低掺量水泥固化海泥的强度与应变特性研究

低掺量水泥固化高含水率黏土（HW-CSC）作为围海垦地填料，工程应用前景广阔。本文通过室内试验，测试不同配合比下HW-CSC试样的无侧限抗压强度，分析水泥质量分数（wc）、含水率（ww）和养护龄期（t）对HW-CSC试样强度和极限应变的影响。结果表明，HW-CSC试样强度随wc的增大而增大，随ww的增加而减小，但减小的速率逐渐变慢。ww=100%时，试样最佳wc范围为16%~18%；ww≥125%时，wc范围为12%~18%的试样强度偏低。HW-CSC试样强度随养护时间发展可分为3个阶段:14~28 d增长缓慢，28~70 d迅速增长，70 d以上保持稳定。HW-CSC极限应变随wc的增加而增大，随ww的增加而减小，随t的增加趋于集中分布。总体来看，HW-CSC极限应变分布集中于1.0%~2.5%。

Study on Strength and Strain Characteristics of Low Cement Content Solidified Sea Mud

As the filling material for reclamation，high water content clay stabilized by low cement content（HW-CSC） has a broad application prospect in engineering. In this paper，the unconfined compressive strength of HW-CSC samples with different mix proportion was tested in laboratory. Meanwhile，the influences of cement mass fraction （wc），water content （ww） and curing age （t） on the strength and ultimate strain of HW-CSC samples were analyzed. The results indicate that the strength of HW-CSC sample increases with the increase of wc，decreases with the increase of ww，however the decrease rate gradually slows down. When ww=100%，the optimum range of wc for HW-CSC sample is 16%-18%. When ww≥125%，HW-CSC sample strength is low in the range of 12%-18% of wc. According to curing age，the strength development of HW-CSC sample can be divided into three stages: slow increase from 14 d to 28 d，rapid increase from 28 d to 70 d，and keeping stable after 70 d. The ultimate strain of HW-CSC sample increases with the increase of wc，decreases with the increase of ww，and tends to be concentrated with the increase of t. The distribution of ultimate strain of HW-CSC sample is generally concentrated in the range of 1.0%-2.5%.