基于实测解冻温度的联络通道冻结法融沉注浆优化研究
发布时间：2018-11-24 19:45
【摘要】：【目的】冻结法施工中,为了工后跟踪注浆及控制融沉,必须了解地铁联络通道解冻温度发展规律。【方法】以软土隧道联络通道冻结法工程为背景,对解冻温度场、深层土体温度变化规律等进行了实测;为更有效控制融沉,对其跟踪注浆时机及顺序、注浆工艺及材料进行了优化。【结果】联络通道解冻20 d内,部分土体温度开始达到0℃附近,冻土进入相变阶段;入土深度越大,土体相变阶段持续时间越长;软土融沉主要发生在解冻前2个月,侧墙及顶部完全解冻需要4个月,则跟踪注浆至少应持续的时间为3~4个月。【结论】控制融沉过程中,注浆应按照由底部→顶部→侧墙的顺序先后进行;同时要根据实测温度和地面沉降量实行双控标准。合理安排施工顺序和注浆参数,加强监测,可以进一步使得联络通道周边土层受融沉影响范围缩小,降低联络通道顶部受融沉的影响程度。
[Abstract]:[objective] in order to track grouting and control thawing settlement after construction, it is necessary to understand the development rule of the thawing temperature in the connection channel of subway. [methods] the thawing temperature field is studied based on the freezing method of tunnel connection channel in soft soil. The temperature variation law of deep soil is measured. In order to control thawing subsidence more effectively, the timing and sequence of grouting, grouting process and material were optimized. [results] within 20 days of thawing through the contact channel, the temperature of some soil began to reach 0 鈩，
本文编号：2354817
[Abstract]:[objective] in order to track grouting and control thawing settlement after construction, it is necessary to understand the development rule of the thawing temperature in the connection channel of subway. [methods] the thawing temperature field is studied based on the freezing method of tunnel connection channel in soft soil. The temperature variation law of deep soil is measured. In order to control thawing subsidence more effectively, the timing and sequence of grouting, grouting process and material were optimized. [results] within 20 days of thawing through the contact channel, the temperature of some soil began to reach 0 鈩，
本文编号：2354817
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2354817.html
