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为探求近代海洋沉积相软土的蠕变规律,对深圳海相沉积软土开展一维压缩蠕变试验和不同固结压力作用下的三轴固结不排水蠕变试验。试验表明,近海沉积相软土蠕变的非线性特性显著,非线性特征通过应力水平的增大而逐渐显露;由于一维压缩蠕变试验中环刀的侧限作用,试样没有发生快速蠕变破坏现象;次固结系数随着固结压力的增大会出现峰值,且峰值对应压力为先期固结压力。研究还表明,在工程中加大固结压力,加速土体的固结排水作用,可减小蠕变对建筑物带来的不利影响。
In order to explore the creep regularity of modern marine sedimentary facies soft clay, one-dimensional compressive creep test and triaxial consolidation undrained creep test under different consolidation pressures were carried out in Shenzhen marine sedimentary soft soil. The tests show that the nonlinear characteristics of creep of offshore soft clay are significant, and the non-linear features gradually emerge through the increase of stress level. Because of the side-effect of ring cutter in one-dimensional compressive creep test, the creep of the sample does not occur rapidly Damage phenomenon; secondary consolidation coefficient with the consolidation pressure will increase the peak, and the peak pressure corresponding to the pre-consolidation pressure. The study also shows that increasing the consolidation pressure in the project and accelerating the consolidation and drainage of the soil can reduce the adverse effect of creep on the building.