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测量土基密实度的传统习惯方法是环刀法和灌砂法。这些方法用手工操作,工作量大,费时,费事,人为误差大,还有现场取样会引起土壤结构的局部破坏,无法进行连续和重复测量等等缺点,越来越不能适应大规模建设的需要。为了解决这个矛盾,我们在学习国外先进测量技术的基础上利用γ射线在土壤中的后散射原理,研制ND-A型核子土基密度计,现已完成样机的试制。 ND-A型核子土基密度计是一种表面型的密度计。它的基本原理是γ射线与物质元
The traditional customary method of measuring the density of a soil foundation is the ring knife method and the sand filling method. These methods are hand-operated, heavy workload, time-consuming, laborious, human error, there are local sampling will cause local damage to the soil structure, can not be continuous and repeated measurements, etc., more and more unable to meet the needs of large-scale construction . In order to solve this contradiction, we developed ND-A nuclear-based soil-based densitometer based on the theory of backscattering of γ-ray in the soil based on the advanced foreign measurement technology. We have completed trial production of the prototype. ND-A nuclear-based nuclear densitometer is a surface type densitometer. Its basic principle is γ-ray and material element