∅42 mm和∅50 mm两型钻杆标贯击数对比分析与修正  

Comparison and correction of standard penetration test count of∅42 mm and∅50 mm drill pipes

作　　者：陈凯 杨秋芳 CHEN Kai;YANG Qiufang(CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《水运工程》2025年第3期80-84,共5页Port & Waterway Engineering

基　　金：国家重点研发计划项目(2023YFB2604200)。

摘　　要：针对目前使用∅50 mm钻杆进行标贯试验而未对标贯击数进行修正的问题,对同一场地的∅42 mm和∅50 mm两型钻杆标贯击数进行测试,得到两型钻杆的锤击能比和标贯击数值,通过数据对比建立∅50 mm钻杆标贯击数修正方法。以深圳港盐田港区东港一期工程为例,测得两型钻杆在不同土层中的标贯击数。对比分析结果表明,∅50 mm钻杆的总输入能量较∅42 mm钻杆高约5%;根据两型钻杆锤击能比和标贯击数比值的关系,确定使用∅50 mm钻杆时,粉质黏土和中粗砂的标贯击数修正系数分别为0.85和0.87。In view of the problem that∅50 mm drill pipe is used for standard penetration test(SPT)without correcting the SPT count,the SPT count of∅42 mm and∅50 mm drill pipes in the same site are tested,the hammer energy ratio and the SPT count of the two drill pipes are obtained,and the correction method of∅50 mm drill pipe SPT count through data comparison is established.Taking the first phase of Donggang project in Yantian port area,Shenzhen Port as an example,the SPT count of two types of drill pipe in different soil layers are measured.The results show that the total input energy of∅50 mm drill pipes is about 5%higher than that of∅42 mm drill pipe.According to the relationship between the hammer energy ratio of the two drill pipe types and the ratio of the SPT count,the correction coefficients of the SPT count of silty clay and medium coarse sand are 0.85 and 0.87 respectively when∅50 mm drill pipe is used in this site.

关 键 词：钻杆直径 锤击能比 标贯击数 修正系数 

分 类 号：U652.2[交通运输工程—港口、海岸及近海工程] TU473.11[交通运输工程—船舶与海洋工程]