北京市雁翅镇田庄村北不稳定斜坡防治工程设计

发布时间：2018-01-29 22:51

本文关键词： 田庄北京不稳定斜坡地质灾害工程设计　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：田庄地质灾害(不稳定斜坡)调查采用了多项工作手段,包括工程地质测绘、工程测量、槽探、物探、取样测试等,基本查明了田庄斜坡区的地形地貌条件、地层岩性特征、地质构造特征以及水文与工程地质条件等综合信息,提取了有关斜坡稳定性评价的多项岩土力学参数,为分析与评价工作区斜坡的稳定性提供了第一手资料。通过本次勘查,可得出如下结论:1、查明了田庄不稳定斜坡的基本地形特征。斜坡整体呈北西-南东方向展布,北以已修排水沟为界,南以房屋后挡墙为边,东西两侧以自然形成冲沟为界。地形走势北西侧高南东侧低,坡度约24.5o,最大高差达20m。斜坡纵向(NW-SE)长约50m,横向(NE-SW)长约278m。2、查明了斜坡变形的形成机制。工作区斜坡变形方式主要以第四系坡洪积层的蠕滑变形方式为主;工作区表层被人工填土覆盖,下部物质主要由呈互层关系的角砾混粘性土与粉质粘土组成,由于土层厚度较大,遇水情况下,其物理力学性质变差,存在坍塌变形的可能;除此自然因素之外,耕地开垦、房屋建设等人为活动因素时常导致高陡临空面的形成,这进一步为斜坡变形提供了外在便利条件;另外,田庄地处北京西部山区,降水也成为诱发斜坡失稳最重要外在因素之一。3、通过综合分析,田庄不稳定斜坡破坏模式主要以小规模坍塌为主,在持续暴雨条件下,有可能逐渐演化成坡面泥石流,对斜坡前缘30余户、100余人、近100间民房产生最直接、最严重的威胁。4、在综合调查的基础上,通过斜坡稳定性公式计算结果得知,田庄斜坡在天然状态和天然状态+地震工况条件两种状态下,常处于稳定状态;但在天然状态+暴雨状态工况条件会变得下极不稳定,这一计算结果与与实际情况相符。5、经过详细的综合工程调查和室内分析,本文建议对该斜坡采取挡土墙+排水工程+削坡工程+护坡工程相结合的综合治理方案,以最大限度降低地质灾害发生的可能性。
[Abstract]:Gangzhuang geological hazard (unstable slope) investigation adopted a number of working methods, including engineering geological mapping, engineering survey, trough exploration, geophysical exploration, sampling test, etc., basically found out the topographic and geomorphological conditions of Tianzhuang slope area. According to the comprehensive information of stratigraphic lithology, geological structure and hydrology and engineering geological conditions, a number of geotechnical and mechanical parameters related to the evaluation of slope stability are extracted. This paper provides first-hand information for the analysis and evaluation of the stability of the slope in the working area. Through this survey, we can draw the following conclusions: 1. The basic topographic features of the unstable slope in Gangzhuang are identified. The slope is spread in the north-west to the east, the drainage ditch is the boundary in the north, and the back wall of the house is taken as the edge in the south. The east and west sides are bounded by naturally formed gullies. The topographic trend is high and low in the north and west, with a slope of about 24.5o. the maximum height difference is 20m. The slope is about 50m long. The transverse NE-SW) is about 278m. 2, which shows the formation mechanism of slope deformation. The slope deformation mode in the working area is mainly the creep deformation mode of the Quaternary slope flood accumulation layer. The surface layer of the work area is covered by artificial fill and the lower material is mainly composed of breccia mixed clay and silty clay with interbedded relationship. Because of the thick soil layer its physical and mechanical properties become worse in the case of water. There is the possibility of collapse deformation; In addition to this natural factor, cultivated land reclamation, housing construction and other artificial activity factors often lead to the formation of high and steep face, which further provides external convenience for slope deformation; In addition, Tianzhuang is located in the western mountainous area of Beijing, precipitation has also become one of the most important external factors to induce slope instability. Through comprehensive analysis, the main failure mode of unstable slope in Tianzhuang is small scale collapse. Under the condition of continuous torrential rain, it is possible to gradually evolve into mud-rock flow on the slope, which will bring about the most direct and serious threat to more than 30 households and 100 houses on the front edge of the slope. On the basis of comprehensive investigation, through the calculation results of slope stability formula, it is known that the slope of Tianzhuang is usually in a stable state under two conditions of natural state and natural state of earthquake. However, in the natural state of rainstorm working conditions will become extremely unstable, this calculation results are in accordance with the actual situation. 5, after detailed comprehensive engineering investigation and indoor analysis. In this paper, it is suggested that the slope protection project should be integrated with the slope protection project of the retaining wall drainage project in order to minimize the possibility of geological disasters.
【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】：2017
【分类号】：P642.2;TU753.8

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