| With the rapid urbanization process,there is more and more construction of deep foundation pit engineering near the subway,position of it and subway engineering has also become more and more complex,its mutual effects can not be ignored.The research on influence of foundation pit excavation to adjoining subway structures is also increasing.Because of time-space effect of foundation pit excavation,and complex characteristics of rock and soil between foundation pit and subway,it is difficult to analyze this type of project.In order to ensure foundation pit engineering is going on safety,economically and smoothly,at present,the main method is analyzed by numerical simulation technology for excavation process,it is to optimize the design and construction of foundation pit engineering,and ensure the safety of adjoining subway structure.In numerical simulation,the calculation results depends mostly on rock and soil parameters,which is uncertain,therefore,sensitivity analysis of related rock and soil parameters is very necessary to find out the primary and secondary parameters,control the deviation of the calculation results,it can also provide the basis data for back analysis to optimize arrangement of rock and soil test and reduce workload.Based on the foundation pit engineering in Baiyun District of Guangzhou,it is using the finite difference program FLAC3 D to calculate the displacement changes of foundation pit excavation to interval tunnel structure of adjoining subway line 2,and analyze the safety of subway structure,the calculation results are useful for construction and monitoring suggestions;in addition to do single factor sensitivity analysis for elastic modulus,cohesion and internal friction angle,and it obtains sensitivity changing trend of the parameters and the internal friction angle is the most sensitive parameter,this research has certain directive significance to numerical simulation for influence of deep foundation pit excavation to adjoining subway structure. |
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