發(fā)布時(shí)間：2018-03-10 21:58

  本文選題：昭通地區(qū)　切入點(diǎn)：古生界泥質(zhì)巖　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：滑坡是較為嚴(yán)重的地質(zhì)災(zāi)害之一,它常常會造成交通中斷、河道堵塞淤積、掩蓋村鎮(zhèn),給國家和人民的生命財(cái)產(chǎn)安全帶來巨大損失。通過收集整理關(guān)于滑坡研究相關(guān)文獻(xiàn)資料,初步掌握滑帶土研究現(xiàn)狀及研究方法,明確了滑帶土工程特性研究中存在的不足,即對區(qū)域性特殊滑帶土的研究并沒有達(dá)到令人滿意的程度,無法滿足當(dāng)前和今后對某一特定區(qū)域地質(zhì)災(zāi)害防治工作的要求。故本文以昭通地區(qū)古生界泥質(zhì)巖(泥巖、頁巖、板巖、粘土巖)軟弱易滑巖土體構(gòu)成的滑坡為研究對象,通過資料收集、野外調(diào)查、室內(nèi)物理力學(xué)試驗(yàn)分析研究該類滑坡形成條件,為該區(qū)古生界泥質(zhì)巖滑坡防治提供一定的指導(dǎo)作用。本文主要取得如下研究成果:(1)按滑面位置、力學(xué)性質(zhì)、巖土體結(jié)構(gòu)、滑坡規(guī)模、節(jié)理裂隙產(chǎn)狀對該區(qū)古生界泥質(zhì)巖滑坡進(jìn)行分類,為探討滑坡形成條件打下基礎(chǔ)。統(tǒng)計(jì)得出,研究區(qū)古生界泥質(zhì)巖滑坡滑動(dòng)面以發(fā)育于全～強(qiáng)風(fēng)化分界面最多,占統(tǒng)計(jì)樣本總量的71.1%,泥質(zhì)巖滑坡以小型牽引式居多。人工切坡至古生界泥質(zhì)巖中風(fēng)化層斜坡發(fā)生滑動(dòng)的個(gè)數(shù)占該類斜坡的90%以上,而人工切坡至古生界泥質(zhì)巖強(qiáng)風(fēng)化層斜坡發(fā)生滑動(dòng)的概率相比之下較小,僅占53%。(2)對研究區(qū)古生界泥質(zhì)巖物理力學(xué)指標(biāo)統(tǒng)計(jì)分析得出,全風(fēng)化泥質(zhì)巖粘聚力、內(nèi)摩擦角較強(qiáng)風(fēng)化泥質(zhì)巖較小,而含水率、孔隙比較大,這也很好地解釋了滑坡滑面發(fā)育于強(qiáng)～中風(fēng)化層分界面多的原因;物理力學(xué)指標(biāo)相關(guān)性分析得出,泥質(zhì)巖內(nèi)摩擦角隨著含水率的降低,呈現(xiàn)較好的負(fù)相關(guān)關(guān)系。(3)對研究區(qū)典型古生界泥質(zhì)巖滑坡建立三維模型,并結(jié)合定性評價(jià)方法綜合評價(jià)其穩(wěn)定性,采用極限平衡法對三維數(shù)值模擬結(jié)果進(jìn)行驗(yàn)證,極限平衡法計(jì)算得出的穩(wěn)定系數(shù)小于FLAC3D計(jì)算得出的結(jié)果,偏于安全。(4)從地形地貌,地質(zhì)構(gòu)造、巖土體性質(zhì)及結(jié)構(gòu)、地表水和地下水作用、人工切坡四個(gè)方面探討研究區(qū)古生界泥質(zhì)巖滑坡形成條件,并對其進(jìn)行了防治。
[Abstract]:Landslide is one of the more serious geological disasters, it often causes traffic interruption, river channel blockage and siltation, cover up villages and towns, and bring huge losses to the life and property safety of the country and people. The present research situation and research methods of slip zone soil are preliminarily grasped, and the shortcomings of the study on the engineering characteristics of slip zone soil are clarified, that is, the research on regional special slip zone soil has not reached a satisfactory degree. It can not meet the requirements of the present and future geological hazard prevention work in a certain region. Therefore, the landslide composed of paleozoic mudstone (mudstone, shale, slate, clay rock) in the Paleozoic in Zhaotong area is taken as the research object. Through data collection, field investigation and laboratory physical and mechanical test, the forming conditions of this kind of landslide are analyzed and studied, which provides some guidance for the prevention and control of Paleozoic mudstone landslide. Mechanical properties, structure of rock and soil, scale of landslide, occurrence of joints and fissures are used to classify Paleozoic muddy rock landslide in this area, which lays a foundation for discussion of landslide forming conditions. The slip surface of Paleozoic mudstone landslide in the study area is the most developed at the interface of the whole to strong weathering. 71.1% of the total number of statistical samples, mudstone landslide is mostly of small traction type. The number of weathered layer slopes in artificial cut slope to Paleozoic mudstone is more than 90% of this kind of slope. However, the probability of sliding from artificial slope to Paleozoic mudstone strong weathering layer is relatively small, accounting for only 53% of the slope, and the statistical analysis of physical and mechanical indexes of Paleozoic mudstone in the study area shows that the cohesive force of fully weathered mudstone is obtained. The internal friction angle is stronger than the weathered mudstone, but the water content and porosity are relatively large, which also explains the reason that the landslide slide surface has more interface between strong and middle weathered layers, and the correlation analysis of physical and mechanical indexes shows that, With the decrease of water content, the internal friction angle of argillaceous rock presents a good negative correlation. (3) A 3D model of typical Paleozoic mudstone landslide in the study area is established, and its stability is evaluated synthetically with qualitative evaluation method. The limit equilibrium method is used to verify the results of 3D numerical simulation. The stability coefficient calculated by the limit equilibrium method is smaller than that obtained by FLAC3D. The forming conditions of paleozoic mudstone landslide in the study area are discussed in four aspects of surface water and groundwater action and artificial slope cutting, and the prevention and treatment are carried out.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P642.22

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