田市镇及周边地区工程地质环境质量评价与工程建设适宜性分析

发布时间：2017-12-31 03:35

本文关键词：田市镇及周边地区工程地质环境质量评价与工程建设适宜性分析　出处：《长安大学》2016年硕士论文　论文类型：学位论文

【摘要】：伴随城市工程经济建设的快速发展,各类城市地质环境问题日益突出。因此,开展城市工程地质环境质量评价,不仅对各类工程建设适宜性规划及建设具有重要的指导意义,同时还能有效地实现地质环境条件的充分利用与保护,实现人类工程建设与自然环境之间的相互协调。本文以1:5万田市镇图幅区为研究对象,在野外调查的基础上,对该区的工程地质环境质量进行了分析评价与工程建设适宜性的分析与分区。主要取得以下认识和成果:1、研究区地处关中盆地东端中北部,属于温暖带大陆性气候。区内地形平坦,地质结构简单;全区可划分为北山山前一级冲洪积扇、塬前现代洪积扇、渭河一级阶地及高、低漫滩五种微地貌单元;研究区地表仅有第四系地层出露;岩土体工程地质结构类型主要为双层(3种)和多层(10种)结构;区内分布4条断裂,分别为临潼—长安断裂、礼泉—高陵—固市断裂、渭南塬前断裂和贾新庄—蔡郭村断裂。其中渭南塬前断裂和贾新庄—蔡郭村断裂为全新世活动断裂,长安—临潼断裂和礼泉—高陵—固市断裂为晚更新世活动断裂;区内新构造运动强烈,主要表现为大幅度的整体间歇性、差异性沉降运动;研究区所在的关中盆地东部地震烈度为8度区,其余为7度区;区内地下水资源较丰富,地下水分为第四系冲积、冲洪积层孔隙潜水和第四纪冲积、冲洪积层孔隙承压水两大类型;区内径流排泄条件良好。2、影响研究区工程地质环境质量的主要影响因素包括地形地貌、地层岩性、不良地质作用、地下水条件、地震基本烈度、地质构造和岩土体性质等。3、研究区内地质灾害发育极少,存在的潜在工程地质问题主要是砂土液化、黄土状土湿陷性和土壤盐渍化,但危害程度及范围相对较小。4、运用层次分析法开展了区内工程地质环境质量评价,评价内容包括地基稳定性、地壳稳定性和场地稳定性。全区地壳稳定性为基本稳定区;地基稳定性和场地稳定性可划分为稳定区、较稳定区和稳定性较差区,地基稳定区面积约88.23km2,占研究区总面积的21.3㳠;地基较稳定区面积约291.68 km2,占研究区总面积的69.4㳠;地基稳定性较差区面积约40.09 km2,占研究区总面积的9.5㳠;区内场地稳定区面积约178.39km2,占研究区总面积的42.5㳠;场地较稳定区主总面积约92.34 km2,占全区总面积的22.0㳠;场地稳定性较差区总面积149.37 km2,占研究区总面积的35.5㳠。5、工程建设适宜性的分析结果表明,区内场地工程地质环境建设适宜性总体较好,适宜和较适宜工程建设活动的区域占74.5㳠,适宜性较差区仅占25.5㳠,且主要集中分布于断裂周围500m范围内和渭河及其支流的河谷、漫滩区。该区域虽然不适合作为较为强烈的或者重要工程建设场地,但适宜用于规划人员较稀少的用地类型,比如绿化及生态开发等。
[Abstract]:With the rapid development of urban engineering economic construction, various kinds of urban geological environment problems become increasingly prominent. Therefore, the quality evaluation of urban engineering geological environment is carried out. It not only has important guiding significance for various kinds of engineering construction suitability planning and construction, but also can effectively realize the full utilization and protection of geological environmental conditions. To realize the mutual coordination between human engineering construction and natural environment. This paper takes the map area of 1: 50 000 towns as the research object, on the basis of field investigation. The quality of engineering geological environment in this area is analyzed and evaluated and the suitability of engineering construction is analyzed and zoned. The main results are as follows: 1. The research area is located in the central and northern east end of Guanzhong basin. It belongs to the continental climate of warm zone. The terrain is flat and the geological structure is simple. The whole area can be divided into five kinds of microgeomorphological units: the first grade alluvial fan in the front of Beishan mountain, the modern alluvial fan in front of the plateau, the first terrace of Weihe River and the high and low floodplain. The surface of the study area is only exposed from Quaternary strata. The main types of engineering geological structure of rock and soil are three types of double layer and 10 kinds of multi-layer. There are 4 faults in the area, which are Lintong-Changan fault, Liquan-Gaoling-Gushi fault. The Qianjian fault and Jiaxinzhuang-Cai Guocun fault in Weinan Plateau, among which the Qianjian fault and Jiaxinzhuang-Cai Guocun fault in Weinan Plateau are Holocene active faults. Changan-Lintong fault and Liquan-Gaoling Gaoshi fault are active faults of late Pleistocene. The neotectonic movement in this area is strong, which is characterized by large scale intermission and differential subsidence. The seismic intensity in the eastern part of Guanzhong basin is 8 degrees, while the rest is 7 degrees. Groundwater resources are abundant in this area. Groundwater is divided into two types: Quaternary alluvium, phreatic phreatic water in alluvial layer and alluvial water in Quaternary, and pore confined water in alluvial layer. The runoff discharge condition in this area is good. 2. The main factors affecting the quality of engineering geological environment in the study area include topography and geomorphology, stratigraphic lithology, bad geological action, groundwater condition and basic earthquake intensity. Geological structure and geotechnical properties, etc., the geological disasters in the study area are rare, the potential engineering geological problems are mainly sand liquefaction, loess soil collapsibility and soil salinization. However, the degree and scope of damage is relatively small. 4. The evaluation of engineering geological environment quality in the area is carried out by AHP, which includes the stability of foundation. Crustal stability and site stability. The stability of foundation and site can be divided into stable areas, which are relatively stable and less stable. The area of foundation stability is about 88.23 km ~ 2, accounting for 21.3km ~ 2 of the total area of study area. The area of the more stable ground area is about 291.68 km ~ 2, accounting for 69.4% of the total area of the study area? The area of poor stability of the foundation is about 40.09 km ~ 2, accounting for 9.5% of the total area of the study area. The area of the site stability zone is about 178.39 km2, accounting for 42.5% of the total area of the study area? The total area of the more stable area is about 92.34 km ~ 2, accounting for 22.0? The total area of the site with poor stability is 149.37 km ~ 2, accounting for 35.5km ~ (2) of the total area of the study area. The analysis of the suitability of engineering construction shows that the suitability of site engineering geological environment in this area is good in general, and the suitable and more suitable area for engineering construction activities is 74.5? The area with poor suitability is only 25. 5? And it is mainly distributed in the area of 500m around the fault and the valley and floodplain area of the Weihe River and its tributaries. Although this area is not suitable for more intense or important engineering construction site. However, it is suitable for the types of land used by planners, such as greening and ecological development.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P642.4

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