平壤柳京饭店基岩变形特性现场测定

In Site Determination of Deformability of a Skyscraper's Foundation

平壤柳京饭店是一座正在建设中的摩天大楼,共105层,高323.55m。地基主要由细粒砂岩、粉砂岩及粉砂质粘板岩组成,其中前者占50%以上。现场试验采用一种经过改进的BJ-110钻孔弹模计,用它测定的模量就是真实值,不需要任何修正。测试成果表明细粒砂岩的弹性模量介于6—14GPa,粉砂岩约为21GPa,粉砂质粘板岩小于3GPa。大楼建设过程中曾进行了沉降观测,根据大楼自重及沉降值反算基础的平均变形模量为6GPa,与测量结果对照,两者比较接近。本文还提出了一种估算基础整体变形模量的近似方法。

Ryugyong Hotel in Pyongyang, DPRK, is a 105-storey skyscraper with a bight of 323.55m and its foundation mainly consists of fine-grained sandstone, siltstone and silty slate clay. The former involves about 50% of the total formation. A modified borehole jack was used to measure the Young's modulus of the base rock. Unlike Goodman Jack suggested by ISRM, BJ-110 Borehole Jack gives the true rock modulus directly without any correction. The results show that the elastic modulus of fine-grained sandstone ranges from 6-14 GPa, and those of siltstone and silty slate clay about 21GPa and less than 3GPa respectively. The settlement observation was carried out during construction. According to the total weight and the settlements observed, the average calculated modulus of the foundation is about 6GPa, approximately coincidents with the measured one. To obtain the average modulus of the foundation before construction, a method will be introduced in this paper.