水泥膠凝砂土動(dòng)力特性研究
發(fā)布時(shí)間：2018-08-03 20:20
【摘要】：通過室內(nèi)動(dòng)三軸試驗(yàn)研究了砂土與水泥膠凝砂土在不同應(yīng)力條件下的動(dòng)力變形特性及抗液化特性,結(jié)果表明:膠凝材料的摻入顯著提高了砂土在動(dòng)荷載作用下抵抗變形的能力,在較低水泥摻加量條件下,膠凝砂土中砂土的動(dòng)力特性仍占據(jù)主導(dǎo)地位,其動(dòng)力特性仍可用沈珠江提出的砂土動(dòng)力黏彈性模型來模擬;膠凝砂土的動(dòng)模量比砂土大3倍以上,而抗液化動(dòng)剪應(yīng)力則為砂土的2倍以上,但初始變形量及累計(jì)動(dòng)殘余變形量值均較砂土大幅降低;膠凝作用對(duì)低應(yīng)力狀態(tài)更為敏感,應(yīng)力水平越低,膠凝作用對(duì)砂土抵抗動(dòng)力變形能力的提高越顯著,隨著膠凝材料摻入,淺層砂土已很難發(fā)生地震液化,深層砂土的液化破壞主要為變形破壞,但破壞時(shí)也累積了較大的動(dòng)孔隙水壓力。
[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.
【作者單位】： 南京水利科學(xué)研究院;水文水資源與水利工程科學(xué)國家重點(diǎn)實(shí)驗(yàn)室;水利部土石壩破壞機(jī)理與防控技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金重大研究計(jì)劃集成項(xiàng)目(91215301);國家自然科學(xué)基金重點(diǎn)項(xiàng)目(51539006);國家自然科學(xué)基金青年基金項(xiàng)目(51309161)
【分類號(hào)】：TU435
本文編號(hào)：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.
【作者單位】： 南京水利科學(xué)研究院;水文水資源與水利工程科學(xué)國家重點(diǎn)實(shí)驗(yàn)室;水利部土石壩破壞機(jī)理與防控技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金重大研究計(jì)劃集成項(xiàng)目(91215301);國家自然科學(xué)基金重點(diǎn)項(xiàng)目(51539006);國家自然科學(xué)基金青年基金項(xiàng)目(51309161)
【分類號(hào)】：TU435
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