Motel Test Research On Mechanical Characteristics Of Subway Station Construction In Finite Space Adjoining Structure

Subway along the line,especially near the subway station is often built a large high-rise buildings,the impact of finite space within the deep foundation pit construction on the existing structures can not be ignored.It is of great theoretical and practical significance to engineering technological progress and disaster prevention and control to carry out the theoretical and experimental research on the interaction of structures in small space.Based on the construction of the foundation pit of the Chegongmiao subway station in Shenzhen,this paper uses the theoretical analysis and the indoor model test to carry out a comprehensive study on the construction of the new and existing structures of the finite space.The main research contents of this study include:(1)Through the data mining summary,the general formula of finite soil pressure is deduced.O n the basis of predecessors' research,this paper makes a comparative study on the theoretical formulas of finite earth pressure and compares it with the experimental results.(2)Configured similar materials with good stability and easy control of performance in a finite rock and soil geomechanics model test.A new type of similar material was developed by comparing the characteristics of the test material with a large number of matching test,using the orthogonal test method and the whole factor test method.This material with iron powder,barite powder,quartz sand as aggregate,rosin,paraffin oil as a cement,gypsum as a regulator mixed.Some factors influencing the mechanical parameters of similar materials are summarized by the ratio test and data analysis.The new material has the characteristics of high capacity,low strength and low modulus,stable performance,easy processing and piling,and can be reused.It can simulate a wide range of rock mass material,which is an ideal geomechanical model similar material.(3)Carried out the Motel Test Research on Mechanical Characteristics of Subway Station Construction in Finite Space.The model test bench was designed,which can be assembled visualization and High strength.The test using the more advanced mechanical,resistive and fiber-based and other test technology to carry out multiple information monitoring.Through the production,excavation and data monitoring of the model under the condition of multiple working conditions,the earth pressure change of the finite space caused by the excavation of the foundation pit and the horizontal displacement law of the deep soil are obtained.