海域低渗透性土层盾构隧道外荷载特征
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摘要
选取珠海横琴马骝洲西线隧道WK2+600断面为监测断面,对潮汐作用下盾构管片结构上的外荷载进行跟踪测试。测试结果表明:当隧道埋深大于波浪作用下超孔隙水压力的影响深度时,孔隙水压力不受波浪周期的影响,潮汐荷载通过静水压力的形式作用于衬砌结构上;隧道贯通后的水压力低于理论静水压力;对于修建在低渗透性地层中的水下隧道,若外水压力取全水头则结构设计偏向于安全。围岩压力的变化与水位的变化密切相关,并且受波浪周期的影响;隧道外荷载通过土压力波动的形式响应波浪荷载。
The WK2+600 cross-section of the west route tunnel in Maluzhou Island of Zhuhai Hengqin was selected as the monitoring section,and tracking and testing of the external load on the shield segment structure under the action of tide was carried out.T he test results show that the pore water pressure is not affected by the wave period and the tidal load acts on the lining structure in the form of hydrostatic pressure when the tunnel depth is greater than the influence depth of ultra pore water pressure under the wave action. The water pressure is lower than theoretical hydrostatic pressure after tunnel penetration,and the structural design is biased toward safety if the external water pressure takes full head for the underwater tunnels built in low permeability formation.T he change of surrounding rock pressure is closely related to the change of water level and is influenced by the wave period.T he external load of the tunnel responds to the wave load in the form of soil pressure fluctuation.
The WK2+600 cross-section of the west route tunnel in Maluzhou Island of Zhuhai Hengqin was selected as the monitoring section,and tracking and testing of the external load on the shield segment structure under the action of tide was carried out.T he test results show that the pore water pressure is not affected by the wave period and the tidal load acts on the lining structure in the form of hydrostatic pressure when the tunnel depth is greater than the influence depth of ultra pore water pressure under the wave action. The water pressure is lower than theoretical hydrostatic pressure after tunnel penetration,and the structural design is biased toward safety if the external water pressure takes full head for the underwater tunnels built in low permeability formation.T he change of surrounding rock pressure is closely related to the change of water level and is influenced by the wave period.T he external load of the tunnel responds to the wave load in the form of soil pressure fluctuation.
引文
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[10]刘庭金,邓飞皇,莫海鸿.水位下降对地铁盾构隧道的影响分析[J].现代隧道技术,2008,45(增1):207-210.
[11]戴李春,齐俊,张宁宁,等.水压力作用下公路隧道衬砌受力特性研究[J].铁道建筑,2015,55(12):77-79.
[2]于洪丹,陈卫忠,郭小红,等.潮汐对跨海峡隧道衬砌稳定性影响研究[J].岩石力学与工程学报,2009,30(5):2905-2914.
[3]王春梅.低渗透性地层浅埋隧道防排水控制措施研究[J].铁道标准设计,2012,56(12):81-84.
[4]高健.考虑渗流的盾构隧道掘进面失稳分析[D].天津:天津大学,2010.
[5]蔡臣,黄涛,贺玉龙.广深港客运专线下穿珠江狮子洋隧道渗流场数值研究[J].铁道建筑,2013,53(6):68-70.
[6]SCHOTTE K,NAGY W,NUTTENS T,et al.Impact of Tidal Level Fluctuations on the Structural Behaviour of a Segmental Tunnel Lining[J].Tunnelling and Underground Space Technology,2017,64:184-208.
[7]段峰虎,史清华,樊福发.湛江湾跨海深水盾构隧道外荷载监测试验研究[J].广东水利水电,2014(3):1-5.
[8]张君禄,段峰虎,廖文来,等.湛江湾跨海盾构隧道管片现场监测试验研究[J].岩石力学与工程学报,2014(增1):2878-2884.
[9]林存刚.盾构掘进地面隆陷及潮汐作用下江底盾构隧道性状研究[D].杭州:浙江大学,2014.
[10]刘庭金,邓飞皇,莫海鸿.水位下降对地铁盾构隧道的影响分析[J].现代隧道技术,2008,45(增1):207-210.
[11]戴李春,齐俊,张宁宁,等.水压力作用下公路隧道衬砌受力特性研究[J].铁道建筑,2015,55(12):77-79.