The Silty Sand Stratum In Shallow Tunnel Station Construction Key Technology Research

In recent years, with the rapid development of economy and the process of urbanization, more and more people are moving into cities. On the one hand, they contribute their own strength to the construction of the city. On the other hand, with the increase of a large population, a variety of problems, especially the original ground traffic congestion has become unbearable. So people began to look at the underground traffic, the city began a large-scale construction of the underground railway. Due to the various cities of geology and traffic situation different, these underground railway construction, will inevitably be the encounter different geological environment and traffic conditions, different construction methods are taken according to the different urban environment. However, no matter what kind of environment, in the construction of the subway station, when the excavation will cause disturbance to the ground surface, and the deformation of surrounding buildings.Therefore, proper construction methods and protective reinforcement measures should be taken to reduce the incidence rate of accidents, ensure the daily life of the country and the people and the economy. So it is an urgent need to study the influence of the construction of the underground excavation station on the top of the soft ground and the surrounding buildings.This paper, taking Shijiazhuang city subway line one peace street station underground construction project as the background, through numerical simulation,find out the reasonable construction scheme of silty sand layer of the subway station,and analysis of underground construction in the process of the impact on the station above the line. The dissertation mainly includes the following several parts:(1)Will be the scene of the undisturbed soil sample experiments analysis, it is concluded that some physical parameters and mechanical properties of the silty sand,according to the physical indicators of silty sand and reasonable grouting method, and grouting to formation of sample analysis, and of the physical and mechanical properties of solid.(2) Advanced comprehensive analysis of a variety of supporting measures and construction method of their respective advantages and disadvantages and applicable condition, Combined with the engineering geological conditions and environmental factors, by FLAC3 Dfinite difference software simulation three construction methods,conclusion Zhu Dong method should be adopted to the construction of the mined metro station(3) In this article, through FLAC3 Dfinite difference software construction process simulation station, optimize the zhuzong method advanced support scheme,consider four advanced support scheme, Advanced small pipe support scheme, deep hole grouting scheme, pipe roof support scheme, deep hole grouting pipe roof support scheme. Through the numerical simulation analysis, Conclusion zhudong method, the optimal supporting scheme for deep hole grouting in advance plus pipe roof support scheme.(4) To organize the field measured data analysis, and compared with the results of numerical simulation, and with the results of numerical simulation to compare,conclusion zhudong some regularity in the process of construction.