【摘要】：滑坡與地震、洪水并列為世界范圍內(nèi)的三大自然災害之一,滑坡會導致交通中斷、河道堵塞,鄉(xiāng)村城鎮(zhèn)被掩埋,對人類生命財產(chǎn)構(gòu)成巨大危害。我國是一個多山的國家,尤其是我國西部地區(qū)和東南沿海的福建、廣西、廣東、海南等地。據(jù)統(tǒng)計全國約有67%的面積屬于山地,滑坡發(fā)生的頻率和數(shù)量在世界范圍內(nèi)都屬于較多的。樂山滑坡屬于大型滑坡,研究樂山滑坡加固具有重大的社會效益和工程意義。主要研究了四方面的內(nèi)容:1)定性分析樂山滑坡產(chǎn)生機理。通過實地勘探、鉆孔取樣等方式,查明了樂山滑坡水文地質(zhì)工程地質(zhì)條件,滑坡體主要裂縫分布及其特征。結(jié)論為:地質(zhì)條件是樂山滑坡產(chǎn)生的主要原因,滑坡前緣鄉(xiāng)村公路修建時形成的高約3~5m的邊坡等因素是次因。2)采用傳遞系數(shù)法分析坡體無加固時在天然狀況、暴雨和地震作用等三種工況下的穩(wěn)定系數(shù),并進行穩(wěn)定系數(shù)受重度γ、C、φ三個參數(shù)影響的敏感性分析。在天然狀態(tài)下及地震工況下,該滑坡整體是穩(wěn)定的,在暴雨飽和狀態(tài)工況下,滑坡整體處于欠穩(wěn)定~基本穩(wěn)定狀態(tài)。3)基于層次分析法,考慮技術(shù)、經(jīng)濟、安全和環(huán)境因素,建立了滑坡加固方案評價體系。并通過專家打分對樂山滑坡抗滑樁加固與錨索加固兩種方案進行了比選。4)基于有限差分數(shù)值分析法,采用巖土大型軟件FLAC3D對抗滑樁加固樂山滑坡進行數(shù)值模擬,系統(tǒng)地研究抗滑樁橫截面尺寸、樁間距、樁的設置位置這三個關(guān)鍵參數(shù)對滑坡體滑移特征、坡體塑性區(qū)分布、坡體剪切應變增量、坡體節(jié)點位移以及樁身位移、樁身彎矩、樁身剪力的影響。得出主要結(jié)論如下:(1)樁間距主要影響抗滑樁加固圈大小,對樁身受力變形也有部分影響;(2)抗滑樁設置位置主要影響滑坡體的滑移最大值和坡頂處塑性區(qū)面積,對樁身受力變形影響較小;(3)樁尺寸主要影響樁身受力變形及加固圈的變形,由于計算不考慮抗滑樁的破壞,樁尺寸對滑坡體影響較小。樁尺寸越大,樁身受力越大、變形越小,加固圈變形也越小。
[Abstract]:Landslides, earthquakes and floods are listed as one of the three natural disasters in the world. Landslides can lead to traffic disruption, River blockage, burial of rural towns and villages, and cause great harm to human life and property. China is a mountainous country, especially in the western region of China and the southeastern coastal areas of Fujian, Guangxi, Guangdong, Hainan and other places. About 67% of the country belongs to mountainous areas, and the frequency and quantity of landslides are more in the world. Leshan landslide belongs to large-scale landslides. It is of great social benefit and engineering significance to study the reinforcement of Leshan landslide. By sampling and other methods, the hydrogeological engineering geological conditions of Leshan landslide, the distribution and characteristics of main cracks in the landslide body were found out. The stability coefficients of the landslide under natural conditions, rainstorm and earthquake are analyzed and the sensitivity of the stability coefficients affected by the three parameters of gravity y y, C and phi is analyzed. Based on the analysis method, considering the technical, economic, safety and environmental factors, the evaluation system of the landslide reinforcement scheme is established. The two schemes of the anti-slide pile reinforcement and the anchor cable reinforcement of Leshan landslide are compared and selected through the expert scoring. 4) Based on the finite difference numerical analysis method, the numerical model of the anti-slide pile reinforcement of Leshan landslide is established by using the large-scale geotechnical software FLAC3D. In this paper, the influence of the three key parameters of anti-slide piles, i.e. cross-section size, pile spacing and pile setting position, on the sliding characteristics of landslide, the distribution of slope plastic zone, the increment of slope shear strain, the displacement of slope nodes, the displacement of pile body, the bending moment of pile body and the shear force of pile body are studied systematically. The size of the retaining ring also has some influence on the deformation of the pile body; (2) The location of the anti-slide pile mainly affects the maximum slip of the landslide body and the area of the plastic zone at the top of the slope, but has little effect on the deformation of the pile body; (3) The pile size mainly affects the deformation of the pile body and the deformation of the reinforcement ring, because the calculation does not take into account the failure of the anti-slide pile, the pile size on the slide. The larger the pile size is, the greater the stress and the smaller the deformation of the pile, the smaller the deformation of the reinforcing ring.
【學位授予單位】：東華理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P642.22;TU753.8

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本文編號：2243106