| With the rapid development of the subway,the number of commercial residences around the subway will increase,and such foundation pits often have the characteristics of high risk,large impact,and high support costs.At present,the selection of the water-stop curtain adjacent to the subway has important research significance on the impact of the existing subway.In this paper,relying on the nearby Zhengzhou Metro Line 1 as the background,in view of the special geological and hydrological conditions of the foundation pit,the water-stop curtain type suitable for this project is selected,and the finite element simulation analysis is used to study the water-stopping in the dewatering of the foundation pit.The main research on the impact of curtain use on existing tunnels is as follows:(1)On the basis of summarizing and analyzing the advantages and disadvantages of the currently commonly used waterproof curtain types,according to the characteristics of the project(deep and large),the nature of the soil layer(the Yellow River floodplain),and the surrounding environment(the relationship between the proposed building and the existing subway,etc.),The foundation pit has been optimized with a water-proof curtain.(2)The three-dimensional interaction model of soil-envelope structure-support systemsubway station was established by using the finite element software MIDAS /GTS,In addition,the non-stop water curtain and the waterproof curtain to penetrate into the sand layer to a certain depth,the waterproof curtain Four working conditions of 2 m and 4 m into the clay layer were used to study the influence of formation pore water pressure,tunnel floor water pressure,surface settlement,deformation of the ground and the surrounding structure on the adjacent subways.(3)Based on the results of numerical simulations,we propose risk warning and protection measures for the operational safety of Metro Line 1 and provide some references for similar projects. |
