东帝汶帝力市珊瑚砂地基的工程性质
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摘要
珊瑚砂属珊瑚礁碎屑土,是一种特殊的地质体,具有典型的疏松多孔、硬度低、易碎的特点,由于珊瑚礁仅分布在热带海域,往往位于远离大陆的礁岛,当前对珊瑚礁岩土的勘察研究较少,相关规范也尚未涉及。以实际工程为对象,对东帝汶某珊瑚砂场地的工程性质进行了一些探讨,从标准贯入试验和钻孔剪切波速试验等原位试验结果进行分析,借鉴了目前石英砂工程性质的评价方法作为对珊瑚砂工程性质判断的参考,对珊瑚砂的强度特性和地震液化特性进行了讨论。相对石英砂的一般性质而言,珊瑚砂的标贯击数较低而相应的剪切波速相对较大,珊瑚砂在地震作用下液化的可能性较大。
Coral sands,one kind of the coral clastic soil,is a special soil with the properties of porosity,weak rigidity and friable.Because coral reefs only exist in tropical skerry and far away from mainland,there are fewer researches about coral reef rock or soil and it is not mentioned in current Chinese standards.Based on real project in Timor-Leste,this paper discusses some engineering behavior of coral sands.Depended on the in-situ test results such as SPT and drilling shear wave velocity test and using the current evaluation methods for engineering properties of quartz sands for reference,the strength properties and seismic liquefaction characteristics of coral sands are discussed.Compare with the quartz sands,coral sands has a lower SPT blow count with higher shear wave velocity,and there is a high risk of liquefaction on coral sands.
Coral sands,one kind of the coral clastic soil,is a special soil with the properties of porosity,weak rigidity and friable.Because coral reefs only exist in tropical skerry and far away from mainland,there are fewer researches about coral reef rock or soil and it is not mentioned in current Chinese standards.Based on real project in Timor-Leste,this paper discusses some engineering behavior of coral sands.Depended on the in-situ test results such as SPT and drilling shear wave velocity test and using the current evaluation methods for engineering properties of quartz sands for reference,the strength properties and seismic liquefaction characteristics of coral sands are discussed.Compare with the quartz sands,coral sands has a lower SPT blow count with higher shear wave velocity,and there is a high risk of liquefaction on coral sands.
引文
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[2]许宁.浅谈珊瑚礁岩土的工程地质特性[J].岩土工程学报,1989,11(4):81-88.
[3]赵焕庭,宋朝景,卢博,等.珊瑚礁工程地质研究的内容和方法[J].工程地质学报,1997,5(1):21-27.
[4]孙宗勋,黄鼎成.珊瑚礁工程地质研究进展[J].地球科学进展,1999,14(6):577-581.
[5]刘崇权,汪稔.钙质砂物理力学性质初探[J].岩土力学,1998,19(1):32-37.
[6]United Nations Economic and Social Commission for Asia and the Pacific(ESCAP).Geology and Mineral Resources of Timor-Leste[R].New York:United Nations,2003.
[7]GB 50011—2010建筑抗震设计规范[S].
[8]汪闻韶.土工地震减灾工程中的一个重要参量—剪切波速[J].水利学报,1994(3):80-84.
[9]石兆吉,郁寿松,丰万玲.土壤液化势的剪切波速判别法[J].岩土工程学报,1993,15(1):74-80.
[10]张荣祥.剪切波速判别地震液化势的适用性研究[J].工程地质学报,1996,4(1):53-59.
[11]虞海珍,汪稔.钙质砂动强度试验研究[J].岩土力学,1999,20(4):6-11.
[12]王维铭,孙锐,等.国内外地震液化场地特征对比研究[J]:岩土力学,2010,31(12):3913-3927.
[13]常士骠,张苏民,等.工程地质手册(第四版)[M].北京:中国建筑工业出版社,2007.
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