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通过对天然沉积原状土和重塑土进行不同排水距离的固结试验,研究了重塑土和原状土的EOP压缩性状,明确了两者性状不同的原因.对于天然沉积结构性土,当固结压力小于结构屈服压力时,土结构性抵抗了土体的变形趋势,蠕动变形甚微,排水路径对其主固结应变量影响不大;当土体处于临界屈服状态时,土结构性丧失,大孔隙坍塌,蠕动变形速率骤增,外加应力引起固结作用而产生的EOP变形量将由于土体较大的蠕变作用而对排水路径产生较大的依赖性,随着固结压力的增大,依赖性逐渐减弱.对于重塑土,排水路径和应力水平对EOP性状的影响规律与原状土屈服后的性状一致,但是由于其EOP压缩曲线位于原状土的下方,相同有效应力下具有较小的孔隙骨架,排水路径和应力水平对EOP性状的影响程度较原状土小.
The consolidation experiment of natural undisturbed soil and remolded soil with different drainage distances was carried out to study the EOP compressive properties of remolded soils and undisturbed soils and to clarify the reasons for their different characteristics.For natural sedimentary structured soils, When the junction pressure is lower than the yield stress of the structure, the soil structure resists the deformation trend of the soil, the creep deformation is very small and the drainage path has little effect on the main consolidation strain. When the soil is in the critical yield state, the soil structure loss , The collapse of macropores, the sudden increase of creep deformation rate and the consolidation of EAP caused by the applied stress will have greater dependence on the drainage path due to the larger creep of the soil. With the consolidation pressure The dependence of EOP properties on remolded soil, drainage path and stress level is consistent with that of undisturbed soil after yielding. However, due to its EOP compression curve under the original soil and under the same effective stress Smaller pore skeletons, drainage paths and stress levels have less effect on EOP traits than native soil.