珊瑚礁钙质沉积物液化特性及其机理研究
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摘要
针对南沙群岛永暑礁小澙湖珊瑚礁沉积物-钙质砂土的多孔隙及颗粒破碎特点,利用现场原位扁铲侧胀试验和室内动静三轴-扭剪试验手段,开展不同条件下钙质砂土的液化特性分析。试验结果表明,在7度地震烈度下浅海钙质砂土会发生液化;在波浪荷载作用下,饱和钙质砂土峰值孔压随振动次数的增加可分为抛物线型增长、线性增长、指数型增长和稳定状态等四个阶段,而每一阶段均对应有钙质砂颗粒间孔隙和内孔隙的不断调整和破碎过程;在均压固结条件下其液化机理归结为流滑破坏。
To investigate the porous and particle crushing characteristics of the coral reef debris(calcareous sand) from a small lagoon in Yongshu Reef of Nansha Islands,the in-situ dilatometer tests as well as the laboratory static & cyclic triaxial and torsional shear tests are conducted.The liquefaction characteristics of the calcareous sand are analyzed.The test results show that the calcareous sand at the shallow waters would liquefaction under seismic loading with a magnitude of seven.Under the wave actions,the inter-and intra-granular voids would experience a constant restructuring process and may results in the particle crushing.The peak pore pressure of saturated calcareous sand increases with the number of vibration cycles.The development of the pore pressure in the particles can be divided into four stages: parabolic growth,linear growth,exponential growth and stable state.Liquefaction of the saturated calcareous sand is likely to be streaming slide damage under the isotropic consolidation conditions.
To investigate the porous and particle crushing characteristics of the coral reef debris(calcareous sand) from a small lagoon in Yongshu Reef of Nansha Islands,the in-situ dilatometer tests as well as the laboratory static & cyclic triaxial and torsional shear tests are conducted.The liquefaction characteristics of the calcareous sand are analyzed.The test results show that the calcareous sand at the shallow waters would liquefaction under seismic loading with a magnitude of seven.Under the wave actions,the inter-and intra-granular voids would experience a constant restructuring process and may results in the particle crushing.The peak pore pressure of saturated calcareous sand increases with the number of vibration cycles.The development of the pore pressure in the particles can be divided into four stages: parabolic growth,linear growth,exponential growth and stable state.Liquefaction of the saturated calcareous sand is likely to be streaming slide damage under the isotropic consolidation conditions.
引文
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[4]汪稔,宋朝景,赵焕庭等.南沙群岛珊瑚礁工程地质[M].北京:科学出版社,1997
[5]Airey D.W.,Fahey M.Cyclic response of calcareous soilfrom the North-West Shelf of Australia[J].Geotechnique,1991,41(1)
[6]虞海珍.循环荷载作用下钙质砂动力特性的试验研究[D][硕士学位论文].武汉:中国科学院,1999
[7]李建国.波浪荷载作用下饱和钙质砂动力特性的试验研究[D][博士学位论文].武汉:中国科学院,2005
[8]陈国兴,刘雪珠,庄海洋.南京粉质粘土与粉砂互层土及粉细砂的抗液化性能试验研究[J].防灾减灾工程学报,2003,23(2)
[9]Khodaverdiloo H.,Homaee M.,Genuchten M.,et al.Deri-ving and validating pedotransfer functions for some calcareoussoils[J].Journal of Hydrology,2011,399(1-2)
[10]Yu K.F.,Zhao J.X.,Shi Q.,Meng Q.S.,et al.Recon-struction of storm/tsunami records over the last 4000years u-sing transported coral blocks and lagoon sediments in theSouthern South China Sea[J].Quaternary International,2009,195
[11]孟庆山,黄超强,李晓辉等.扁铲侧胀试验在浅海钙质土力学特性评价中的应用[J].岩土力学,2006,27(5)
[12]Meng qing-shan,Wang ren,Yu ke-fu,et al.Undisturbedstrata succession sampling technology and the engineering ge-ological characteristics of atoll in the Southern South ChinaSea[J].Marine Georesources and Geotechnology,2009,27
[13]熊卫兵,祁镇廷,季军.扁铲侧胀试验在地基土液化判别中的应用[J].地下工程与隧道,2003,(1)
[14]陈国民,李隽毅,汤智青.扁铲侧胀试验判别液化的研究和实践[J].上海地质,2003(1)
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