摘要
通过应用Drucker-Prager准则和弹塑性力学方法,得到圆形水工隧洞的最小覆盖层厚度的解析解,分析中间主应力、渗流、岩体强度参数对最小覆盖层厚度的影响规律。结果表明:随着中间主应力系数的增大,最小覆盖层厚度先减小后增大,当其取0.7时达到最小值4.35m。当中间主应力系数取0、0.7、1.0且围岩与衬砌的渗透系数比k_(d)/k_(c)≥10时,最小覆盖层厚度随着该比值的增大而增大,但当k_(d)/k_(c)≥1000后,最小覆盖层厚度不再受到中间主应力系数的影响,而是趋于确定值;当k_(d)/k_(c)≥2000、中间主应力系数取0.7时,最小覆盖层厚度也达到最小值4.35m。当固定围岩强度参数,并且中间主应力系数取0.7时的最小覆盖层的厚度最小;此状态下,最小覆盖层厚度随着渗透系数比的减小而减小,当该比值取10时的隧洞最小覆盖层厚度最小。
By applying the Drucker-Prager criterion and elastoplastic mechanical methods,an analytical solution of the minimum covering thickness of a circular hydraulic tunnel is obtained.The influences of the intermediate principal stress,seepage and strength parameters of surrounding rock on the minimum covering thickness are analyzed.The results show that with the increasing of the intermediate principal coefficient,the minimum covering thickness decreases first and then increases,and reaches a minimum value of 4.35m when the intermediate principle coefficient takes 0.7.When the intermediate principal stress coefficient is 0,0.7,1.0,and the permeability coefficient ratios of surrounding rock and lining k_(d)/k_(c) 10,the minimum covering thickness increases with the ratios′increasing.However,after k_(d)/k_(c) 1000,the minimum covering thickness is no longer influenced by the intermediate principal stress coefficient,but tends to established values.When k_(d)/k_(c) 2000 and the intermediate principal stress coefficient is taken at 0.7,the minimum covering thickness also reaches a minimum of 4.35m.The thickness of the minimum covering is minimum when the surrounding rock strength parameter is determined and the intermediate principal stress coefficient is 0.7.In this state,the minimum covering thickness decreases with the permeability coefficient ratios′decreasing.When the ratio is taken 10,the hydraulic tunnel′s minimum covering thickness is minimum.
作者
程长清
杨自友
赵巧明
Cheng Changqing;Yang Ziyou;Zhao Qiaoming(Jiangsu Union Technical Institute,Wuxi Communications Branch,Wuxi,Jiangsu 214151,China;College of Civil Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China)
出处
《黑龙江工业学院学报(综合版)》
2025年第11期138-143,共6页
Journal of Heilongjiang University of Technology(Comprehensive Edition)
基金
2022年江苏省无锡交通高等职业技术学院横向科研项目(项目编号:HXKT202203)
江苏省交通运输科技项目(项目编号:2025QD05)
安徽省高校自然科学研究重点项目(项目编号:KJ2021A0610)。
关键词
水工隧洞
强度理论
渗流
最小覆盖层厚度
中间主应力
hydraulic tunnel
strength theory
seepage
the minimum covering thickness
intermediate principal stress
