摘要
对天津地铁4号线富水联络通道水平冻结法施工工艺进行了总结分析,并结合盐水温度、测温孔温度以及泄压孔压力等参数的监测结果对冻结施工效果进行评价。分析结果表明:为防止冻结初期地下水大量渗漏,必须加快冻结初期温度的下降速率,但这会导致去回路盐水温度差值过大,因此必须在地下水得到冻结后尽快将盐水下降速率调低;在冻结区域范围内铺设保温材料,以减少土体与外界环境的热交换,从而确保良好的冻结效果;冻结施工过程中,去回路盐水温差控制在2℃左右,冻结40 d后泄压无水流出,冻结完成后土体冻结温度低于-10℃,均表明本次冻结帷幕交圈效果良好,可以为后续土体开挖施工提供较好的稳定性。
The construction technologies of horizontal freezing method for water-rich connecting channel of Tianjin Metro Line 4 are summarized and analyzed,and the freezing construction effect is evaluated from the monitoring results of salt water temperatures,temperature of temperature measurement holes and pressure of pressure relief holes.The results show that in order to prevent a large amount of ground water leakage at the initial stage of freezing,it is necessary to speed up the decline rate of temperature at the initial stage of freezing,but this would lead to excessive temperature difference of salt water in the de circuit.Therefore,the decline rate of salt water must be reduced as soon as possible after the ground water is frozen;the insulation materials in the frozen area are layed to reduce the heat exchange between the soil and the external environment,so as to ensure the good freezing effect.In the process of freezing construction,the temperature difference of salt water in the de circuit is controlled around 2℃;the pressure is released after freezing for 40 days,there is no water outflow;after freezing,all the soil freezing temperature is lower than-10℃,which indicate that the freezing curtain has a good effect and can provide good stability for subsequent soil construction.
作者
孟宪美
MENG Xianmei(The Fifth Engineering Co.,Ltd.of China Railway 18th Bureau Group,Tianjin 300000,China)
出处
《国防交通工程与技术》
2022年第3期47-50,34,共5页
Traffic Engineering and Technology for National Defence
关键词
富水联络通道
水平冻结法
盐水温度
测温孔
泄压孔
rich water connection channel
horizontal freezing method
salt water temperature
temperature measuring hole
pressure relief hole
