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Numerical computation of anti-liquefaction effect of lattice-type cement-mixed soil countermeasure

Journal of Central South University 2008年第S2期15卷 155-160页

作者：高玉峰杨雪玲沈扬周源 Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Geotechnical Research Institute Hohai University East China Electric Power Design Geotechnical Engineering Company

Continuous soil-cement wall confinement method to resist liquefaction is a new kind of process. However, whether it also has a good effect on anti-liquefaction or not needs to be urgently answered for earthquake engineering. Quiet boundary is adopted on the lateral face while free field boundary is employed at the bottom. Byrne model on dynamic pore water pressure generation is accepted and natural seismic wave EI Centro whose peak acceleration is adjusted to 0.2 g in proportion is used for input. A double-layer foundation with sandy soil in the upper portion while clay soil in the lower part is chosen as the calculation model, which is 30 m in length and 20 m in width. The groundwater level is on the ground surface. Excess pore water pressure rate is considered as a liquefaction index in the three-dimensional non-linear earthquake response computation. The anti-liquefaction effectiveness and its influencing factors, such as confinement element area are studied. For the natural double-layer foundation, it is liquefied when the excess pore water pressure rate reaches 1.0 under the seismic load. Under the same earthquake load, the peak excess pore water pressure reduces to 0.56 after adopting reinforcement of the continuous soil-cement wall, which is 46% lower than before. It indicates that continuous soil-cement wall confinement method can attain the purpose of anti-liquefaction. Accordingly, it can be a sort of engineering measure to carry on the anti-liquefaction foundation treatment.

关键词： lattice-type cement-mixed soil countermeasure anti-liquefaction excess pore pressure ratio the smallest lattice area

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The Shaking Table Test on the Performance of cement-mixed Piles in Liquefiable Railway Foundations

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Earthquake Research in China 2019年第1期33卷 120-131页

作者： ZHAO Mengyi XIE Qiang CAO Xinwen ZHAO Wen Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University School of Civil Engineering Southwest Jiaotong University

cement-mixed piles,as countermeasure against liquefaction of silt and sand ground,can improve the shear strength and bearing capacity of foundation soil,meaning cement-mixed piles are capable of resisting displacement when an earthquake happens. However,investigations of cement-mixed piles by experimental methods such as the shaking table test is few and far between. It is especially true for the seismic performance of cement-mixed piles in liquefiable railway foundations in high seismic intensity regions. To this end,a cross-section of the Yuxi-Mengzi railway was selected as the prototype and studied by the shaking table test in this study. The results showed that composite foundation of cementmixed piles was not liquefied when the seismic acceleration was lower than 0. 30g. In the process of acceleration increasing from 0. 30g at 2Hz to 0. 60g at 3Hz,the upper middle silt outside slope toe was partly liquefied. The foundation soil under the shoulders and center of subgrade was far from the initial liquefaction criterion during the test. cementmixed piles can effectively reduce the embankment settlement and differential settlement. It can be concluded that, the design of cement-mixed piles can ensure the seismic performance of the subgrade,and satisfy the seismic design requirements of the YuxiMengzi railway in areas of VIII degrees seismic fortification intensity.

关键词： Liquefaction cement-mixed pile Railway Shaking table test

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