摘要
研究目的:基于楔形体极限平衡原理,在围岩压力计算步骤中引入自定义的水平压力占比系数η、广义水平侧压力系数λ,从而建立浅埋隧道围岩压力的统一表达模型及计算方法。该统一表达模型旨在以规则化的数学表达形式,取代《铁(公)路隧道设计规范》中分别关于超浅埋、浅埋(非偏压)、浅埋偏压3种不同工况下的围岩压力计算方法,可实现浅埋隧道围岩压力公式在计算形式的统一性,物理本质的同一性,计算步骤的一致性,克服行业规范中围岩压力计算公式在浅埋条件不同时表达各异、物理内涵晦涩、操作繁琐的理论缺陷。研究结论:(1)统一表达模型实现了超浅埋、浅埋(非偏压)、浅埋偏压时围岩压力计算公式在理论上的大一统,数学形式简约;(2)可推广至多层土、地表非水平含超载、楔形体非规则、小净距及连拱形式时的隧道围岩压力计算;(3)统一表达模型计算结果与规范公式计算结果一致;(4)统一表达模型及计算方法对行业规范的修订和补充具有重大意义。
Research purposes:Based on the limit equilibrium principle of wedge body,the horizontal pressure ratio coefficientηand generalized lateral pressure coefficientλwere introduced for getting a unified model and calculation method of shallow buried tunnel during the process of surrounding rock pressure calculation.The model aims to replace the calculation methods of surrounding rock pressure under three different working conditions of ultra-shallow buried,shallow buried(non-biased)and shallow buried bias in the Code for Design of Railway(Highway)Tunnel using a regular mathematical expression form.The uniformity of the calculation form,the uniformity of the physical essence and the consistency of the calculation steps of the surrounding rock pressure formula of shallow tunnel can be realized,and the theoretical defects of the pressure calculation formula in the industry specification,such as different expression,obscure physical connotation and complicated operation,can be overcome.Research conclusions:(1)The unified model achieves the unification of the calculation formula of surrounding rock pressure under ultra-shallow buried,shallow buried(non-biased)and shallow buried bias in theory,and the mathematical form is simple.(2)It can be extended to the calculation of tunnel surrounding rock pressure in the form of multi-layer soil,non-horizontal ground with surcharge,irregular sliding wedge,small clear distance and multiple-arch form.(3)The results of unified model are completely consistent with those of Code for Design of Railway(Highway)Tunnel.(4)The unified model and calculation method are of great significance to the revision and supplement of industry specifications.
作者
徐冲
王乾
XU Chong;WANG Qian(China Railway First Survey and Design Institute Group Co.Ltd,Xi'an,Shaanxi 710043,China;Qingdao Conson Development(Group)Co.Ltd,Qingdao,Shandong 266500,China)
出处
《铁道工程学报》
EI
北大核心
2022年第8期46-52,共7页
Journal of Railway Engineering Society
基金
陕西省重点研发计划(2022SF-198)
陕西省自然基金项目(2021JLM-50)
关键词
浅埋隧道
围岩压力
统一表达模型
shallow buried tunnel
surrounding rock pressure
unified model
