基于PFWD碎石土路基压实快速检测与均匀性评价方法

Compaction quality fast detection and compaction uniformity evaluation of gravel soils subgrade based on PFWD

摘要:

为了研究碎石土路基压实的快速、无损检测及压实均匀性的评价方法,提高碎石土路基的压实质量,采用水准测量和PFWD对碎石土路基的沉降差和变形模量进行了定点采集,建立了碎石土路基沉降差与变形模量Evd的关系,提出不同沉降差要求下的Evd压实检测标准;通过对典型路段压实跟踪检测,对其压实质量进行了评价;通过对碎石土路基变形模量的高密度检测,建立了路基顶面的变形模量的三维模型,定义了路基压实均匀的指标,并对其压实的均匀性和压实的薄弱区域进行了评价. 研究结果表明,根据沉降差与Evd的关系,采用PFWD无损检测可以快速、有效地评价碎石土路基的压实状态,定义的均匀度指标可以用于评价路基压实的均匀性,通过对薄弱区域的补充压实,可以提高碎石土路基压实的均匀性．

Abstract:

To research a fast and nondestructive testing method of compaction quality of gravel soil subgrade, to evaluate the uniformity of compaction and to improve the gravel soils roadbed compacted quality, differential settlement and deformation modulus were measured by adopting level measurement and PFWD on designated points of gravel soils roadbed. The relationship of differential settlement between deformation modulus Evd is established. The compaction test standards of Evd base on different request of differential settlement are put forward. The compaction quality was evaluated by compaction tracking detection, the roadbed top 3D model of deformation modulus was established by the high density detection of gravel soil subgrade deformation modulus and the roadbed compaction uniform index defined. The compaction uniformity and the weak area of compaction were evaluated. The results of the study show that, according to the relationship between the differential settlement and Evd, the PFWD nondestructive testing can quickly and effectively evaluate gravel soil subgrade compaction condition, the homogeneous degree index can be used to evaluate the roadbed compaction evenness, the gravel soil subgrade compaction uniformity can be improved by adding compaction to the weak area.