公路黄土隧道仰拱结构力学特性现场试验研究  

Field Test Study on Mechanical Characteristics of Arch Structures in Highway Loess Tunnels

作　　者：何信 孙旭亮 宿钟鸣 朱谭谭 朱焕焕 HE Xin;SUN Xuliang;SU Zhongming;ZHU Tantan;ZHU Huanhuan(Key Laboratory of Highway Construction&Maintenance Technology in Loess Region,Taiyuan,Shanxi 030006,China;School of Highway,Chang'an University,Xi'an,Shaanxi 710064,China)

机构地区：[1]黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006 [2]长安大学公路学院,陕西西安710064

出　　处：《河北工程大学学报（自然科学版）》2024年第4期67-72,81,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：山西省基础研究计划项目(20210302123359)。

摘　　要：为研究公路黄土隧道仰拱结构受力特性,以丰收岭公路黄土隧道为工程背景,选取两个不同埋深隧道断面,通过埋设压力盒、混凝土应变计、钢筋计、表面应变计等传感器,研究了公路黄土隧道仰拱围岩压力、喷射混凝土应力、钢架应力、初期支护和二次衬砌间接触压力、二次衬砌混凝土应力、钢筋应力等的演化规律,分析了黄土隧道仰拱结构受力特性。试验结果表明:不同埋深条件下黄土隧道仰拱结构受力特征存在显著差异;埋深较大断面的仰拱围岩压力明显大于埋深较浅断面的仰拱围岩压力;不同埋深条件下,相同横断面形式和相同围岩条件的黄土隧道仰拱结构受力特征不同,但拱脚位置均易出现拉应力;埋深较大的隧道仰拱结构易呈现上部受压下部受拉状态;黄土隧道仰拱地基承载力对仰拱受力特征影响显著。To study the mechanical characteristics of the inverted arch structure of highway loess tunnel,taking the Fengshuiling highway loess tunnel as the engineering background,two tunnel sections with different embedded depths were selected.By embedding pressure boxes,concrete strain gauges,rebar gauges,surface strain gauges and other sensors,the evolution laws of surrounding rock pressure,shotcrete stress,steel frame stress,contact pressure between primary support and secondary lining,se-condary lining concrete stress,and reinforcement stress of the highway loess tunnel invert were studied,and the mechanical characteristics of the loess tunnel invert structure were analyzed.The experimental results show that the stress characteristics of the inverted arch structure of the loess tunnel are significantly different under different embedded depths.The pressure of the inverted arch surrounding rock in the section with a larger embedded depth is obviously greater than that in the section with a smaller embedded depth.Under different embedded depths,the stress characteristics of the inverted arch structure of the loess tunnel with the same cross section form and the same surrounding rock condition are diffe-rent,but the position of the arch foot is prone to the tensile stress.The tunnel invert structure with a large embedded depth is easy to show the states of upper compression and lower tension.The bearing capacity of the foundation of the loess tunnel invert has a significant effect on the mechanical characte-ristics of the invert.

关 键 词：黄土隧道 仰拱 受力特征 试验研究 演化过程 

分 类 号：U456[建筑科学—桥梁与隧道工程]