[关键词]
[摘要]
为提高压实度检测效率、保证测量精度,运用压实质量快速检测技术,在某防洪治理工程中,对某段堤防进行碾压试验,将压实质量检测技术中运用较为广泛的环刀法同普氏贯入法、核子密度仪法和谐波法等快速检测方法进行对比分析,得到各种方法同环刀法的相关关系。结果表明:随碾压次数的增加,环刀法所测压实度结果呈上升趋势,振动碾压2~3次后,基本达到本工程填筑设计压实度的要求,随碾压次数的增加土体压实度基本稳定,压实度会出现小幅波动;普氏贯入法试验结果与环刀法相差不大,其相对误差可控制在±10%以内;普氏贯入法和谐波法的压实度检测结果可与环刀法建立良好的相关关系,其线性方程的相关系数R2 均大于0.95,而核子密度仪法在试验中表现一般,所建立线性方程的相关系数R2 仅为0.37。试验结果可为压实质量的快速检测以及智能碾压技术在水利工程中的应用提供技术支撑。
[Key word]
[Abstract]
The cutting ring method was compared with the Platts penetration method, the nuclear densitometer method, and the harmonic method in Juma River flood control project in the south of Xiong'an New Area (Rongcheng section). The harmonic approach captures the equivalent acceleration signal using an acceleration sensor positioned on the rolling wheel, which is then filtered and Fourier transformed into a frequency domain signal. The test area adopts the construction technology of static rolling twice and vibration rolling six times to roll the test area. After each vibration rolling, the rolling area is sampled once, with a total of 15 sampling points. When the number of rolls increases, shift 0.5 m along the axis direction of the rolling track and draw a line at the sampling boundary to make a mark. On the same number of rolling paths, along the axis direction of the rolling trajectory, the compaction degree of the fill near a certain point was measured every 6 m using the cutting ring method, Platts penetration method, nuclear densitometer method, and harmonic method. The average relative error (EMR), standardized root mean square error ( ENRMS), determination coefficient (R2), and consistency index (IA ) were used to evaluate the differences between various methods with the cutting ring method, and a linear equation was used to establish the relationship between various methods with the cutting ring method. The results showed that with the increase in rolling times, the compaction degree by the cutting ring method showed an increasing trend. After 2 or 3 times of vibration rolling, the compaction degree of the soil has reached the project’s specification requirements for the filling design. With the increase in rolling times, the soil compaction degree was stable, and the compaction degree would fluctuate slightly. The results of the Pratt penetration method were not much different from those of the cutting ring method, and the relative error was controlled within ±10%. The Platts penetration method and harmonic method could establish a good correlation with the cutting ring method, and the correlation coefficient R2 of the linear equation was greater than 0.95, while the nuclear densitometer method had poor performance in the test, and the correlation coefficient R2 of the linear equation was only 0.37. The results could provide technical support for the rapid detection of compaction quality and the application of intelligent rolling technology in hydraulic engineering.
[中图分类号]
[基金项目]