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冻土在负温下的变形性研究具有重要的理论意义和实践意义。因为冻土地基即使在负温不变的情况下,在外荷载作用下也会产生沉降变形,特别是对于“高温”塑性冻土地基,这种压缩沉降量是很可观的,常常是基础设计的控制因素。因此,作者完全同意这样一种观点,即当对建筑于多年冻土上的建筑物基础进行地基沉降预报时,必须考虑其下卧塑性冻土地基的压缩变形,特别是对大、中型建筑物。 近两年来,作者对75组225个冻土及人造冰试样进行了系统的室内无侧胀压缩试验研究,旨在为设计部门提供冻土地基在保持冻结状态下的沉降计算指标和方法。同时,作者还对冻土的弹性性质(可恢复变形)进行了初步的试验研究。
The research on the deformation of frozen soil under negative temperature has important theoretical and practical significance. Because even when the negative temperature is constant, the frozen ground will cause settlement deformation under external load. Especially for the “high temperature” plastic frozen ground, this kind of compressive settlement is very considerable, and it is often the basic design. Controlling factor. Therefore, the author fully agrees with the view that when forecasting foundation settlements for building foundations built on permafrost, the compressive deformation of the underlying plastic frozen ground must be considered, especially for large and medium-sized buildings. . In the past two years, the author conducted a systematic indoor non-bulging compression test study on 75 sets of 225 permafrost and artificial ice samples in order to provide the design department with the calculation index and method for the settlement of the frozen soil foundation in the frozen state. At the same time, the author also conducted a preliminary experimental study on the elastic properties (restorable deformation) of frozen soil.