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本文对瀑布沟冰碛土,在应力为0.5～35kg/cm~2范围内,做了σ_3=C和P=C两种应力路径的三轴试验。试验结果表明,体变从低压下的体积剪胀变为高压下的体积剪缩。根据P=C的低压试验及一个土样的固结试验结果,本文作者提出了建议的剪胀模型,并用该模型对σ_3=C、σ_1=C以及多步应力途径试验的应力—应变—体变关系进行了预测,同时给出了剑桥模型、剑桥修正模型以及成都科技大学水利系提出的简化模型的预测结果,并与实测结果进行了比较。本文认为,本建议模型能较好地预测冰碛土在这几种应力路径下的应力应变;该模型参数简单,并易于确定,同时又能考虑土的剪胀特性。因此,本文建议的模型是一个简单而又实用的模型。
In this paper, the triaxial test of σ_3=C and P=C stress paths was carried out in the area of 0.5 to 35 kg/cm~2 stress for the glaciers in the gully channel. The test results show that volume change from volumetric dilation at low pressure to volumetric shear at high pressure. According to the low pressure test of P=C and the consolidation test results of a soil sample, the authors proposed the proposed dilatancy model, and used this model for σ_3=C, σ_1=C, and the stress-strain body of the multi-step stress pathway test. The relationship between variables was forecasted, and the predicted results of the simplified model proposed by the Cambridge model, the Cambridge modified model, and the water conservancy department of Chengdu University of Science and Technology were given and compared with the measured results. This paper believes that the proposed model can predict the stress and strain of hail in these stress paths well. The parameters of the model are simple and easy to determine. At the same time, the dilatancy characteristics of soil can be considered. Therefore, the model proposed in this paper is a simple and practical model.