Method for calculating surrounding rock pressure of shallow tunnel

Abstract

The invention relates to the technical field of tunnel engineering. A method for calculating the surrounding rock pressure of a shallow tunnel comprises the following steps: selecting a convergence deformation monitoring point of the surrounding rock; constructing a structural mechanics model at the monitoring point; deriving a calculation relation between the convergence deformation and the surrounding rock pressure; substituting engineering actual data and convergence monitoring data into the calculation relation to calculate the displacement on the left and right sides of the monitoring point and the convergence deformation of the monitoring points; and calculating the surrounding rock friction angle and the surrounding rock pressure. The method analyzes a relationship between the convergence deformation and the surrounding rock pressure of the sidewall surrounding rock in the construction of a double side wall tunneling method, establishes the structural mechanics model, and obtains the surrounding rock pressure from the field monitoring data by means of back calculation. Compared with a calculation method that depends on empirical parameters, the method of the invnetion is more accurate and more represents the actual surrounding rock pressure of the tunnel, and the convergence deformation data of the tunnel is easier to obtain and the calculation is convenient and accurate.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for calculating surrounding rock pressure for shallow buried tunnels. Background technique [0002] Surrounding rock pressure is the pressure generated on the contact surface between the support and the surrounding rock when the deformation of the surrounding rock is blocked by the support structure during the stress redistribution process caused by the disturbance of the rock mass. It directly affects the structural design and construction of the tunnel. Choice of method. Due to the shallow buried depth of shallow tunnels, the impact caused by excavation will more directly affect the surface and surrounding buildings. [0003] The surrounding rock pressure caused by tunnel excavation is affected by many factors, not only related to geological factors such as rock mass structure, geological structure, rock physical and mechanical properties, groundwater, init...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical problem that when the empirical formula method is used to determine the surrounding rock pressure of the tunnel, the empirical parameters based on it cannot well represent the mechanical properties of the tunnel, so the traditional empirical formula method cannot obtain accurate surrounding rock pressure values. , to provide a calculation method for surrounding rock pressure in shallow tunnels, the method establishes a structural mechanics model by analyzing the relationship between the convergence deformation of the side wall surrounding rock and the pressure of the surrounding rock in the tunnel construction of the double side wall pilot tunnel method, The surrounding rock pressure obtained by inverse calculation from on-site monitoring data is more accurate and more representative of the actual surrounding rock pressure of the tunnel than the existing calculation method relying on empirical parameters, and the convergence deformation data of the tunnel is easier to obtain and the calculation is convenient and accurate

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