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该文以广州地铁某客运站折返线暗挖法施工隧道为例,研究了单排水平冻结工程温度场、冻结壁的交圈时间、冻结壁的厚度以及影响冻结效果的因素,包括冻结管数量与间距、原始地温和冻结管外壁温度。研究表明,冻结壁内任意点的温度是各冻结管共同作用的结果,冻结管数量越多,冻结效果越好,但温度主要受临近的3个冻结管影响。按盐水冷媒的通常温度冻结,冻结壁厚度难以超过3m;冻结管间距越小,冻结效果越好。按盐水冷媒的通常温度冻结,能使冻结壁交圈的冻结管间距不能超过2m;原始地温越高,冻结时间越长;冻结管外壁温度越低,冻结效果越好,冻结管外壁温度不宜高于-20℃。
Taking the tunneling of tunnel construction in a Guangzhou Metro terminal as an example, this paper studies the temperature field, the time of the freezing wall, the thickness of the frozen wall and the factors affecting the freezing effect, including the number of frozen pipes With spacing, the temperature of the outer wall of the tube is temperately frozen. The results show that the temperature at any point in the freezing wall is the result of the joint action of the freezing tubes. The more the freezing tubes, the better the freezing effect, but the temperature is mainly affected by the adjacent 3 freezing tubes. According to the normal temperature of brine water freezing, frozen wall thickness is difficult to exceed 3m; the smaller the spacing of the freezing tube, the better the freezing effect. The freezing temperature of freezing tube should not exceed 2m. The higher the original ground temperature, the longer the freezing time. The lower the temperature of the outer wall of the freezing tube, the better the freezing effect. The temperature of the outer wall of the freezing tube should not be high At -20 ° C.