考虑碎石桩排水能力复合地基中孔压长消解析解
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摘要
由于地震作用时间较短,且碎石桩渗透能力和土体渗透能力相比并不是无限大,因此本文考虑碎石桩排水能力研究了碎石桩桩体材料由地震引起的孔压的长消规律。根据比奥固结理论综合考虑碎石桩的排水能力和相应的初始条件及边界条件,推导出了能够真实反映碎石桩排水减压作用在地震期超孔隙水压力产生、扩散、消散过程中的贡献作用的一般解析解公式。同时讨论了碎石桩渗透能力的不同对抗震液化的影响作用。
Compared to the drainage capacity of soil,the drainage capacity of gravel drains is not infinite.Herein,the generation and dissipation rule of pore water pressure induced by earthquake in the gravel drains composite foundation is studied considering the drainage capacity of gravel drains.Based on the theory of Biot consolidation,a new analytic solution of excess pore water pressure during earthquake is deduced taking account of the drainage capacity,the initial and boundary condition of gravel drains,which can actually describe the contribution of gravel drains to the process of generation,diffusion and dissipation of the excess pore water pressure.Besides,the effect of drain permeability of the gravel drains on the liquefaction resistance of the foundation is discussed in accordance with the analytic solution.
Compared to the drainage capacity of soil,the drainage capacity of gravel drains is not infinite.Herein,the generation and dissipation rule of pore water pressure induced by earthquake in the gravel drains composite foundation is studied considering the drainage capacity of gravel drains.Based on the theory of Biot consolidation,a new analytic solution of excess pore water pressure during earthquake is deduced taking account of the drainage capacity,the initial and boundary condition of gravel drains,which can actually describe the contribution of gravel drains to the process of generation,diffusion and dissipation of the excess pore water pressure.Besides,the effect of drain permeability of the gravel drains on the liquefaction resistance of the foundation is discussed in accordance with the analytic solution.
引文
[1]Seed H B,Booker J R.Stabilization of potentially liquefaction sand deposits using gravel drains[J].Proc.,ASCE,1977,103(7).
[2]Yoichi Yamamoto,Masayuki Hyodo,Rolando P Orense et al.Liquefaction resistance of sandy soils under partially drained condition[J].Journal of geotechnical and geoenvironmental engineering,2009:1032-1043.
[3]Ross W Boulanger,Douglas P Stewart,et al.Drainage capacity of stone columns or gravel drains for mitigating liquefaction[J].Geotechnical Earthquake Engineering and Soil DynamicsⅢ,678-689.
[4]James K,Mitchell P E,Hon M.Mitigation of liquefaction potential of silty sands[J].ASCE,2008:433-451.
[5]徐志英.用砾石排水桩抗地震液化的砂基孔压计算[J].地震工程与工程振动,1992,12(4):88-92.
[6]杨扣红.一种砂土—碎石桩复合地基新孔压增长模式及其应用[J].Geotechical Engineering World,11(6):24-28.
[2]Yoichi Yamamoto,Masayuki Hyodo,Rolando P Orense et al.Liquefaction resistance of sandy soils under partially drained condition[J].Journal of geotechnical and geoenvironmental engineering,2009:1032-1043.
[3]Ross W Boulanger,Douglas P Stewart,et al.Drainage capacity of stone columns or gravel drains for mitigating liquefaction[J].Geotechnical Earthquake Engineering and Soil DynamicsⅢ,678-689.
[4]James K,Mitchell P E,Hon M.Mitigation of liquefaction potential of silty sands[J].ASCE,2008:433-451.
[5]徐志英.用砾石排水桩抗地震液化的砂基孔压计算[J].地震工程与工程振动,1992,12(4):88-92.
[6]杨扣红.一种砂土—碎石桩复合地基新孔压增长模式及其应用[J].Geotechical Engineering World,11(6):24-28.
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