重庆沙坪坝区金沙正街塌岸预测评价

发布时间：2018-02-20 22:38

本文关键词： 三峡水库库区塌岸侵蚀型滑移型刚体极限平衡法　出处：《中国地质大学（北京）》2014年硕士论文　论文类型：学位论文

【摘要】：三峡水库蓄水使得库区水位处于较大幅度动态变化之中，从而引发了一系列的库区地质环境问题，其中塌岸是影响三峡工程安全的重大地质灾害问题之一。重庆沙坪坝段金沙正街塌岸位于三峡库区库尾的重庆段，本文通过野外勘查及室内分析，采用两端法、卡丘金法、佐罗塔廖夫法及岸坡结构法等多种方法对研究区侵蚀型塌岸可能性进行预测；采用刚体极限平衡法对滑移型塌岸可能性进行了分析。通过深入分析研究，取得了以下主要成果：（1）在现场实地勘查的的基础上，查明了该塌岸的工程地质环境条件，主要包括有岸坡形态特征、岸坡结构特征、物质组成、水文地质条件，现状条件下塌岸的发育和分布特点，为该塌岸的预测提供了较为完善的地质基础。（2）采用两端法、卡丘金法、佐罗塔廖夫法及岸坡结构法对该塌岸的发育规模进行了预测，并对比分析各方法预测结果得到岸坡结构法和佐罗塔廖夫法预测结果相近，而两端法相对于岸坡结构法和佐罗塔廖夫法预测结果偏大，原因可能是两端法考虑了毛细水上升高度的因素。而当岸坡物质单一、变化不大时，卡丘金法预测结果是与其他三种预测方法接近的，，当遇到岸坡物质结构复杂时，卡丘金法预测结果偏大。（3）通过极限平衡法计算了该塌岸的稳定性，得出在最不利工况条件下研究区岸坡也是出于稳定状态的，从而排除了研究区岸坡存在滑移性的可能，可以确定研究区岸坡塌岸类型为侵蚀型塌岸。
[Abstract]:The storage of water in the three Gorges Reservoir makes the water level in the reservoir area in a relatively large dynamic change, thus causing a series of geological environmental problems in the reservoir area. The bank collapse is one of the major geological hazards affecting the safety of the three Gorges Project. The Jinsha main Street in Shapingba section of Chongqing is located at the end of the reservoir in the three Gorges Reservoir area. Through field exploration and indoor analysis, this paper adopts the two-end method and the Kachujin method. Several methods, such as Zorotaliov method and bank slope structure method, are used to predict the possibility of erosion type bank collapse in the study area, and rigid body limit equilibrium method is used to analyze the possibility of slip type bank collapse. Through in-depth analysis and study, the following main results have been obtained:. (1) on the basis of on-the-spot investigation, the engineering geological environmental conditions of the bank collapse are found out, which mainly include the characteristics of bank slope morphology, slope structure, material composition, hydrogeological conditions, and the development and distribution of the bank collapse under the present condition. It provides a relatively perfect geological basis for the prediction of the bank collapse. (2) the development scale of the bank collapse is predicted by using the two ends method, the Kachujin method, the Zorotaliov method and the slope structure method. The results of comparison and analysis show that the prediction results of the slope structure method and the Zorotaliov method are similar. Compared with the slope structure method and the Zorotaliov method, the two ends method may be due to the fact that the two ends method takes into account the rising height of capillary water, but when the slope material is single, the change is not obvious. The results of Kachujin method are close to those of other three methods. When the material structure of bank slope is complex, the result of Kachujin method is larger than that of other methods. 3) the stability of the bank collapse is calculated by using the limit equilibrium method, and it is concluded that the slope of the study area is also stable under the most unfavorable working conditions, thus eliminating the possibility of the slip of the bank slope in the study area. It can be determined that the type of bank collapse in the study area is erosion type.
【学位授予单位】：中国地质大学（北京）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV221.2

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