水力发电2026，Vol.52Issue(4)：26-32,39,8.
水泥改良淤泥质土力学特性及本构模型研究
Mechanical Properties and Constitutive Model of Cement-modified Silty Soil
摘要
Abstract
To investigate the mechanical properties of cement-modified silty soil,laboratory tests are conducted to systematically study the influence of initial water content,cement content,freezing temperature,confining pressure and freeze-thaw cycles on the compressive strength of cement-modified soil.Based on the test results,the Duncan-Chang model is modified.The research results of the tunnel construction by artificial freezing method in the cross-river section of Fuzhou Metro indicate that:(a)the compressive strength of cement-modified silty soil initially increases and then decreases with the increase of water content,and peaks to 8.53 MPa when the water content is 28%;(b)the compressive strength of cement-modified silty soil is significantly improved with higher cement content,and reaches 13.05 MPa at 20%cement content,and the stress-strain curve exhibits strain-softening characteristics under high cement content;(c)lower freezing temperatures and higher confining pressures notably enhance the compressive strength,and the compressive strength reaches 8.85 MPa at-15℃and 11.05 MPa under 1.0 MPa confining pressure;(d)freeze-thaw cycles lead to strength degradation,but increasing cement content can mitigate this effect,and at 10%cement content,the strength after freeze-thaw cycles remains higher than that of non-cement group,and the influence of curing age is greater than that of freeze-thaw cycles;and(e)the modified Duncan-Chang model can effectively predict the stress-strain curves under different cement contents.The research findings can provide theoretical support for the design optimization of grouting reinforcement technology in tunnel engineering using the freezing method and soft soil foundation treatment.关键词
水泥改良土/力学特性/本构模型/人工冻结法/应力-应变曲线Key words
cement-modified soil/mechanical properties/constitutive model/artificial ground freezing/stress-strain curve分类
建筑与水利引用本文复制引用
郭福,王二辉,杨东启,张潮潮..水泥改良淤泥质土力学特性及本构模型研究[J].水力发电,2026,52(4):26-32,39,8.基金项目
国家自然科学基金资助项目(41977236) （41977236）
南昌市科技计划项目(0102-05240110) （0102-05240110）
