级配砂石剪切波速与相对密度关系实验研究
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摘要
级配砂石是应用广泛的工程材料,现行的工程质量监测方法较为繁琐且存在一定安全隐患。使用自主研发的基于剪切波速测试技术的无粘性土剪切波速与相对密度联合测试系统,研究不同粗料配比的级配砂石材料的剪切波速与密实程度的关系,为其工程性质研究及施工质量监测提供发展新方法的物理基础。试验结果显示,当粗料配比较小且相对密度较小时,该关系表现为曲线;随着粗料配比的增加或者相对密度的增加,关系表现为直线型;幂函数关系可以很好的表达上述级配砂石材料的相对密度与剪切波速关系。通过对天然砂石混合料的测试及应用三轴-剪切波速系统测试原试样的试验结果验证了上述幂函数关系的合理性。
Graded sand is widely used as engineering material. The current engineering quality monitoring is relatively tedious with potential safety risk. Utilizing the latest developed apparatus for testing shear wave velocity and relative density for cohesionless soils,the influence of ratio of coarse aggregates on shear wave velocity of sand is investigated,in order to provide the physical basis for developing new methods on supervising engineering quality of graded sand and studying its engineering properties. Experimental results show that,when the ratios of coarse aggregates to relative density are small,the relationship between shear wave velocity and relative density is non-linear; when the ratio or density is higher,the relationship becomes linear; an exponential function is used to calibrate the relationship. Through triaxial test of original samples and natural sand samples,the exponential function between shear wave velocity and density ratio is proved.
Graded sand is widely used as engineering material. The current engineering quality monitoring is relatively tedious with potential safety risk. Utilizing the latest developed apparatus for testing shear wave velocity and relative density for cohesionless soils,the influence of ratio of coarse aggregates on shear wave velocity of sand is investigated,in order to provide the physical basis for developing new methods on supervising engineering quality of graded sand and studying its engineering properties. Experimental results show that,when the ratios of coarse aggregates to relative density are small,the relationship between shear wave velocity and relative density is non-linear; when the ratio or density is higher,the relationship becomes linear; an exponential function is used to calibrate the relationship. Through triaxial test of original samples and natural sand samples,the exponential function between shear wave velocity and density ratio is proved.
引文
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[6]中华人民共和国国家标准.岩土工程勘察规范(GB5002-94)[S].北京:中国建筑工业出版社,1995.
[7]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.YUAN Xiaoming,SUN Rui,SUN Jing et al.Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration,2000,20(4):133-139.(in Chinese)
[8]王永志,袁晓铭,孙锐.大型振动离心机设备设计关键技术研究[J].世界地震工程,2011,27(2):113-123.WANG Yongzhi,YUAN Xiaoming,SUN Rui.Critical techniques design for large scale centrifugal shakers[J].World Earthquake Engineering,2011,27(2):113-123.(in Chinese)
[9]Hardin B O.The nature of stress-strain behavior for soils[C]//From Volume I of Earthquake Engineering and Soil Dynamics—Proceedings of the ASCE Geotechnical Engineering Division Specialty Conference,June 19-21,1978,Pasadena,California.Sponsored by Geotechnical Engineering Division of ASCE in cooperation with:.1978(Proceeding)