Simulation analysis method of three-dimensional value of power response of foundation ditch blasting to surrounding building structures

Abstract

The invention belongs to the technical field of geological blasting and discloses a simulation analysis method of a three-dimensional value of power response of foundation ditch blasting to surrounding building structures. The method includes the steps of adopting finite element software ABAQUS for conducting three-dimensional modeling; firstly, conducting model analysis on a structure system, analyzing self-vibration characteristics and giving a structural self-vibration frequency and a first 6-order formation; then, conducting three-dimensional value simulation on power response to the surrounding building structures in a blasting excavation process of subway deep foundation ditches, analyzing a change rule of the vibration speed of the structure system under the action of a blasting impact load, and giving a displacement cloud picture of the structure system and stress distribution of a framework structure. A guidance significance is provided for ultra-deep foundation ditch blastingengineering research under a complicated stratum condition in the future.

Description

technical field [0001] The invention belongs to the technical field of geological blasting, in particular to a three-dimensional numerical simulation analysis method for the dynamic response of foundation pit blasting to surrounding building structures. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] At present, when carrying out blasting excavation of foundation pits, whether it is the selection of the amount of explosives or the selection of the location or size of the blast hole, most of them are determined by empirical methods. The blasting excavation methods often adopted are as follows: [0004] Step 1. Due to the size of the foundation pit and the surrounding environment, the free space along the long axis of the foundation pit is large, and the blasting free surface should be arranged transversely along the long axis of the foundation pit, which can effectively contain flying stones along the...

AI Technical Summary

Problems solved by technology

[0012] (1) The existing blasting method will inevitably cause blasting vibration during the blasting excavation process, which will affect the safety of the surrounding building structures. A little carelessness will lead to very serious consequences; Provide a basis for the control measures of the dynamic disturbance of the structure;

[0013] (2) The setting of the relevant parameters of the existing blasting method largely depends on previous engineering experience, and the dynamic response of the soil and the superstructure of the foundation pit after the on-site blasting cannot be predicted, so that the parameters cannot be well optimized ;

Images