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EXPERIMENTAL STUDY ON CREEP BEHAVIOR OF MARINE CLAY IN SHENZHEN
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摘要: 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。Abstract: For the search of modern marine clay's creep rule,it was carried out one-dimensional compression creep test and triaxial undrained consolidation shear creep test on marine soft clay in Shenzhen under different consoildatation pressure.The experiment indicates that the marine clay creep's nonlinear feature is remarkable,which is revealed gradually with increase in stress;because of the confinement in the one-dimensional compression creep test,there is no fast creep damage phenomenon;a peak value occurs in the coefficient of secondary consolidation with the increase in consolidation,and the pressure corresponding to the peak value is a consolidation pressure ahead of time.The research also indicate that the consolidation pressure shall be increased as far as possible in the project,the consolidation and drainage of soil shall be accelerated,which may reduce the harm of creep to a building.
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