The Study On The Geological Environmental Guality Assessment Of Urban Underground Space Development

The exploitation and utilization experience of underground space home and abroad shows that in-depth studying in characteristics of urban regional geological environment and further research on urban underground engineering geology problems are the basis of exploitation and utilization of urban underground space scientifically. At present, the research data of geological environment quality estimating on the exploiting of urban underground space is exiguous. So, the research on the exploiting of urban underground space is essential in terms of quality of geological environment.Geological environment quality estimate on the exploiting of urban underground space is a very complicated systems engineering problem. The article dissected mutual constraint relations of geological environment and underground space exploiting in investigated area in depth. Taking geologic framework, landform and physiognomy, character of rock and soil, condition of water environment and geological process as the regulation, the article estimated geological environment quality of underground space exploiting in investigated area with method of AHP and divided the investigated area into four quality grades: perfect area, preferable area, ecumenical area and poor area. The estimated result shows that ilka acreage percentage of four quality grades is: 10%, 40%, 35% and 15%. On combining the actual situation of some underground engineering reconnaissance, the article also validated that the results of model evaluation fit in with the investigation of geological environment quality. At last, based on geological environment quality characteristics of underground space exploiting, the paper put forward some suggestions on urban underground space exploiting in investigated area.By above-mentioned research, the cognitions that the paper obtained are as follows:(1) Based on the principles of environmental engineering geology quality assessment, the paper analyzed the main factors of geological environment that restrict urban underground space exploiting. According to the theory of environmental engineering geology quality assessment, the work bring forward estimating ideology and index system of geological environment quality in exploiting urban underground space for the first time.(2) By building and researching three-dimensional stratal configuration model of underground geological carrier in the investigated area, the article evaluated the factors that restrict urban underground space exploiting.(3) The results indicate that: tridimensional compages of stratums have great effect on the exploiting of urban underground space in the investigated area; Active fault and earthquake have determinate fatalness; Perched water, groundwater and local artesian water affect the research on urban underground space exploiting. Corrosion action of groundwater and sand liquefaction in local region should also be brought to the forefront.(4) The research results indicate that the index system selected by the paper is rational which has some consulted significance to direct geological environment quality estimation of underground space exploiting in other big city.(5) The conclusion of geological environment quality in exploiting underground space is that the eastern is good while it become worse gradually towards southwest. According to this, the paper analyzed the extension of underground space exploiting in terms of engineering construction method and potential safety hazard of underground space exploiting. The paper also advised methods of construction and objects to prevent, which can be referenced by planning and construction of underground space exploiting in the investigated area.