基于CPT评价振冲法提高砂土抗液化性能的效果
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摘要
砂土液化会引起地面喷水冒砂和不均匀沉降,危及建筑物的正常使用。对于有抗震要求的松散砂基,评价其抗液化性能是砂基设计的主要目的。结合埃及塞得东港集装箱码头二期水工工程砂土地基振冲处理前后的CPT结果,利用国内规范和国外液化判别方法预测其抗液化性能,验证了振冲挤密法可以显著提高CPT的锥尖阻力,用振冲挤密法来加固松散砂基,提高其抗液化性能具有较好的效果。
Soil liquefaction will cause sand boil and ununiform settlement,and affect the use of buildings.For the loose sand ground with the requirements for the seismic resistance,the evaluation on the liquefaction resistance is the main purpose of design.According to the CPT results before and after the soil improvement using vibro-compaction at Port Said East Container Terminal-Phase 2,the liquefaction resistance is calculated to predict the potential of liquefaction of sandy soils based on domestic standard method and international method.It is proved that the vibro-compaction can increase the cone penetration resistance evidently,and the preferable effects against liquefaction will be attained by vibro-compaction to improve the loose sandy soils.
Soil liquefaction will cause sand boil and ununiform settlement,and affect the use of buildings.For the loose sand ground with the requirements for the seismic resistance,the evaluation on the liquefaction resistance is the main purpose of design.According to the CPT results before and after the soil improvement using vibro-compaction at Port Said East Container Terminal-Phase 2,the liquefaction resistance is calculated to predict the potential of liquefaction of sandy soils based on domestic standard method and international method.It is proved that the vibro-compaction can increase the cone penetration resistance evidently,and the preferable effects against liquefaction will be attained by vibro-compaction to improve the loose sandy soils.
引文
[1]常士骠,张苏民.工程地质手册[M].北京:中国建筑工业出版社,2007:595-600.
[2]龚晓南.地基处理手册[M].北京:中国建筑工业出版社,2008:266-275.
[3]Youd T L,Idriss I M.Liquefaction resis tance of soils:Summary report from the 1996 NCEER and 1998 NCEER/NSF workshops on evaluation of liquefaction resistanceof soils[J].Journal of Geotechnical and GeoenvironmentalEngineering,2001(10):817-833.
[4]Robertson P K,Wride C E.Evaluating cyclic liquefactionpotential using cone penetration test[J].Canadian Geotechni-cal Journal,1998,35(3):442-459.
[5]Seed H B,Idriss I M.Simplified procedure for evaluatingsoil liquefaction potential[J].Journal of the Soil Mechanicsand Foundations Division,ASCE,1971,97(9):1 249-1 273.
[6]GB50021—2001岩土工程勘察规范[S].
[7]蔡国军,刘松玉.基于静力触探测试的国内外砂土液化判别方法[J].岩石力学与工程学报,2008,5(27):1 019-1 027.
[2]龚晓南.地基处理手册[M].北京:中国建筑工业出版社,2008:266-275.
[3]Youd T L,Idriss I M.Liquefaction resis tance of soils:Summary report from the 1996 NCEER and 1998 NCEER/NSF workshops on evaluation of liquefaction resistanceof soils[J].Journal of Geotechnical and GeoenvironmentalEngineering,2001(10):817-833.
[4]Robertson P K,Wride C E.Evaluating cyclic liquefactionpotential using cone penetration test[J].Canadian Geotechni-cal Journal,1998,35(3):442-459.
[5]Seed H B,Idriss I M.Simplified procedure for evaluatingsoil liquefaction potential[J].Journal of the Soil Mechanicsand Foundations Division,ASCE,1971,97(9):1 249-1 273.
[6]GB50021—2001岩土工程勘察规范[S].
[7]蔡国军,刘松玉.基于静力触探测试的国内外砂土液化判别方法[J].岩石力学与工程学报,2008,5(27):1 019-1 027.
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