静三轴试验中固化疏浚泥的力学特性研究

为正确理解固化疏浚泥的力学性质,通过对固化疏浚泥进行固结不排水静三轴压缩试验,研究了围压和固化剂掺量对固化疏浚泥的破坏形式、应力—应变关系及抗剪强度参数的影响。试验结果表明,随着固化剂掺量的增加,固化疏浚泥的应力—应变关系由应变硬化型变为应变软化型;破坏形式由塑性破坏向脆性破坏过渡,而围压对其破坏形式无影响;固化疏浚泥的强度和抗变形能力均随着围压和掺量的增加而增大,但当围压小于土体内结构体的屈服强度时,围压对抗变形能力的影响可忽略;粘聚力和内摩擦角随固化剂掺量分别呈对数型和线性规律增长。

Research on Mechanics Behavior of Solidified Dredged Soil under Static Triaxial Tests

In order to understand the mechanical properties of solidified dredged soil correctly, the effects of the confining pressure and the curing agent content on the damage forms, stress-strain relationships and the strength index have been analyzed by carrying out the consolidated undrained triaxial compressive tests. Experimental results show that the stress-strain relationship of solidified dredged soil changes from strain hardening to strain softening and the damage forms changes from the plastic failure to brittle failure with the increasing of the curing agent content but the confining pressure has no effect on the damage forms; the strength and the anti-deforming capability of the solidified dredges soil increases with the increasing of the confining pressure and the dosage, but when the confining pressure is less than the yield strength of the structure in soil body, the effect of confining pressure on the anti-deforming capability can be ignored; the law of cohesive force and angle of internal friction increasing with the curing agent content are logarithmic and linear, respectively.