【摘要】：巴中位于四川盆地東北部,屬于西南紅層分布區(qū),發(fā)育有典型的易滑地層一砂、泥巖互層地層,斜坡穩(wěn)定性問題十分突出,雨季經(jīng)常誘發(fā)滑坡地質(zhì)災(zāi)害,給人類的生命財產(chǎn)安全帶來了嚴(yán)重的損失。巴中市棗林鎮(zhèn)田家壩滑坡就屬于此類人類工程活動破壞、降雨誘發(fā)的紅層滑坡。田家壩山體為砂泥巖順傾的單面山,達(dá)(州)～萬(州)高速公路開挖山體前緣坡腳形成25 m路塹邊坡,在未及時支護(hù)加固情況下,2011年9月16日巴中地區(qū)發(fā)生百年一遇的特大暴雨,斜坡因受降雨影響,9月18日斜坡沿著砂泥巖分界面向臨空方向發(fā)生滑移破壞,發(fā)生了大規(guī)�；鶐r滑坡,體積約180萬m3,共造成20棟民房不同程度受損,導(dǎo)致在建高速公路被迫改線,并嚴(yán)重威脅當(dāng)?shù)鼐用竦纳a(chǎn)生活。本文以田家壩滑坡為研究對象,充分掌握了滑坡的地質(zhì)條件,分析滑坡的成因機(jī)制和變形破壞模式,反演滑坡的運動過程,對現(xiàn)有滑坡的穩(wěn)定性進(jìn)行評價,為田家壩滑坡的治理提出合理可行的方案。論文主要結(jié)論如下：(1)通過現(xiàn)場調(diào)查、勘探、室內(nèi)試驗等手段,充分掌握滑坡所處的地質(zhì)背景、滑坡變形破壞特征、邊界特征及巖土體分布情況,并根據(jù)坡體變形強(qiáng)弱對滑坡進(jìn)行分區(qū)。(2)在滑坡的地質(zhì)條件基礎(chǔ)上,采用地質(zhì)歷史成因分析的方法,進(jìn)一步分析滑坡的形成條件、滑坡的成因機(jī)制及變形破壞模式,最后得出田家壩滑坡是因坡腳開挖和強(qiáng)降雨的共同作用而誘發(fā)的滑坡。(3)采用離散元UDEC數(shù)值分析軟件對田家壩滑坡的變形破壞進(jìn)行反演,再現(xiàn)滑坡的運動過程。模擬工況主要為坡腳開挖前天然和暴雨工況、坡腳開挖后天然和暴雨工況。(4)采用傳遞系數(shù)法對田家壩現(xiàn)有斜坡進(jìn)行定量評價,計算工況主要為天然、暴雨、和地震三種條件,并計算出各自的推力。(5)以田家壩滑坡的剩余推力為依據(jù),結(jié)合田家壩滑坡的地形特征,提出合理可行的治理措施：抗滑樁+擋土墻+截排水溝+裂縫夯填。
[Abstract]:Bazhong is located in the northeast of Sichuan Basin, which belongs to the southwest red bed distribution area. There are typical slippery strata, sand and mudstone interbedded strata, the slope stability is very prominent, and landslide geological disasters are often induced in the rainy season. The safety of human life and property has brought serious losses. Tianjiaba landslide in Zaolin Town, Bazhong City, belongs to this kind of red bed landslide induced by rainfall. The Tianjiaba mountain body is a single-sided hill with sand and mudstone declination. A 25m cutting slope is formed at the foot of the front slope of the Dazhou ~ Wanzhou Expressway. On September 16, 2011, a severe rainstorm occurred in Bazhong on September 16, 2011 without timely support and reinforcement. The slope was affected by rainfall, and on September 18, the slope slid along the direction of sand and mudstone boundary facing to the sky. A large scale bedrock landslide occurred, with a volume of about 1.8 million m3, resulting in 20 houses being damaged in varying degrees, resulting in the forced realignment of the highway under construction and a serious threat to the production and life of local residents. This paper takes Tianjiaba landslide as the research object, fully grasps the geological conditions of the landslide, analyzes the formation mechanism and the deformation and failure mode of the landslide, retrieves the movement process of the landslide, and evaluates the stability of the existing landslide. A reasonable and feasible scheme is put forward for the treatment of Tianjiaba landslide. The main conclusions are as follows: (1) by means of field investigation, exploration and laboratory test, the geological background, deformation and failure characteristics, boundary characteristics and distribution of rock and soil mass of landslide are fully understood. According to the degree of slope deformation, landslide is partitioned. (2) on the basis of the geological conditions of landslide, the formation condition, mechanism and deformation failure mode of landslide are further analyzed by the method of geological historical cause analysis. Finally, it is concluded that the Tianjiaba landslide is induced by the joint action of slope foot excavation and heavy rainfall. (3) the deformation and failure of Tianjiaba landslide are inversed by using discrete element UDEC numerical analysis software, and the motion process of the landslide is reproduced. The simulation conditions are mainly natural and rainstorm before slope excavation, natural and rainstorm after slope excavation. (4) quantitative evaluation of the existing slope of Tianjia Dam is carried out by using transfer coefficient method. The calculation conditions are mainly natural, rainstorm and earthquake. Based on the residual thrust of Tianjiaba landslide and the topographic characteristics of Tianjiaba landslide, the reasonable and feasible treatment measures are put forward, which are as follows: Anti-slide pile retaining wall cut off drainage ditch crack tamping fill.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P642.22

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 張光輝;;昔陽縣環(huán)城西外公環(huán)路邊坡滑坡治理方案的探析[J];建設(shè)科技;2016年12期

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本文編號：2221189