冻土隧道动态信息反馈施工控制技术
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摘要
为形成多年冻土区隧道动态信息反馈施工控制技术,主要研究了隧道施工冻融圈响应规律与控制要点。结果表明:喷射混凝土前,由洞内至围岩围岩内部,其温度逐渐下降。同一深度处围岩温度又会随时间缓慢增长;喷射混凝土后,尽管围岩越深部其温度逐渐降低,但浇筑混凝土产生的水化热对整个围岩温度场影响显著,总体来看,距离洞壁深度与水化热效果影响成反比,当深度超过2m,围岩受水化热作用轻微。喷射混凝土越晚,同一深度处围岩温度越高,冻融圈深度越大。
In order to form dynamic information feedback construction control technology for tunnels in permafrost regions, the response law and control points of freeze-thaw zone in tunnel construction are mainly studied. The results show that the temperature decreases gradually from the inside of the tunnel to the inside of the surrounding rock before shotcreting. At the same depth, the temperature of surrounding rock will increase slowly with time. After shotcreting, although the temperature of surrounding rock decreases gradually with the depth of shotcrete, the hydration heat produced by pouring concrete has a significant effect on the temperature field of surrounding rock. Generally speaking, the distance from the tunnel wall is inversely proportional to the effect of hydration heat. When the depth exceeds 2 m, the surrounding rock is affected by water. Thermochemical effect is slight. The later the shotcrete is, the higher the surrounding rock temperature is at the same depth, and the deeper the freeze-thaw zone is.
In order to form dynamic information feedback construction control technology for tunnels in permafrost regions, the response law and control points of freeze-thaw zone in tunnel construction are mainly studied. The results show that the temperature decreases gradually from the inside of the tunnel to the inside of the surrounding rock before shotcreting. At the same depth, the temperature of surrounding rock will increase slowly with time. After shotcreting, although the temperature of surrounding rock decreases gradually with the depth of shotcrete, the hydration heat produced by pouring concrete has a significant effect on the temperature field of surrounding rock. Generally speaking, the distance from the tunnel wall is inversely proportional to the effect of hydration heat. When the depth exceeds 2 m, the surrounding rock is affected by water. Thermochemical effect is slight. The later the shotcrete is, the higher the surrounding rock temperature is at the same depth, and the deeper the freeze-thaw zone is.
引文
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[15] 王晓睿,王元汉,张世海.模糊推理的综合评判系统在隧道围岩智能分类中的应用研究[J].公路交通科技,2009,26(3):100-104.
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[2] 姚红志,张晓旭,董长松,等.多年冻土区公路隧道保温隔热层铺设方式及材料性能对比分析[J].中国公路学报,2015,28(12):106-113.
[3] 陈建勋,罗彦斌,万利,等.超大跨度公路隧道研究现状与面临的挑战[J].筑路机械与施工机械化,2018,35(6):36-44.
[4] 谭忠盛,贺维国,王梦恕.琼州海峡工程地质条件及铁路隧道方案研究[J].隧道建设(中英文),2018,38(1):1-7.
[5] 谭忠盛,况成明,杨小林,等.风火山多年冻土隧道施工爆破技术研究[J].岩石力学与工程学报,2006(5):1056-1061.
[6] 汤国璋,王星华.温度场控制在多年冻土隧道施工中的作用[J].岩土力学,2007(3):455-460.
[7] 李海光.隧道扩挖围岩与初期支护间的压力监测分析[J].筑路机械与施工机械化,2015,32(8):70-72.
[8] 张学富,张闽湘,杨风才.风火山隧道温度特性非线性分析[J].岩土工程学报,2009,31(11):1680-1685.
[9] 韩风雷,张学富,喻文兵,等.铜锣山隧道软弱破碎围岩受力与变形分析[J].重庆交通大学学报(自然科学版),2017,36(3):22-29.
[10] 韩风雷.寒区隧道融化盘时空变化规律研究[D].重庆:重庆交通大学,2014.
[11] 况成明.高海拔隧道--青藏铁路风火山隧道施工关键技术[J].现代隧道技术,2006(3):23-30.
[12] 周元辅,张学富,周元江.冻土隧道的保温隔热层参数设计新方法[J].科学技术与工程,2017,17(14):314-319.
[13] 周元辅,张学富.多年冻土隧道工程中的隔热层参数优化设计研究[J].现代隧道技术,2014,51(4):127-132.
[14] 宋冶,廖凯,刘玉勇.高原冻土隧道冻融圈监测系统[J].现代隧道技术,2013,50(6):14-18,79.
[15] 王晓睿,王元汉,张世海.模糊推理的综合评判系统在隧道围岩智能分类中的应用研究[J].公路交通科技,2009,26(3):100-104.
[16] 王晓睿,贾晓风,王元汉.基于免疫算法的隧道围岩松动圈参数智能反演分析[J].中外公路,2009,29(1):154-156.