本文選題：片理化 + S220公路　； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：云南地區(qū)地質(zhì)構(gòu)造復(fù)雜,地質(zhì)災(zāi)害頻發(fā),其中由邊坡破壞造成的滑坡崩塌危害最大。通過對(duì)云南省寧蒗縣與永勝縣之間的S220公路的地質(zhì)調(diào)查,發(fā)現(xiàn)在兩縣分界處的邊坡巖體普遍片理化,且滑坡較多。片理化帶中“片理”對(duì)公路邊坡破壞起著控制作用。該段公路為三層的盤山公路,公路寬度4米左右,而且地形復(fù)雜,海拔達(dá)2500米以上,經(jīng)常發(fā)生滑坡容易造成交通中斷。因此選取該公路邊坡作為研究對(duì)象,開展了野外地質(zhì)調(diào)查、坡面測繪、滑坡統(tǒng)計(jì)等工作。對(duì)邊坡進(jìn)行實(shí)地調(diào)查發(fā)現(xiàn),調(diào)查區(qū)邊坡發(fā)育兩組到三組“片理”。在同一段邊坡中“片理”的產(chǎn)狀大致一致,具有規(guī)則性。同時(shí)在泥質(zhì)含量高的邊坡巖體中發(fā)育密集“片理”,“片理”面間距小于5厘米,而在泥質(zhì)含量低的邊坡巖體中“片理”面間距大于5厘米。片理化導(dǎo)致邊坡巖土體結(jié)構(gòu)發(fā)生破壞,成為碎裂結(jié)構(gòu)或散體結(jié)構(gòu),使其整體強(qiáng)度大大降低。具有片理化特征的邊坡,其破壞往往從邊坡發(fā)育“片理”的位置開始發(fā)生變形破壞,加速了邊坡的破壞進(jìn)程,成為控制邊坡巖體強(qiáng)度和邊坡的發(fā)展變形和破壞的主要因素。在研究區(qū)選取典型邊坡進(jìn)行測量,對(duì)其“片理”產(chǎn)狀進(jìn)行赤平投影,分析造成邊坡破壞的優(yōu)勢結(jié)構(gòu)面,并利用Flac3D采用強(qiáng)度折減法對(duì)片理化巖質(zhì)邊坡進(jìn)行應(yīng)力、應(yīng)變分析,得到邊坡巖體的應(yīng)力分布及變形特征以及可能發(fā)生破壞的部位。發(fā)現(xiàn)“片理”產(chǎn)狀對(duì)剪應(yīng)變?cè)隽康挠绊戄^大,當(dāng)“片理”產(chǎn)狀與坡面傾向一致時(shí),傾角的大小影響破壞的部位,傾向影響邊坡開挖后出現(xiàn)破壞的部位。并結(jié)合當(dāng)?shù)氐牡貙訋r性、氣候和邊坡工程地質(zhì)條件總結(jié)該地區(qū)片理化邊坡破壞過程。
[Abstract]:The geological structure is complex and geological disasters occur frequently in Yunnan area, in which landslide collapse caused by slope failure is the most harmful. Through the geological investigation of the S220 highway between Ninglang County and Yongsheng County, Yunnan Province, it is found that the slope rock mass at the boundary of the two counties is generally physical and chemical, and there are more landslides. In the sheet physical and chemical belt, the "slice" plays a controlling role in the highway slope damage. This section of the highway is a three-story Panshan highway with a width of about 4 meters and complex topography, which is over 2500 meters above sea level. It is easy to cause traffic disruption due to landslides. Therefore, the highway slope is selected as the research object, and the field geological survey, slope mapping, landslide statistics and so on are carried out. The investigation shows that there are two to three groups of slope in the investigation area. In the same section of slope, the occurrence of "slice" is roughly consistent and regular. At the same time, dense "lithology" is developed in the slope rock mass with high muddy content, the spacing of the "schist" plane is less than 5 cm, while in the slope rock mass with low muddy content, the "laminae" plane spacing is more than 5 cm. Sheet physicochemical analysis results in the failure of rock and soil structure, which results in a fragmentation structure or a granular structure, which greatly reduces the overall strength of the slope. The failure of slope with sheet physical and chemical characteristics often occurs from the position where the slope develops "slice", which accelerates the failure process of slope and becomes the main factor to control the strength of slope rock mass and the development of deformation and failure of slope. In the study area, the typical slope is selected to measure, the "slice" occurrence is projected, the dominant structural plane is analyzed, and the stress and strain analysis of the sheet rock slope is carried out by using the strength reduction method of Flac3D. The stress distribution and deformation characteristics of the slope rock mass and the possible site of failure are obtained. It is found that the occurrence of "gouge" has a great influence on the increment of shear strain. When the occurrence of "gouge" is consistent with the slope inclination, the angle of inclination affects the site of failure and the position of slope failure after excavation. Combined with the local stratigraphic lithology, climate and slope engineering geological conditions, the damage process of the slope in this area is summarized.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U416.14

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1 許振華;片理結(jié)構(gòu)巖體采場穩(wěn)定性研究[D];江西理工大學(xué);2007年

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