饱和砂土的原位动强度确定方法探讨
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摘要
基于原状样、重塑样的室内剪切波速和动三轴试验,本文首先探讨了剪切波速和动强度的相关性,然后对实际地震半经验动强度确定方法进行考察.
Based on the shear wave velocity test and cyclic triaxial test of undisturbed and reconstituted specimens of sandy soils, a the correlativity between shear wave velocities and cyclic strengths of sandy soils has been first investigated in this paper. Then, the semiempirical method for determining cyclic strengths based on actual earthquake data has been examined. Finally, the following conclusions are drawn from the study:(1)The in-stiu fabric of sandy soils is an important factor of influence on cyclic strength,(2)There are well correlated relation between shear wave velocities and cyclic strengths. Shear velocity can reflect the influence of soil fabric on cyclic strength better than dry unit weight ( or density );(3)There are great differences among the curves of various sandy soils, (4)For sands,earthquake empirical curve is accordant with the lowest curve of tested sands. Meanwhile, for silty soils, there are still some problems have to be researched for practice.
Based on the shear wave velocity test and cyclic triaxial test of undisturbed and reconstituted specimens of sandy soils, a the correlativity between shear wave velocities and cyclic strengths of sandy soils has been first investigated in this paper. Then, the semiempirical method for determining cyclic strengths based on actual earthquake data has been examined. Finally, the following conclusions are drawn from the study:(1)The in-stiu fabric of sandy soils is an important factor of influence on cyclic strength,(2)There are well correlated relation between shear wave velocities and cyclic strengths. Shear velocity can reflect the influence of soil fabric on cyclic strength better than dry unit weight ( or density );(3)There are great differences among the curves of various sandy soils, (4)For sands,earthquake empirical curve is accordant with the lowest curve of tested sands. Meanwhile, for silty soils, there are still some problems have to be researched for practice.
引文
[1]赵冬、刘小生、黄锦德:小浪底、廊坊原状砂取样和动力性质试验研究,国家自然科学基金大项目《岩土与水工建筑物相互作用》1990年研究成果汇编,1991年4月.
[2]H.B.Seed和I.M.Idriss著(张在明、沈小克译):地震中地面运动和土的液化,地震出版社,1988年.
[3]石兆吉、郁寿松:土壤液化势的剪切波速判别法,国家地震局工程力学研究所报告,1991年3月.
[4]刘小生、汪闻韶:饱和原状砂取样技术和质量控制,工程勘察,1990年第3期.
[5]高福田、王振宇:用冻结法取深层不扰动原状砂技术试验研究,国家自然科学基金大项目《岩土与水工建筑物相互作用》(91年)研究成果汇编,1992年4月.
[6]H.B.Seed:Soil Liquefaction and Cyelic Mobility Evaluation for Level Ground During Earthquake,J.of the Geotechnical Div.,ASCE,Vol.105,No.GT2,1979.
[7]S.S.C.Lia and R.V.Whitman:Overburden Correction Factors for SPT in Sand,J.of the Geotechnical Engineering,ASCE,Vol.112,No3,1986.
[8]郭锡荣等:尼山水库坝基剪切波速测定和液化评价,水利水电科学研究院抗震所报告,1988年9月.
[2]H.B.Seed和I.M.Idriss著(张在明、沈小克译):地震中地面运动和土的液化,地震出版社,1988年.
[3]石兆吉、郁寿松:土壤液化势的剪切波速判别法,国家地震局工程力学研究所报告,1991年3月.
[4]刘小生、汪闻韶:饱和原状砂取样技术和质量控制,工程勘察,1990年第3期.
[5]高福田、王振宇:用冻结法取深层不扰动原状砂技术试验研究,国家自然科学基金大项目《岩土与水工建筑物相互作用》(91年)研究成果汇编,1992年4月.
[6]H.B.Seed:Soil Liquefaction and Cyelic Mobility Evaluation for Level Ground During Earthquake,J.of the Geotechnical Div.,ASCE,Vol.105,No.GT2,1979.
[7]S.S.C.Lia and R.V.Whitman:Overburden Correction Factors for SPT in Sand,J.of the Geotechnical Engineering,ASCE,Vol.112,No3,1986.
[8]郭锡荣等:尼山水库坝基剪切波速测定和液化评价,水利水电科学研究院抗震所报告,1988年9月.
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