水泥胶凝砂土动力特性研究
发布时间：2018-08-03 20:20
【摘要】：通过室内动三轴试验研究了砂土与水泥胶凝砂土在不同应力条件下的动力变形特性及抗液化特性,结果表明:胶凝材料的掺入显著提高了砂土在动荷载作用下抵抗变形的能力,在较低水泥掺加量条件下,胶凝砂土中砂土的动力特性仍占据主导地位,其动力特性仍可用沈珠江提出的砂土动力黏弹性模型来模拟;胶凝砂土的动模量比砂土大3倍以上,而抗液化动剪应力则为砂土的2倍以上,但初始变形量及累计动残余变形量值均较砂土大幅降低;胶凝作用对低应力状态更为敏感,应力水平越低,胶凝作用对砂土抵抗动力变形能力的提高越显著,随着胶凝材料掺入,浅层砂土已很难发生地震液化,深层砂土的液化破坏主要为变形破坏,但破坏时也累积了较大的动孔隙水压力。
[Abstract]:The dynamic deformation and liquefaction resistance of sand and cement cemented sand under different stress conditions were studied by dynamic triaxial test in laboratory. The results showed that the ability of resisting deformation of sand under dynamic load was significantly improved by the addition of cementing material. Under the condition of low cement content, the dynamic characteristics of sand in cemented sand still occupy a dominant position, and its dynamic characteristics can still be simulated by the dynamic viscoelastic model of sand proposed by Shen Zhujiang, and the dynamic modulus of cemented sand is more than 3 times larger than that of sand. The anti-liquefaction dynamic shear stress is more than 2 times of that of sand, but the initial deformation and accumulative dynamic residual deformation are significantly lower than those of sand, the gelation is more sensitive to low stress state, and the stress level is lower. The effect of cementation on the resistance of sand to dynamic deformation is more significant. With the addition of cementing materials, the seismic liquefaction of shallow sand is difficult, and the liquefaction failure of deep sand is mainly deformation failure. However, the dynamic pore water pressure is also accumulated during the failure.
【作者单位】： 南京水利科学研究院;水文水资源与水利工程科学国家重点实验室;水利部土石坝破坏机理与防控技术重点实验室;
【基金】：国家自然科学基金重大研究计划集成项目(91215301);国家自然科学基金重点项目(51539006);国家自然科学基金青年基金项目(51309161)
【分类号】：TU435
本文编号：2162895
[Abstract]:The dynamic deformation and liquefaction resistance of sand and cement cemented sand under different stress conditions were studied by dynamic triaxial test in laboratory. The results showed that the ability of resisting deformation of sand under dynamic load was significantly improved by the addition of cementing material. Under the condition of low cement content, the dynamic characteristics of sand in cemented sand still occupy a dominant position, and its dynamic characteristics can still be simulated by the dynamic viscoelastic model of sand proposed by Shen Zhujiang, and the dynamic modulus of cemented sand is more than 3 times larger than that of sand. The anti-liquefaction dynamic shear stress is more than 2 times of that of sand, but the initial deformation and accumulative dynamic residual deformation are significantly lower than those of sand, the gelation is more sensitive to low stress state, and the stress level is lower. The effect of cementation on the resistance of sand to dynamic deformation is more significant. With the addition of cementing materials, the seismic liquefaction of shallow sand is difficult, and the liquefaction failure of deep sand is mainly deformation failure. However, the dynamic pore water pressure is also accumulated during the failure.
【作者单位】： 南京水利科学研究院;水文水资源与水利工程科学国家重点实验室;水利部土石坝破坏机理与防控技术重点实验室;
【基金】：国家自然科学基金重大研究计划集成项目(91215301);国家自然科学基金重点项目(51539006);国家自然科学基金青年基金项目(51309161)
【分类号】：TU435
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