礁灰岩硐室开挖稳定性及长期蠕变特性研究  

Study on the coral reef limestone chamber excavation stability and long-term creep characteristics

作　　者：张宁[1] 马林建 王建平 耿汉生 陈梓玮 张效晗 ZHANG Ning;MA Linjian;WANG Jianping;GENG Hansheng;CHEN Ziwei;ZHANG Xiaohan(Nanjing Technology University;State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,PLA Army Engineering University;PLA Navy Research Academy;Nanjing University of Science and Technology)

机构地区：[1]南京工业大学 [2]陆军工程大学爆炸冲击防灾减灾全国重点实验室 [3]海军研究院 [4]南京理工大学

出　　处：《防护工程》2024年第4期22-27,共6页Protective Engineering

基　　金：国家自然科学基金优秀青年科学基金项目(52222110);江苏省自然科学基金面上项目(BK20211230)

摘　　要：针对岛礁礁灰岩硐室施工开挖及长期稳定性问题,分析了礁灰岩岩性特征,根据礁灰岩三轴压缩和蠕变试验数据,采用Norton蠕变本构模型和Mohr-Coulomb强度准则拟合得到礁灰岩本构参数和强度参数。取典型地下工程硐室建立了礁灰岩硐室平面应变有限元模型,模拟了50、100、200、300 m等4种埋深下硐室开挖施工和50年围岩收敛变形和破坏区分布。结果表明,岛礁礁灰岩硐室小于100 m埋深情况下,整体蠕变变形可控,礁灰岩硐室长期稳定性能够得到保证。Aiming at the problems of excavation and long-term stability of the reef limestone chamber,this paper analyzed the lithological characteristics of the coral reef limestone.Based on the triaxial compression test and creep test data of the reef limestone,the parameters of the Norton constitutive model and the Mohr-coulomb strength criterion were obtained.A plane strain finite element model of a reef limestone chamber with a typical underground chamber design was established,the chamber excavation construction at four different burial depths(50 m,100 m,200 m,and 300 m),a 50-year surrounding rock deformation and damage area distribution were simulated.The results showed that the chamber with a burial depth of less than 100 m has fewer plastic zones and smaller deformation,the overall creep deformation was controllable,and the long-term stability of the reef limestone chamber can be guaranteed.

关 键 词：礁灰岩 硐室 开挖稳定性 长期蠕变 

分 类 号：P75[天文地球—海洋科学]