Calculation method for soil deformation caused by double-circle shield tunnel construction deflection

Abstract

The invention relates to a calculation method for soil deformation caused by double-circle shield tunnel construction deflection. The calculation method includes the following steps of firstly, drawing a two-dimensional sectional drawing of double-circle shield tunnel excavation; secondly, determining the convergence radius of a tunnel; thirdly, drawing the shape, size and position of runnel convergence; fourthly, establishing a whole rectangular coordinate system; fifthly, establishing a local polar coordinate system; sixthly, establishing a function relation of soil deformation caused by unit soil loss; seventhly, dividing a soil loss distribution region into algebraic sums of four sub-regions; eighthly, calculating the total soil deformation component; ninthly, determining the soil deformation and direction according to the soil deformation component. The method is convenient to operate, vertical and transverse deformation, caused by double-circle shield tunnel construction, of any position of the ground surface and underground soil can be accurately obtained through simple design parameters and program calculation, and therefore the soil deformation field of the whole cross section can be simulated. By means of the method, soil deformation caused by double-circle shield tunnel construction under the normal work condition can be calculated, soil deformation under any deflection work condition can be calculated, simple program software can be complied, and the method is suitable for application and popularization.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction in tunnel engineering, and relates to a calculation method for soil deformation caused by construction deflection of a double-circle shield tunnel, which is suitable for soil deformation caused by construction of a shallow-buried double-circle shield tunnel in a soft soil layer Prediction. Background technique [0002] In the construction of urban shallow buried tunnels such as subway tunnels and underground pipe networks, the prediction and control of surface and underground soil deformation caused by construction is an extremely important topic. For traditional single-circle tunnel construction, the prediction of soil deformation usually adopts the empirical statistical method, that is, the soil settlement curve is assumed to be an inverted normal distribution curve, which is determined by the maximum settlement value and the settlement trough width coefficient. As a new tunn...

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Problems solved by technology

However, the cross-section of the double-circle shield tunnel is complex, and the traditional empirical statistical method is no longer applicable to the calculation of soil deformation caused by its construction, and the deflection of the shield during construction cannot be avoided, resulting in more complex soil deformation calculations

At present, there are also calculation methods that use random medium theory to predict soil deformation, but these methods cannot calculate the soil deformation below the depth of the tunnel top, and the obtained soil deformation field is incomplete

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