便携式落锤弯沉仪在砂砾卵石土路基检测中的应用

为了得到能够有效评价砂砾卵石土路基压实效果的指标,分析了弯沉值、回弹模量的物理意义,指出了两者之间的关系,并将其用于砂砾卵石土路基检测中;分别说明了检测路基压实度、回弹模量的3种方法,并重点介绍了手持式落锤弯沉仪的工作原理、性能参数、主要特点。通过现场试验,将便携式落锤弯沉仪(PFWD)测得的弯沉值及反算得出的回弹模量与压实度、沉降差进行对比,结果表明两者之间具有很强的线性相关性,验证了PFWD的实用性、优越性。

Application of PFWD in Subgrade Detection with Sand Gravel Soil

In order to get effective evaluation indexes for compaction effect of embankment with sand gravel soil,this paper analyzes physical meaning of deflection and modulus of resilience, points out the relations between them, and uses them in the test of embankment with sand gravel soil. Three testing methods of deflection and modulus of resilience are introduced, and principle of work, performance parameters and main features of PFWD is emphatically introduced. Through field test, the deflection, modulus of resilience and compactness, differential settlement which get from PFWD are compared,linear correlations are obtained, thus the feasibility of PFWD is verfied.