Abstract
In order to relieve the increasing ground traffic pressure in the process of urbanization in China, it is inevitable to build more metro lines. However, the stratum movement caused by tunneling affects the safety of adjacent underground structures and aboveground buildings. Therefore, how to evaluate and control the stratum movement is a prominent problem. In this paper, based on the engineering project of an interval tunnel between Shizishan Station and Chuanshi Station in Chengdu Metro Line 7, China, the action mechanism of stratum movement induced by shield tunneling is analyzed, and the effect factors are divided into two categories: ground loss factors and mechanical factors. Combining the advantages of Loganathan method and mirror source-sink method, a new solution of three-dimensional displacement induced by ground loss is proposed. Based on the elastic half-space Mindlin model, the displacement at any point induced by four mechanical effect factors is deduced. Finally, the total displacement is verified by field monitoring data and quantitative analyzed in various parts.
Highlights
With the acceleration of urbanization in China, the growth rate of urban land use is much lower than the urban population growth rate
Based on the Verruijt analytical formula [34,35], considering quantify ground loss with non-equivalent radial displacement, Loganathan [21] put forward a method for estimating stratum displacement caused by ground loss in undrained clays; the formula is as shown in Equation (2)
Equation (5) shows that the distribution of stratum displacement caused by shield construction along the Y axis satisfies the law of 12 × [1 + y/(x2 + y2 + z2 ) 2 ]
Summary
With the acceleration of urbanization in China, the growth rate of urban land use is much lower than the urban population growth rate. Sci. 2019, 9, 3028 been a concern for engineers [10,11,12] The important of this problem has prompted researchers to study many methods for predicting stratum ofdisplacement by shield tunneling. Factors affecting stratum displacement, the ground loss during excavation, and thecategory second concerns addressesthe theground mechanical effect the methods can factors be divided intoshield two categories. In terms of mechanical effect In factors, through analytical solution [20,21,22,23], simulation and model testing [27,28]. Mindlin’s solution one ofMindlin’s the well-known to calculate the solutions stress andtodisplacement of mechanical effectisfactors, solutionsolutions is one of the well-known calculate the caused by displacement a point load caused at an embedment depth elastic half-space.
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