鹤大高速07标5#排土场滑动稳定性与泥石流危险性评价

发布时间：2018-01-05 09:56

本文关键词：鹤大高速07标5#排土场滑动稳定性与泥石流危险性评价　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：伴随着经济的高速发展,我国不断加大公路建设力度,但在公路尤其是山区公路设施建设过程中会产生大量的弃土弃渣。排土场作为公路建设过程中常见的线外工程,极易受降水及动荷载的影响丧失稳定性产生滑坡。在条件成熟时甚至具有发生泥石流的风险。鹤大高速公路07标5#排土场位于松江河村南临的沟谷内,排土场下方紧邻松花江村及G201国道。排土场内共排土21万m3,占地5.867公顷,弃土堆内夹杂有大量的松散土石块,排土场两侧山坡较陡,沟谷汇水条件好。本文对该排土场滑动稳定性进行了分析并且对泥石流成灾风险性进行了评价并提出相应的防治对策,具体结论如下:1.排土场内排土体三种可能滑动模式中,沿原始坡面滑动时的最小稳定性系数为2.207(Janbu法)和1.908(不平衡推力法);内部产生局部滑动时的最小稳定性系数为1.518(Janbu法)和1.262(不平衡推力法);排土不会造成基岩内部滑动。因此排土体稳定性较好,不会发生滑动。2.排土场形成泥石流危险性采用一级模糊评判时排土前危险度为0.507,属无危险,不会发生泥石流;排土后泥石流危险度为0.764,属轻度危险。采用二级模糊评判该排土场排土后泥石流危险度为0.729,属轻度危险。3.建议采用岩土工程和生物工程相结合的措施对排土场泥石流进行防治,同时应加强人民群众的宣传教育工作,必要时可以转移安置直接对着沟头并处沟底的居民,从而保证当地居民的生产生活以及财产安全。
[Abstract]:With the rapid development of economy, our country has been increasing the intensity of highway construction. However, in the process of highway construction, especially in mountain area, a large number of abandoned soil and slag will be produced. Dump is a common off-line project in the process of highway construction. Easily affected by precipitation and dynamic load loss of stability, landslide, even in mature conditions with the risk of debris flow. He-Da Expressway No. 07 dumping site is located in the valley south of Songjiang River Village. The dump is adjacent to Songhuajiang village and G201 national highway. 210,000 m3 of soil is discharged from the dump, covering an area of 5. 867-hectare. There are a large number of loose soil rocks in the dump, and the slopes on both sides of the dump are steep. In this paper, the sliding stability of the dump is analyzed, and the risk of debris flow is evaluated and the corresponding countermeasures are put forward. The concrete conclusion is as follows: 1. In the three possible sliding modes of soil drainage in the dump. The minimum stability coefficients for sliding along the original slope are 2.207 ~ 1. 908 (unbalance thrust method) and 1.908 (unbalance thrust method); The minimum stability coefficients are 1.518% Janbu method and 1.262 (unbalanced thrust method) when local sliding occurs. Dumping soil will not cause the internal sliding of bedrock, so the stability of the drainage soil is better, and no slippage .2. the risk of debris flow formation in the dump is 0.507 when the first-grade fuzzy evaluation is adopted. Is not dangerous, will not occur debris flow; The risk degree of debris flow after dumping is 0.764, which is a mild hazard. The risk of debris flow after dumping is 0.729 by using second-level fuzzy evaluation. It is suggested that the combined measures of geotechnical engineering and biological engineering should be adopted to prevent debris flow in the dump, and the propaganda and education work of the people should be strengthened at the same time. If necessary, the residents can be transferred directly to the bottom of the trench, so as to ensure the production, life and property safety of the local residents.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U418.56;P642.2

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