压实度对水泥改良高液限土强度影响试验——以云罗高速公路为例

为研究水泥改良高液限土的抗剪强度随压实度的变化情况,进行了水泥掺量为2％的高液限土在不同压实度、不同围压下的三轴试验.试验结果发现：掺水泥高液限土在低压实度下,应力应变曲线呈应变硬化型,且呈鼓胀型破坏.仅在高压实度、低围压下,试验中应力应变曲线才呈应变软化型,且试样破坏时会出现较为明显剪切带.同时,从试验成果的整理中发现：随压实度增大,掺水泥高液限土抗剪强度随围压的增大而增大,但增长率逐步减小.而在同一围压下,不同压实度试样随着压实度的增长,抗剪强度不断增大,且增长率也不断增大,但为非线性增长.

Test study on the degree of compaction on the strength of cement-improved high liquid limit soil

To study the change of shear strength of cement improved high-liquid limit-soil with de- gree of compaction, a triaxial test of cement with an addition of 2% of high-liquid limit-soil was con- ducted under different degrees of compaction and cell pressures. The stress-strain curves of the ce- ment-improved high-liquid limit-soil under low compaction degree belong to stress hardening type with damaged samples in ballooning form, while the stress-strain curves of the cement-improved high-liquid limit-soil belong to strain softening type with destructed samples showing a relatively ap- parent shear zone under the test conditions of high degree of compaction and low cell pressure. The shear strength of the limit-soil increases with the degree of compaction, the growth rate of which gradually decreases. The shear strength of the limit-soil samples （mixed cement high liquid limit soil） increases with the increase of cell pressure under the same cell pressure and different degrees of compaction with the growth rate in gradual nonlinear growth.