基于干密度指标的珊瑚砂吹填地基机场跑道沉降计算

珊瑚砂吹填地基中,只有其中细颗粒的珊瑚砂可进行常规室内压缩试验,将细颗粒珊瑚砂压缩试验成果应用到工程实践中不尽合理。通过室内大尺寸样品的压缩试验,获得珊瑚砂、珊瑚枝及珊瑚砂与珊瑚枝混合料的压力-干密度关系曲线和干密度-竖向应变关系曲线。利用关系曲线,结合现场试验得到的干密度,采用分层总和法计算珊瑚砂吹填地基需要虚铺的厚度和机场跑道总沉降量,为珊瑚砂吹填地基的沉降变形提供了一种新的计算方法。

Settlement Calculation of Runway in Coral Sand Filling Ground Based on Dry Density

Among the coral sand-filled foundations,only the fine-grained coral sand could be applied to conventional indoor compression tests.It is not reasonable to apply the fine-grained coral sand compression test results to engineering practice.In this study,the pressure-dry density relationship curve and the vertical strain-dry density relationship curve of coral sand,coral branch,as well as coral sand and coral branch mixture were obtained by the compression test of large indoor samples.Based on these curves,the stratified summation method and the dry density obtained from the field test are used to calculate the virtual paving thickness of the coral sand fill foundation and the total settlement of the airport runway,which provides a new calculation method for the settlement deformation of the coral sand dredger fill foundation.