摘要
以南京地铁四号线锁金村站右线盾构始发端头加固为例,经多种加固方案比选确定了水平冻结加固法。通过实测杯型冻结壁温度场,分析了干管、分支回路盐水温度变化规律,以及不同深度、不同冻结加固区和不同土质的土体温度变化特征。结果表明:分支回路中盐水温度均匀,其变化与干管盐水温度变化一致;在整个冻结期间,任意时刻冻结壁杯体加固区温度始终高于冻结壁杯底加固区;同一测温孔中,冻结前期距地连墙水平距离越远温度越高,冻结后期距地连墙水平距离越远温度越低;在相同冻结能量和冻结时间内,淤泥质粉质黏土比混合土温度高。
Taking the shield launching end wall reinforcement project located at the right lane of Suojincun in Nanjing metro station No.4 as an example, the horizontal freezing reinforcement method was determined by comparing and selecting several reinforcement schemes, the brine temperature change rules of main pipe and each duplexure was analyzed through actual measurement of the cup-shaped freezing soil wall temperature field, and the temperature change characteristics of soil in different depth, freezing reinforcement regions and different soil texture were discussed. The results showed that the brine temperature in duplexure is even, change of which is consistent with main pipe, the reinforcement region temperature in cup body of freezing wall is always higher than temperature at cup bottom at any time during the whole freezing period, the farther the horizontal distance to underground diaphragm wall, the higher the temperature is at the early stage of freezing and the lower the temperature is at the end stage of freezing in the same thermometer hole, and the temperature of muddy silty clay is higher than the mixed soil if the freezing energy and freezing time is same.
出处
《铁道建筑》
北大核心
2015年第8期39-43,共5页
Railway Engineering
基金
住房和城乡建设部科学技术项目(2014-k3-029)
关键词
水平冻结
盾构始发端头
土体加固
温度
Horizontal freezing
Shield launching end wall
Soil reinforcement
Temperature
