南京砂的液化与判别
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摘要
南京砂是一种以片状颗粒成分为主的粉细砂，与土动力学试验中常用的圆形颗粒标准石英砂有一定的差别．片状颗粒成分使得南京砂具有各向异性的性质，其水平向强度小于垂直向强度。因此，在同样的标贯击数下，南京砂比标准砂易于液化。在采用基于标准砂的研究结果作为液化判别标准时，可能会高估这种砂的抗液化能力。文章在总结南京砂液化研究资料的基础上，阐明了南京砂液化的特点，提出了南京砂液化的判别式．
Naming sand mainly consists of schistous grain. The mechanic properties of the sand are different from the standard sand with round quartz grains. Naming sand is anisotropic because of the schistous grain. Its horizontal strength is greater than that in vertical. And Nanjingsand is easier to be liquefied than the standard sand under same SPT number. The liquefaction resistance may be over estimated if the identifying method that derived from round grain snad is directly applied to Naming sand. The method used to identify Naming sand liquefaction is also derived in the paper.
Naming sand mainly consists of schistous grain. The mechanic properties of the sand are different from the standard sand with round quartz grains. Naming sand is anisotropic because of the schistous grain. Its horizontal strength is greater than that in vertical. And Nanjingsand is easier to be liquefied than the standard sand under same SPT number. The liquefaction resistance may be over estimated if the identifying method that derived from round grain snad is directly applied to Naming sand. The method used to identify Naming sand liquefaction is also derived in the paper.
引文
[1]刘颖,谢群斐.砂土振动液化[M].北京:地震出版社,1984
[2] GBJ11—89,建筑抗震设计规范[S].
[3]周镜.岩土工程中的几个问题[J].岩上工程学报,1999,2(1):2-8
[4] Huang Y L, etc. Evaluation of sand liquefaction potentials for pile group foundation and improvement inNanjing, Nanjing[A], NZNSEE, Proceeding of Technical conference. 5l-57.
[5]周镜等.南京砂的工程性质[A].南京长江大桥加固技术总结[C].北京:铁道出版社,1999
[6]谢定义,等.不规则动荷载承冲波对砂土液化的影响[J].岩土工程学报, 1984, 9(4)
[7] Seed H B, etc. Stabilization of potentially liquefiable sand deposits using gravel drains[Z]
[8]姚承万.片状砂各向异性的试验研究[D].北京:铁道部科学研究院,1986.
[2] GBJ11—89,建筑抗震设计规范[S].
[3]周镜.岩土工程中的几个问题[J].岩上工程学报,1999,2(1):2-8
[4] Huang Y L, etc. Evaluation of sand liquefaction potentials for pile group foundation and improvement inNanjing, Nanjing[A], NZNSEE, Proceeding of Technical conference. 5l-57.
[5]周镜等.南京砂的工程性质[A].南京长江大桥加固技术总结[C].北京:铁道出版社,1999
[6]谢定义,等.不规则动荷载承冲波对砂土液化的影响[J].岩土工程学报, 1984, 9(4)
[7] Seed H B, etc. Stabilization of potentially liquefiable sand deposits using gravel drains[Z]
[8]姚承万.片状砂各向异性的试验研究[D].北京:铁道部科学研究院,1986.
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