and analyzed. By synthesizing the safety factor, it is concluded that the secondary slope cutting can improve the stability of the slope.
【學(xué)位授予單位】：河北工業(yè)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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