云南玉溪—普洱红层区泥岩滑坡的形成机制及防治对策研究

发布时间：2018-07-31 05:00

【摘要】：在经济飞速发展的当下时节,几乎各个角落都出现了人类为了自我的生存利益而改造自然界的现象。在这个持续了几千年的改造过程中,大量边坡随着时代出现在人类的生活中,并愈演愈烈,随之边坡的稳定与否便成为了一个不可逃避的问题,它的安全也时刻决定着人类的安全与否,而滑坡灾害也成为了最为频繁的地质灾害之一,其中红层的滑坡问题也尤为值得关注。红层区在云南分布广泛,而玉溪--普洱红层区分布比例较大,其岩性以泥岩为最主要的,故本文以玉溪--普洱红层区泥岩滑坡作为研究对象。在系统的野外勘察与详细的资料统计与研读的基础上,根据不同的分类方式对研究区内的泥岩滑坡作出统计,之后对典型的滑坡作出定性分析与定量评价,其中用到ansys、 FLAC-3D与理正软件,并取得了可靠结论,为滑坡的防治提供理论依据。研究结果表明研究区内开挖至全风化层发生滑坡的几率较开挖至强风化层发生滑坡要低,而所有滑坡中滑面位于强-中风化分界线的滑坡最多,滑面位于全-强风化分界线的滑坡较少,二者比例分别为82.58%和15.91%。通过分析可知由于全风化泥岩岩层性质接近土质,松散的结构与较大的缝隙导致了大量的降水水体下渗至强风化岩层,而强风化泥岩与中风化你岩层的性质差异较大,中风化泥岩岩层的缝隙很小,水体不能自由下渗,故其主要赋存于强风化泥岩岩层下部,导致滑面最容易发生于强-中风化分界线,同时致使因开挖至强风化岩层而引发滑坡的几率更高。通过评价结果可知在天然状态下,区内滑坡多为稳定或欠稳定状态,而在暴雨或地震的因素之下,稳定性大大降低,故应对滑坡加强防护,并根据各自特点采取不同的支挡加固、护坡排水等措施。
[Abstract]:In the current period of rapid economic development, almost every corner of the phenomenon of human beings to transform the natural world for their own survival. In the course of this transformation, which lasted for thousands of years, a large number of slopes appeared in human life with the times, and became more and more serious, and the stability of the slopes became an unavoidable problem. Its safety also determines the safety of human beings at all times, and landslide disaster has become one of the most frequent geological disasters, among which the problem of red bed landslide is especially worthy of attention. The red bed area is widely distributed in Yunnan, while the Yuxi-Pu 'er red bed area has a large proportion of distribution, and its lithology is dominated by mudstone. Therefore, this paper takes the mudstone landslide in Yuxi-Pu 'er red bed area as the research object. On the basis of systematic field survey and detailed data statistics and study, according to different classification methods, the mudstone landslide in the study area is counted, and then the qualitative analysis and quantitative evaluation of typical landslide are made. ANSYS, FLAC-3D and Lizheng software are used, and reliable conclusions are obtained, which provide theoretical basis for landslide prevention. The results show that the probability of landslides occurring in the study area from excavation to total weathering is lower than that from excavation to strong weathering, and the landslide with sliding surface located on the boundary line between strong and middle weathering is the most common in all landslides. There are few landslides located on the boundary of total weathering and strong weathering, the ratio of them is 82.58% and 15.91% respectively. Through analysis, it can be seen that because the property of fully weathered mudstone is close to that of soil, the loose structure and large gap cause a large amount of precipitation water body to infiltrate into strongly weathered rock stratum, but the property of strongly weathered mudstone is different from that of middle weathered rock. Because the gap of middle weathered mudstone is very small and the water can't infiltrate freely, it mainly occurs in the lower part of strongly weathered mudstone, which leads to the slip surface occurring most easily on the boundary line between strong and middle weathering. It also increases the risk of landslides caused by excavation of highly weathered rock formations. The evaluation results show that in the natural state, the landslide in the region is mostly stable or unstable, but under the factors of heavy rain or earthquake, the stability is greatly reduced, so it is necessary to strengthen the protection against the landslide. According to their characteristics, different measures are taken, such as retaining reinforcement, slope protection and drainage.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

【参考文献】