Tunnel blasting soil-rock stratum vibration law testing method based on model test

Abstract

The invention provides a tunnel blasting soil-rock stratum vibration law test method based on a model test, and the analysis method comprises the following steps: obtaining a soil-rock stratum geological profile of a blasting site, and determining the size and physical and mechanical parameters of a rock-soil layer; determining a geometric similarity ratio, a strength similarity ratio, a time similarity ratio and a density similarity ratio of the soil rock stratum physical model; further, determining an explosion source, a soil-rock similar material and a ratio, and arranging a special model box for tunnel explosion; then, assembling a similar material in the model box, setting a blast hole position, and embedding a vibration sensor; charging and igniting in the blast hole, and collecting a blasting vibration signal through a dynamic signal testing system; and finally obtaining the vibration law of the tunnel blasting soil-rock stratum. According to the method, by constructing the soil rock stratum blasting vibration model test, the factors such as site characteristics and test instruments do not need to be considered, the blasting vibration test instruments can be flexibly, simply and conveniently arranged, the vibration data of the whole blasting site can be obtained, and the method has higher engineering application value.

Description

technical field [0001] The invention relates to the technical field of tunnel blasting, in particular to a method for testing the vibration law of tunnel blasting soil and rock formations based on model tests. Background technique [0002] With the acceleration of urbanization and the increasingly narrow living space of people, more and more underground spaces are being developed and utilized. As an important structural form of underground engineering, tunnels are commonly used in urban subways, underground integrated pipe corridors, water diversion culverts and other infrastructure. The drilling and blasting method is often used in tunnel excavation projects because of its low cost and simple construction, but at the same time, this method will also bring harmful effects such as blasting vibration. This vibration effect will affect the stability of the surface structure, so it is necessary to control the blasting. Vibration magnitude, attenuating harmful effects. Blasting...

AI Technical Summary

Problems solved by technology

[0003] At present, in engineering practice, there are mainly two methods to obtain the vibration law of soil and rock formations. One is to conduct in-situ testing, and to place vibration sensors at the test points by drilling holes in the blasting site to obtain blasting vibration data at the engineering site. Due to such The method requires custom-made extensible sensors, and the test cost is high, which is not conducive to popularization and application. At the same time, the site geological conditions are complex, and it is difficult to establish the correlation between blasting vibration data and site conditions; The earth-rock formation structure is constructed in the soil layer, and vibration sensors are embedded to obtain vibration data during the laying process. Although this method controls the geological conditions of the site, the site construction cost is too high, and the selection of the test site is also relatively difficult

Due to the defects of high test difficulty, high cost, and low applicability in the above methods, it is necessary to propose a new method for testing the vibration law of soil and rock formations in tunnel blasting to overcome the problems in the existing methods

Images