固化淤泥三轴试验研究

对不同水泥掺加量固化淤泥进行了固结不排水(CU)三轴剪切试验，对固化淤泥的破坏模式和抗剪强度参数进行了分析。试验结果表明：应力-应变曲线随着水泥量增加由理想弹塑性向应变软化型转变；当水泥量为50 kg/m3时，随固结压力的增加应力-应变曲线有理想弹塑性、应变软化和应变硬化三种类型；当水泥量高于100 kg/m3时，试样都呈脆性破坏模式。淤泥经水泥改良后成为一种结构性土，固结压力在小于试样结构屈服应力时对抗压强度影响不大。有效粘聚力随水泥量的增加呈较大的增长趋势，而有效内摩擦角分布在32o~42o，表明水泥固化淤泥的作用主要是提高土颗粒间的胶结，而填充孔隙的作用较弱。

Triaxial test of solidified dredged material

Consolidated undrained triaxial shear tests were conducted to investigate the behaviors of cement solidified dredged material (DM); the failure type and shear strength parameters were studied. Test results show that the stress-strain curves change from ideal elastoplasticity to strain softening with cement content increase. When cement content is 50 kg/m3, the stress-strain curves have three types with cell pressure increasing, namely, perfect elastoplasticity type, strain softening type and strain hardening type. When cement content is higher than 100 kg/m3, all the samples present brittle property. When DM is treated by cement, it becomes a kind of structured soil. When cell pressure is lower than sample structural strength, it has little influence on the compressive strength. The effective cohesion increases much with increase of cement content, while effective internal friction angle lies between 32 and 43 degree, indicating that the effect of cement solidification acts mainly on the bonding force among soil particles, and the filling effect is weak.