国内外标准贯入测试影响因素研究

Influence Factors of Standard Penetration Test in China and Over the World

随着“一带一路”倡议的快速推进,越来越多的中国企业走出去参与国外基础工程建设。目前中国企业在国外基础工程建设中遇到的最大工程问题是国内外使用的技术标准不统一。以标准贯入测试(以下简称SPT)为研究对象,综合已有研究成果,对国内外SPT的适用范围、修正方法、测试设备以及标贯击数相关性进行了分析对比。结果表明:SPT用途广泛,可用来估算土的相关参数以及评估砂土液化等,但国内外确定土性参数的经验关系多有差异;对标贯击数的修正有地下水位修正、杆长修正、上覆土压力修正、能量修正,不同国家标贯击数修正方法不同;标贯测试设备方面,中美差异主要体现在落锤类型和释放方式不同,中英差异主要体现在锤垫质量不同;当标贯击数较小时,各国标贯击数之间相差不大,在实际工程中可不考虑其差异性。

With the rapid advancement of the“One Belt,One Road”strategy,more and more Chinese companies went out to participate in the construction of foreign infrastructure projects.At present,the biggest engineering problem encountered by Chinese companies in the construction of foreign infrastructures is that the technical standards used in China and over the world are not consistent.This paper took the standard penetration test as the research object,and synthesized the existing research results,then analyzed and compared the applicable scope,correction method,test equipment,and the correlation of the standard penetration test of the domestic and international standard penetration test.The results show that domestic and international standard test is widely used,can be used to estimate soil related parameters and evaluate sand liquefaction,however the empirical relationship between soil parameters is different in China and over the world.The correction of the standard number of hits has a water table correction,rod length correction,overburden pressure correction,energy correction,different national standard penetration number correction methods.When the standard number of strokes is small,the difference between the number of standard strokes in each country is small.In actual engineering,the differences between them can be ignored.