脉动频率和等效剪切波速判定场地类别的一致性研究
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摘要
以昆明地区为例,对等效剪切波速和脉动卓越频率判定场地类别的一致性进行研究.虽然在很多情况下两法判定结果一致,但也经常出现明显差异.这是因为,等效剪切波速度仅考虑20 m以内的地层或小于20m的覆盖层,这就容易受计算范围内地层性质和测量方法、测量条件的影响,波速测定值,特别是对判定标准的边界状态可能降低一个档次,从而使场地土类别也降低.然而场地脉动卓越频率则是所有地层的综合反映,由它判定的场地土类别直接就是建筑场地类别.于是两种方法判定结果出现差异.但在同时考虑等效剪切波速度和覆盖层厚度后两方法对场地类别判定结果一致.据此,依据已有资料,对剪切波速和卓越频率拟合出线性关系y(Hz)=0.011 8x(m/s)-0.45.因此认为,以地脉动测量卓越频率判定场地类别是可行的.
This paper studies concordance of site sorts divided by main-frequency of pulse and by same-effects velocity of shear-wave for Kunming district.Although results of site sorts divided by two methods are same for many case,but its obvious difference is emerged also.Why is that calculate only stratum which is equal or small than 20m,and it are affected easy by stratums property and by methods and condition of survey.Thus valve of velocity,which lies in purlieus of defining standard especially,could decrease one grade,and yet grade of sites soil is decreased.However the main-frequency of pulse in the site is general response for all stratum under survey place,hence grade of soil divided by main-frequency of pulse is one of building site,consequently results difference defined by two methods are emerged.After having calculated same-velocity and thickness of covering stratum at same,two results is concordance for site sort.According subsistent data formula which is related to same-effects velocity with main-frequency is simulated,y/Hz=0.011 8x/(m·s-1)-0.45.Thereby we believe that is practical for defining grade of building site by main-frequency.
This paper studies concordance of site sorts divided by main-frequency of pulse and by same-effects velocity of shear-wave for Kunming district.Although results of site sorts divided by two methods are same for many case,but its obvious difference is emerged also.Why is that calculate only stratum which is equal or small than 20m,and it are affected easy by stratums property and by methods and condition of survey.Thus valve of velocity,which lies in purlieus of defining standard especially,could decrease one grade,and yet grade of sites soil is decreased.However the main-frequency of pulse in the site is general response for all stratum under survey place,hence grade of soil divided by main-frequency of pulse is one of building site,consequently results difference defined by two methods are emerged.After having calculated same-velocity and thickness of covering stratum at same,two results is concordance for site sort.According subsistent data formula which is related to same-effects velocity with main-frequency is simulated,y/Hz=0.011 8x/(m·s-1)-0.45.Thereby we believe that is practical for defining grade of building site by main-frequency.
引文
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[4]许建聪,简文彬,尚岳权.地脉动产生的机理和传播特性研究[J].浙江大学学报,2005,39(1):33-38.
[5]郭明珠,等.利用地脉动进行场地反应分析研究综述[J].世界地震工程,1999,15(3):14-18.
[6]陶夏新,等.工程场地条件评定中的地脉动研究[J].地震工程与工程振动,2001,21(4):18-23.
[7]李玉銮.福州盆地地脉动特征及其卓越周期分布规律研究[J].岩土工程界,2005,5(7):30-32.
[8]李正光,郑定昌.昆明市城区场地土层剪切波速及地脉动的特征[J].地震研究,2009(S1):456-460.
[2]林宗元.岩土工程试验监测手册[M].沈阳:辽宁科学技术出版社,1994.
[3]中国科学院武汉岩土力学研究所.RSM工程动测仪使用手册[Z].64-65.
[4]许建聪,简文彬,尚岳权.地脉动产生的机理和传播特性研究[J].浙江大学学报,2005,39(1):33-38.
[5]郭明珠,等.利用地脉动进行场地反应分析研究综述[J].世界地震工程,1999,15(3):14-18.
[6]陶夏新,等.工程场地条件评定中的地脉动研究[J].地震工程与工程振动,2001,21(4):18-23.
[7]李玉銮.福州盆地地脉动特征及其卓越周期分布规律研究[J].岩土工程界,2005,5(7):30-32.
[8]李正光,郑定昌.昆明市城区场地土层剪切波速及地脉动的特征[J].地震研究,2009(S1):456-460.
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