四川巴中田家坝滑坡形成机制及治理措施研究
发布时间：2018-09-04 05:46
【摘要】：巴中位于四川盆地东北部,属于西南红层分布区,发育有典型的易滑地层一砂、泥岩互层地层,斜坡稳定性问题十分突出,雨季经常诱发滑坡地质灾害,给人类的生命财产安全带来了严重的损失。巴中市枣林镇田家坝滑坡就属于此类人类工程活动破坏、降雨诱发的红层滑坡。田家坝山体为砂泥岩顺倾的单面山,达(州)～万(州)高速公路开挖山体前缘坡脚形成25 m路堑边坡,在未及时支护加固情况下,2011年9月16日巴中地区发生百年一遇的特大暴雨,斜坡因受降雨影响,9月18日斜坡沿着砂泥岩分界面向临空方向发生滑移破坏,发生了大规模基岩滑坡,体积约180万m3,共造成20栋民房不同程度受损,导致在建高速公路被迫改线,并严重威胁当地居民的生产生活。本文以田家坝滑坡为研究对象,充分掌握了滑坡的地质条件,分析滑坡的成因机制和变形破坏模式,反演滑坡的运动过程,对现有滑坡的稳定性进行评价,为田家坝滑坡的治理提出合理可行的方案。论文主要结论如下：(1)通过现场调查、勘探、室内试验等手段,充分掌握滑坡所处的地质背景、滑坡变形破坏特征、边界特征及岩土体分布情况,并根据坡体变形强弱对滑坡进行分区。(2)在滑坡的地质条件基础上,采用地质历史成因分析的方法,进一步分析滑坡的形成条件、滑坡的成因机制及变形破坏模式,最后得出田家坝滑坡是因坡脚开挖和强降雨的共同作用而诱发的滑坡。(3)采用离散元UDEC数值分析软件对田家坝滑坡的变形破坏进行反演,再现滑坡的运动过程。模拟工况主要为坡脚开挖前天然和暴雨工况、坡脚开挖后天然和暴雨工况。(4)采用传递系数法对田家坝现有斜坡进行定量评价,计算工况主要为天然、暴雨、和地震三种条件,并计算出各自的推力。(5)以田家坝滑坡的剩余推力为依据,结合田家坝滑坡的地形特征,提出合理可行的治理措施：抗滑桩+挡土墙+截排水沟+裂缝夯填。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22
本文编号：2221189
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22
【引证文献】
相关期刊论文 前1条
1 张光辉;;昔阳县环城西外公环路边坡滑坡治理方案的探析[J];建设科技;2016年12期
，本文编号：2221189
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