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为了研究深厚表层黏土的冻胀特性,设计了双向冻结模式下的正交试验。试验结果表明:当冻结温度为-20℃、含水率为28%、干密度为1.74 g/cm3、顶端荷载为0.6 MPa时,土体产生最大冻胀率1.09%;各因素对冻胀率影响的主次关系为含水率大于外部荷载大于冷端温度大于干密度。对含水率和外荷载进行2组单因素冻胀试验,得到了冻胀率随含水率和外荷载变化的拟合曲线。
In order to study the frost heave characteristics of deep surface clay, an orthogonal experiment was designed in bidirectional freeze mode. The results show that when the freezing temperature is -20 ℃, the moisture content is 28%, the dry density is 1.74 g / cm3, and the top load is 0.6 MPa, the maximum frost heaving rate is 1.09% The primary and secondary relationships for the moisture content greater than the external load is greater than the cold end temperature greater than the dry density. Two sets of single factor frost heaving tests were carried out on water content and external load, and the fitting curve of the frost heave rate with the water content and the external load was obtained.