Method for determining smooth shaped charge blasting parameter in stratified rock mass tunnel

Abstract

The invention discloses a method for determining a smooth shaped charge blasting parameter in a stratified rock mass tunnel, comprising the following steps of designing a shaped charge pipe influence factor lambda; calculating a detonation pressure P generated by a smooth blasting detonation product in a general state; calculating strain energy transformed by blasting; calculating a relation among detonation pressures P1, P2, and lambda and P, wherein the detonation pressure P1 and P2 are generated by shaped charge blasting under the action of the shaped charge pipe; calculating tensile stress and compressive stress borne by a rock face under shaped charge blasting; calculating a relation between angles formed by a periphery blast-hole distance and a stratified rock mass structural plane in the coulomb criterion condition; and calculating a relation between the periphery blast-hole distance and the lambda in the maximum tension stress criterion condition. According to the method, proper values of corresponding change of the periphery blast-hole distance can be accurately calculated under the influence of different shaped charge blasting stiffness lambda when the structural plane in the stratified rock mass t is different from the periphery blast-hole distance angle, thus the problems of serious over-blasting in the stratified rock mass and irregular excavation contour lines are solved, and the excavation contour lines of the smooth shaped charge blasting are controlled simply and accurately.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for determining parameters of smooth-surface concentrated energy blasting in layered rock mass tunnels. Background technique [0002] Smooth surface blasting is a controlled blasting technology that makes the outline after blasting conform to the design requirements through correct selection of blasting parameters and reasonable construction methods, and sub-regional and segmental differential blasting. The smooth surface blasting technology is widely used in tunnel blasting because it can obtain an ideal blasting surface, without over-excavation or under-excavation. The energy-gathering smooth surface blasting is based on the smooth surface blasting. The energy-gathering device is used to concentrate the energy of the explosive and transfer it to the predetermined blasting direction, so as to achieve better control of the energy release of the explosive, and t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a scientific and accurate method for determining the parameters of smooth surface energy-concentrating blasting in layered rock mass tunnels, so as to solve the problem of serious overbreak in smooth blasting due to the existence of structural surfaces in layered rock mass tunnels, and the Surface unevenness etc.

Images