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依托南京地铁10号线梦都大街站一号出入口及风道加固工程,经方案比选并针对本工程的水文地质情况及上部横穿敏感结构的特殊条件,提出一种新工法——全断面注浆+顶部管棚+矩形水平冻结加固。通过实测加固土体温度、地表及管线位移,获得了加固土体的温度场分布及地表位移规律。结果表明:矩形侧向冻结壁向内、外发展速度的比值约为1.54;在相同冻结能量和冻结时间内,在粉土夹粉砂层和淤泥质粉质黏土夹粉砂层中冻结壁发展速度的比值约为1.72;冻结孔施工阶段暗挖通道两侧地表沉降量较大,而冻结阶段上方土体受冻胀影响最大;开挖阶段,距开挖面中轴线距离越近,地表沉降量越大,而融沉阶段却相反;地表及管线位移的监测结果表明该工法安全可靠。
Relying on Nanjing Metro Line 10 Dream Street Station entrance and air duct reinforcement project, the program comparison and selection and in view of the project hydrogeology and the upper cross-sensitive structure of the special conditions, put forward a new method - the whole section Grouting + top of the pipe shed + rectangular horizontal freezing reinforcement. By measuring the temperature, surface and pipeline displacement of soil, the distribution of temperature field and the law of surface displacement are obtained. The results show that the ratio of the lateral and lateral development of the rectangular frozen wall is about 1.54. During the same freezing energy and freezing time, the frozen wall develops in the silt layer of silt sand silt and silt silty clay The ratio of the velocity is about 1.72; the settlement of the ground surface on both sides of the tunnel is large during the construction period of the frozen hole, while the soil above the freezing stage is most affected by the frost heave. In the excavation stage, the closer the distance to the central axis of the excavation surface, The greater the amount, while the melting stage is the opposite; surface and pipeline displacement monitoring results show that the method is safe and reliable.