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为了研究季节冻土层对冻土墙温度场的影响,基于相似理论开展了季节冻土层影响下冻土墙温度场模型试验.通过水平冻结管形成季节冻土层,竖向冻结管冻结基坑侧壁土体,进行了6种度条件下季节冻土层温的温度场试验.使用无量纲非线性回归公式对试验结果进行了分析,并推导了季节冻土层作用下冻土墙的厚度扩展速度公式和交圈时间公式.结果表明,季节冻土层温度为-12℃,-3℃和无季节冻土层时冻土墙交圈时间分别为10.2,17.5和21 h,而从交圈到达到设计冻土墙厚度的时间分别为12.8,14.3和24.1 h.说明季节冻土层对减少冻土墙的交圈时间和增加交圈后冻土墙的厚度扩展速度都起到了有利作用.回归系数与季节冻土层温度之间具有明显的规律性,能够合理反应和解释试验现象.
In order to study the influence of seasonal frozen soil layer on the temperature field of frozen soil wall, a model test of frozen soil wall temperature field under the influence of seasonal frozen soil layer was carried out on the basis of similarity theory.Seasonal freezing soil layer was formed by horizontal freezing tube, The temperature field experiment of the seasonal frozen soil temperature under six kinds of degrees conditions was carried out.The test results were analyzed by the non-dimensional non-linear regression formula and the influence of the frozen soil wall The results show that the temperature of frozen soil layer is -12 ℃, and the time of frozen soil wall intercourse at -3 ℃ and no frozen soil layer is 10.2, 17.5 and 21 h, respectively. From The times of reaching the designed thickness of the frozen soil wall are 12.8, 14.3 and 24.1 h, respectively, which shows that the seasonal frozen soil layer has a favorable effect on reducing the time of the interlacing of the frozen soil wall and increasing the thickness expansion rate of the frozen soil wall after the intersecting circle Effect.Regression coefficient and seasonal frozen soil temperature between the obvious regularity, can reasonably reflect and explain the test phenomenon.