摘要
地基承载力是工程勘察中需要经常测算的力学参数,然而以平板载荷和动力触探为主的承载力测量方法无法获得地下连续的承载力分布,瑞雷波探测技术仪器轻便、效率高、数据连续,能够很好地满足承载力评估的工程勘察需求。首先应用遗传算法,以实测瑞雷波速度反演出地层的横波速度,然后拟合横波速度与标贯击数的关系公式,通过标贯击数与承载力的既有转换关系,最终建立起横波速度与地基承载力的经验公式。将求得的经验公式代入未拟合的钻孔数据中,经检验,相对误差不超过6.5%,从而验证了本方法的准确性,可以通过瑞雷波技术快速计算地基承载力的大小。
Foundation bearing capacity is a mechanical parameter that needs to be measured frequently in the engineering survey.The detection of bearing capacity mainly based on plate loading and dynamic sounding cannot obtain continuous bearing capacity distribution in the underground.Rayleigh wave detection technique has the advantages of light instruments,high efficiency and continuous data,which are well satisfied with the survey requirements of bearing capacity evaluation.This paper adopts the genetic algorithm to invert the shear wave velocity of the formation with the measured rayleigh wave velocity,and fits the empirical formula between the shear wave velocity and the blow count of standard penetration test.Then through the conversion relationship between the blow count of standard penetration test and the bearing capacity,the empirical formula between the shear wave velocity and the bearing capacity of the foundation has been established.Substituting the obtained empirical formula into unfitting borehole data and testing that the relative error is less than 6.5%are to verify the accuracy of the method,so that the rayleigh wave technique can be used to quickly calculate the bearing capacity.
作者
陈支兴
张学强
Chen Zhixing;Zhang Xueqiang(Geological Subgrade Design and Research Department,China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan Hubei 430063,China;Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan Hubei 430074,China)
出处
《工程地球物理学报》
2019年第5期642-647,共6页
Chinese Journal of Engineering Geophysics
关键词
地基承载力
经验公式
标贯击数
横波速度
foundation bearing capacity
empirical formula
blow count of standard penetration test
shear wave velocity
