摘要
A nuclear explosion in the rock mass medium can produce strong shock waves,seismic shocks,and other destructive effects,which can cause extreme damage to the underground protection infrastructures.With the increase in nuclear explosion power,underground protection engineering enabled by explosion-proof impact theory and technology ushered in a new challenge.This paper proposes to simulate nuclear explosion tests with on-site chemical explosion tests in the form of multi-hole explosions.First,the mechanism of using multi-hole simultaneous blasting to simulate a nuclear explosion to generate approximate plane waves was analyzed.The plane pressure curve at the vault of the underground protective tunnel under the action of the multi-hole simultaneous blasting was then obtained using the impact test in the rock mass at the site.According to the peak pressure at the vault plane,it was divided into three regions:the stress superposition region,the superposition region after surface reflection,and the approximate plane stress wave zone.A numerical simulation approach was developed using PFC and FLAC to study the peak particle velocity in the surrounding rock of the underground protective cave under the action of multi-hole blasting.The time-history curves of pressure and peak pressure partition obtained by the on-site multi-hole simultaneous blasting test and numerical simulation were compared and analyzed,to verify the correctness and rationality of the formation of an approximate plane wave in the simulated nuclear explosion.This comparison and analysis also provided a theoretical foundation and some research ideas for the ensuing study on the impact of a nuclear explosion.
基金
supported by the General Program of the National Natural Science Foundation of China(Grant No.52074295)
the Special Fund for Basic Scientific Research Business Expenses of Central Universities(Grant No.2022YJSSB06)
supported by State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and technology,Beijing,China(Grant No.SKLGDUEK202217).
作者简介
Corresponding author:Wei Ming,obtained his BSc degree in Civil Engineering from University of Jinan in 2005,MSc degree in Disaster Prevention and Reduction Engineering and Protective Engineering from Hebei University of Technology(now North China University of Science and Technology)in 2008,and his PhD in Geotechnical Engineering from China University of Mining and Technology-Beijing in 2023.He was awarded the title of Excellent Doctoral Graduate of State Key Laboratory for GeoMechanics and Deep Underground Engineering,China University of Science and Technology-Beijing,and Beijing Municipal Commission of Education in the same year.His research interests include:(1)deformation behavior of soft rock under complex geological conditions in deep tunnel engineering,(2)influence law of coupling mechanism between tunnel surrounding rock and anchor cable support on controlling large-deformation disaster of soft rock tunnel,(3)mechanism of large-deformation disaster of surrounding rock during deep tunnel excavation process,and(4)large deformation control of new NPR materials and tunnel anti-explosion dynamics mechanism.He has been participated in a large number of Chinese national projects.E-mail addresses:mingweicumtb@163.com;Corresponding author:Zhigang Tao,College of Civil and Architecture Engineering,North China University of Science and Technology,Tangshan,063210,China.E-mail addresses:taozhigang@cumtb.edu.cn。
