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通过室内试验,研究一种饱和红黏土在不同升温幅值温度荷载作用下的固结效应。亦即,首先将试样在初始温度20℃和一定围压下(σ3=50,100,150,200 kPa)进行固结。然后,在不排水条件下将试样温度由20℃上升至40℃(或50℃,60℃,70℃,80℃),再让试样在该温度荷载下进行等温排水固结。试验表明,温度荷载引起的孔隙水压力最大值随升温幅值的增大而增大,达到同一温度设定值后的孔隙水压力与围压比随围压的增大而相应减小,而孔隙水压力值则增大。在温度荷载作用下,固结体应变随温度幅值的增大而增大,而随围压的增大有减小的趋势。在相同幅值温度荷载和相同围压作用下,红黏土的孔隙水压力增长速率及最大值要明显大于一种低塑性的粉质黏土,而其固结体应变却要小些。
Through laboratory experiments, the consolidation effect of a saturated red clay under different temperature loadings was investigated. That is, the sample is first consolidated at an initial temperature of 20 ° C and a confining pressure (σ3 = 50, 100, 150, 200 kPa). Then, under undrained conditions, the sample temperature is raised from 20 ° C to 40 ° C (or 50 ° C, 60 ° C, 70 ° C, 80 ° C), and the sample is isothermally drained and consolidated at this temperature. The experimental results show that the maximum pore water pressure caused by temperature load increases with the increase of temperature, and the pore water pressure and confining pressure ratio decrease with the increase of confining pressure when the temperature reaches the set value Pore water pressure increases. Under the temperature load, the strain of the consolidation increases with the increase of the temperature amplitude, but decreases with the increase of the confining pressure. Under the same temperature load and the same confining pressure, the growth rate and the maximum of pore water pressure of red clay are obviously larger than those of a low-plasticity silty clay, and the consolidation strain is smaller.