Calculation method for bottom displacement of small clear distance heavy-duty railway crossing tunnel

Abstract

The invention discloses a calculation method for small clear distance heavy haul railway cross tunnel bottom placement. The method comprises the following steps that: (i) calculating vertical concentrated force applied to a tunnel bottom when a heavy haul railway runs; (ii) calculating the tunnel bottom placement under a railway load function; (iii) determining the peripheral stress state, which is affected by a train load, of a new tunnel under a railway; (iv) calculating existing tunnel displacement caused by the digging of the tunnel under the railway; and (v) calculating the influence of the train load and the existing tunnel displacement under the digging function of the tunnel under the railway. By use of the method, an intersection surrounding rock is subjected to stress analysis, aheavy haul additional load, existing tunnel structure intensity, rock body intensity characteristics, cross tunnel burial depth and cross tunnel interlayer rock pillar height, the small clear distance heavy haul railway cross tunnel bottom placement value is analyzed and calculated, the deformation settling volume of the constructed tunnel in a tunnel traversing engineering so as to meet the normal operation of the existing tunnel and the requirement of the safety construction of the new tunnel.

Description

technical field [0001] The invention belongs to a method for calculating the displacement of the bottom of a tunnel, and in particular relates to a method for calculating the displacement of the bottom of a cross tunnel of a small clear distance heavy-duty railway crossing. Background technique [0002] As the density of my country's traffic network increases year by year, various types of high-risk crossing tunnels are increasing year by year. Among them, due to the influence of factors such as the heavy axle of heavy-duty trains on the upper part and the high impact load amplitude of the small-clear-distance heavy-haul railway crossing tunnel, the construction of a new tunnel at the lower part of the crossing section will pose a great risk to the safe operation of the existing heavy-haul railway at the upper part. In general, the overall safety of the tunnel can be judged objectively and effectively by studying the displacement and deformation laws of the existing tunnel s...

AI Technical Summary

Problems solved by technology

Because the existing research does not provide a simple and fast prediction method for the displacement of the bottom of the small-distance heavy-duty railway crossing tunnel, and most of the settlement calculations of the existing tunnel structures do not consider the additional load of the heavy-duty train on the tunnel crossing section, resulting in both The reliability of the calculation of the displacement and settlement of existing tunnels is insufficient, and the normal operation of existing tunnels and the safe construction of newly built tunnels under passage cannot be effectively guaranteed

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