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通过研究,提出了一种基于场地超孔隙水压比的碎石桩复合地基抗液化判别方法。该方法以现行《建筑抗震设计规范》(GB 50011-2010)为基础,较为全面地揭示了设计基本地震加速度、液化判别标准贯入锤击数基准值、液化指数、场地超孔隙水压比之间的内在联系,将宏观液化现象和微观液化机理较好地统一到了一起;揭示了《建筑抗震设计规范》中标准贯入法给出的场地液化指数具有统计值的特征;揭示并较好地解释了“在低烈度区,随地震烈度的增长,场地液化指数增加较快;在高烈度区,随地震烈度的增长,场地液化指数增加较慢”这一问题。该判别方法综合考虑了碎石桩复合地基的挤密和振密效应、减震效应、排水减压效应,全面反映了碎石桩复合地基的抗液化特点,得出的结果更加接近工程实际情况。在实际工程中应用该判别标准,可以使碎石桩复合地基的设计方案更加合理,可以减少地基处理工程量、缩短施工工期、节约工程投资。
Based on the research, a method of discriminating liquefaction of gravel pile composite foundation based on site excess pore water pressure ratio is proposed. Based on the current Code for Design of Seismic Design of Buildings (GB 50011-2010), this method reveals the basic seismic acceleration, liquefaction criteria, penetration index, liquefaction index, excess pore water pressure ratio The internal relations between the macro-liquefaction and micro-liquefaction mechanism to a better unity; reveals the standard code for seismic design of buildings given site liquefaction index has statistical characteristics; reveal and better Explains that in the low intensity region, the liquefaction index of the site increases rapidly with the increase of seismic intensity. In the high intensity region, the liquefaction index of the site increases slowly with the increase of seismic intensity. The discriminant method comprehensively considers the crushing, vibrating effect, damping effect and drainage decompression effect of the gravel pile composite foundation, and fully reflects the anti-liquefaction characteristics of the gravel pile composite foundation, and the result is closer to the actual situation of the project . The application of this criterion in practical engineering can make the design of gravel pile composite foundation more reasonable, reduce the amount of foundation treatment, shorten the construction period and save the project investment.