冻结法在常州地铁联络通道工程中的应用研究
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摘要
常州地铁1号线某联络通道位于富含承压水的粉砂层及粉土层中,为了规避联络通道开挖中出现涌水、漏沙等风险,确保施工安全,采用水平冻结法施工联络通道。该联络通道中心距为11.6m,冻结帷幕厚度在喇叭口处为1.5m,水平通道处为1.8m;冻土强度的设计指标为:单轴抗压强度不低于3.5MPa,抗折强度不低于2.0MPa,抗剪强度不低于1.5MPa。联络通道冻结帷幕平均温度低于-10℃,钻孔及冷冻装置安装时间为30d,积极冻结时间为45d,维护冻结时间为30d,总工期为110d。冻结效果符合预期,隧道开挖及构筑工程进展顺利,工程一次验收合格率达到100%,没有发生明显冻胀融沉及对周边环境影响的事故,实现预期目标。
The connected aisle of Changzhou Metro Line 1 is located in silty sand and silty soil layer which have rich confined water.In order to circumvent the risk of water burst and sand leakage during the excavation of the connected aisle,and to ensure the safety of construction,the horizontal freezing method was used for construction of it.The center distance of the connected aisle is 11.6 meters.The thickness of the frozen curtain is1.5 meters at the bell mouth,and 1.8 meters at the horizontal channel.The design parameters of the frozen soil strength are as follows: the uniaxial compressive strength is not lower than 3.5 MPa,the flexural strength is not lover than 2.OMPa,and the shear strength is not lover than 1.5 MPa.The average temperature of frozen curtain should be below-10℃ for this project.It took 30 days to drill and install the freezing equipment,45 days to positively freeze,and 30 days to keep frozed.The total time limit for the project was 110 days.The freezing effect of the project was desired.The tunnel excavation and the building project went well and the percent of pass in the first acceptance check reached 100%.There was no obvious frost heaving and thaw collapse,and there was no visible impact on the surrounding environment.Ultimately the expected goals were achieved.
The connected aisle of Changzhou Metro Line 1 is located in silty sand and silty soil layer which have rich confined water.In order to circumvent the risk of water burst and sand leakage during the excavation of the connected aisle,and to ensure the safety of construction,the horizontal freezing method was used for construction of it.The center distance of the connected aisle is 11.6 meters.The thickness of the frozen curtain is1.5 meters at the bell mouth,and 1.8 meters at the horizontal channel.The design parameters of the frozen soil strength are as follows: the uniaxial compressive strength is not lower than 3.5 MPa,the flexural strength is not lover than 2.OMPa,and the shear strength is not lover than 1.5 MPa.The average temperature of frozen curtain should be below-10℃ for this project.It took 30 days to drill and install the freezing equipment,45 days to positively freeze,and 30 days to keep frozed.The total time limit for the project was 110 days.The freezing effect of the project was desired.The tunnel excavation and the building project went well and the percent of pass in the first acceptance check reached 100%.There was no obvious frost heaving and thaw collapse,and there was no visible impact on the surrounding environment.Ultimately the expected goals were achieved.
引文
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[7]李剑,李志宏,胡向东.管幕冻结暗挖工法冻结止水效果分析[J].地下空间与工程学报,2015,11(3):751-759Li Jian,Li Zhihong,Hu Xiangdong.Analysis on water sealing effect of freezing-sealing pipe roof method[J].Chinese Journal of Underground Space and Engineering,2015,11(3):751-759
[8]崔云龙.简明建井工程手册[M].煤炭工业出版社,2003Cui Yunlong.A concise handbook of mine construction engineering[M].China Industry Publishing House,2003
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[10]李大勇,曹立雪,李健.地铁联络通道冻结施工中渗漏影响的数值分析[J].地下空间与工程学报,2012,8(1):111-116Li Dayong,Cao Lixu,LiJian.Analysion influence of seepage in a gross passage on frozen walls by numerical simulation method[J].Chinese Journal of Underground Space and Engineering,2012,8(1):111-116
[11]汪崇鲜,楼根达,马玉峰.繁华市区含水地层水平冻结及暗挖法施工[J].冰川冻土,2005(9):78-81Wang Chongxian,Lou Genda,Ma Yufeng.The technique of horizontal freezing and underground excavation within water bearing soft soil in busy sections of city[J].Joural of Glaciology and Geocryology,2005(9):78-81
[2]程桦,姚直书,张经双,等.人工水平冻结法施工隧道冻胀与融沉效应模型试验研究[J].土木工程学报,2007,40(10):80-85Cheng Hua,Yao Zhishu,Zhang Jingshuang,et al.A model test study on the effect of freeze heaving and subsidence for tunnel construction with artificial horizontal ground freezing[J].China Civil Engineering Journal,2007,40(10):80-85
[3]Heidkamp H,Katz C,Hofstetter C.Enlargement of theMarienplatz Metro Station-A complex tunnel project beneathMunich City Hall[J].Structural Engineer,2006,84(3):41-44
[4]郭瑞平.冻结法在地下工程施工中的应用[J].采矿技术,2007,7(2):47-48Guo Ruiping.Application of freezing method in underground engineering construction[J].Mining Technology,2007,7(2):47-48
[5]杨维好,杨志江,柏东良.基于与围岩相互作用冻结壁弹塑性设计理论[J].岩土工程学报,2013,35(1):175-181Yang Weihao,Yang Zhijiang,Bo Dongliang.Elastic-plastic design theory of frozen soil wall based on interaction between frozen wall and surrounding rock[J].Chinese Journal of Geotechmial Engineering,2013,35(1):175-181
[6]蔡海兵,彭立敏,郑腾龙.基于随机介质理论的隧道冻结期地表冻胀预测方法[J].中南大学学报(自然科学版,2014,45(12):251-258Cai Haibing,Peng Limin,Zheng Tenglong.Prediction method of surface frost heave based on stochastic medium theory in tunnel freezing period[J].Journal of Central South University(Science and Technology),2014,45(12):251-258
[7]李剑,李志宏,胡向东.管幕冻结暗挖工法冻结止水效果分析[J].地下空间与工程学报,2015,11(3):751-759Li Jian,Li Zhihong,Hu Xiangdong.Analysis on water sealing effect of freezing-sealing pipe roof method[J].Chinese Journal of Underground Space and Engineering,2015,11(3):751-759
[8]崔云龙.简明建井工程手册[M].煤炭工业出版社,2003Cui Yunlong.A concise handbook of mine construction engineering[M].China Industry Publishing House,2003
[9]付财,韩圣铭,韩玉福.浅覆土条件下地铁出入口冻结法暗挖施工技术[J].施工技术,2014,43(7):91-94Fu Cai,Han Shenming,Han Yufu.Mining method with freezing method used in subway passageway under shallow covering condition[J].Construction Technology,2014,43(7):91-94
[10]李大勇,曹立雪,李健.地铁联络通道冻结施工中渗漏影响的数值分析[J].地下空间与工程学报,2012,8(1):111-116Li Dayong,Cao Lixu,LiJian.Analysion influence of seepage in a gross passage on frozen walls by numerical simulation method[J].Chinese Journal of Underground Space and Engineering,2012,8(1):111-116
[11]汪崇鲜,楼根达,马玉峰.繁华市区含水地层水平冻结及暗挖法施工[J].冰川冻土,2005(9):78-81Wang Chongxian,Lou Genda,Ma Yufeng.The technique of horizontal freezing and underground excavation within water bearing soft soil in busy sections of city[J].Joural of Glaciology and Geocryology,2005(9):78-81