标准贯入试验测量击打能量的试验研究.pdf

訕测设计
tHE民 CIB SURVEY田SC
岩土工程?勘测标准贯入试验测量击打能量的试验研究
标准贯入试验测量
击打能量的试验硏究
万江南,刘裕华
(1.江西省电力设计院,江西南昌610093;2.电力规划设计总院,北京100120)
摘要:标准贯入试验是最常用的勘察手段之ー,具有历史悠久、操作简单、造价低廉、可参考和借鉴的经验
キ富等优点。但传统的数标贯击数的方式缺乏理论支持,且试验过程中存在因设备差异和杆长不同带来的标
准贯入击数的误差问题,通常的做法是采用测量击打能量来对锤击击数进行修正。本文在前人研究的基础
,开展标准贯入试验的击打能量测量的试验研究。具体的方法是通过实时采集钻杆在受自由落锤锤击时的
加速度信号,并对高烦波干扰进行低通潓波,并采用力量速度法将加速度物理量转化计算,实现在标准贯入
试验过程中实时监测击打能量。通过在不同密度的砂土中采用此法进行试验,得到不同密实度相对应的击
能量呈规律性的不同的结论。国内在标准贯入试验的定量化与自动化方面的研究还较少,本文的研究对推动
国内在此领域的进展有一定积极的意义。
关键词:标准黄入试验;击打能量;加速度;潓波
中图分类号:P642文献标志码:B文章编号:1671-9913(2013)06-0014-06
Experimental Study on Measurements
Hitting Energy with Standard Penetration Test
WAN Jiang-nan, LIU Yu-hua
(1. Jiangxi Electric Power Design Institute, Nanchang 610093, China
2. China Power Engineering Consulting Group Corporation, Beijing 100120, China)
Abstract: Standard Pcnetration Test(SPT)is one of in-situ tests which are extensively used in geotechnical
engineering area. It has a long history and have advantages such as intuition in measuring variable, easy for workers
in operation and for engineers to understand, small in cost, and most importantly, have a huge accumulation of
engineering data and corresponding empirical formulas. However, it is still lack of theoretical support, the differences
of test cquipments and length of drill pipe will bring error. The usual method to deal with this problem is measurin
hitting energy to correct the blow count(SPT-N value). This paper devote itself to carry out test research measuring
hitting energy during standard penetration test, based on previous studies. The specific method in this paper is using
data acquisition tools to obtain the real time acceleration signal, filtering the high frequency acceleration wave, then
converted it to hitting energy by PV method. In this way, the hitting energy monitoring during standard penetration
test could be completed. After using this modified method in varied sand site with different density, the result have
been obtain that the hitting energy present obvious regularity which could reflect the strength of soil. The research of
quantitative and automation of SPT was seldom in china, this paper is trying to promote progress in this area
Key words: SPT; hitting energy; acceleration; filtering
收稿日期:2013-08-12
作者简介:万江南(1965-),男,江西南昌人,研究生,从事电力岩土工程勘测工作。
142013年12月第6期