Tunnel partial excavation method median lamella supporting structure blasting safety monitoring method

Abstract

The invention relates to a tunnel partial excavation method median lamella supporting structure blasting safety monitoring method. The method specifically comprises the following operation steps thata numeric analysis model of a median lamella supporting structure under tunnel partial excavation blasting is built at first; the situation that a blast hole, R away from the median lamella supportingstructure, of the tunnel is exploded with the explosive quantity Q, the relation between the impact strength of explosion to the median lamella supporting structure and the explosive quantity Q at the distance R is built, the critical explosive quantity Q<criticality> is substituted into the Sardowski empirical formula which is as shown in the specification, and the explosion vibration velocity V<criticality> of the position, L away from the explosion tunnel face, of the median lamella supporting structure under the critical explosive quantity Q<criticality> is obtained; the explosion vibration velocity V is obtained through actual measurement of an explosion vibration meter; and the actually measured vibration velocity V is compared with the V<criticality>, if the V is larger than the V<criticality>, the control standard is exceeded, the monitoring explosive quantity is adjusted according to the monitoring result till the V is smaller than the V<criticality>. The method is simple andeasy to implement, the situation that a stress or strain sensor is directly installed on a median lamella is avoided, and the explosion construction safety of the median lamella can be evaluated.

Description

Technical field: [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for monitoring the blasting safety of a partition support structure in a tunnel partial excavation method. Background technique: [0002] In recent years, with the development of high-speed railways, highways and underground rail transit projects, the number of tunnel projects has also shown a trend of increasing year by year. When the drilling and blasting method of partial excavation is used for construction, the harmful effects such as vibration, shock wave and flying stones generated during the blasting construction process will inevitably have a negative impact on safe production, especially on the initial support structure of the tunnel. . When the tunnel is constructed by CD or CRD construction method, the support structure of the intermediate wall and the initial support are closed to form a ring, which together play a role in supporting...

AI Technical Summary

Problems solved by technology

[0004] Therefore, in view of the difficult problem in the prior art that it is difficult to solve the safety monitoring of the partition wall support structure under the action of tunnel explosion shock waves and flying stones, a design is sought to provide a monitoring method for the blasting safety of the partition wall support structure in the tunnel excavation method. , this method can obtain the safety state of the middle partition and ensure the blasting safety of the support structure

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