基于弯沉盆的半刚性基层脱空判识方法

Identification Method of Semi rigid Base Disengagement Based on Deflection Basin

摘要:

建立了基层脱空路面3维动力学模型，分析了脱空范围、脱空高度、基层开裂情况对弯沉盆的影响规律，并且比较了基层脱空和其他基层损坏的弯沉盆异常响应特征.通过相关性分析，提出采用弯沉比和面积指标作为基层脱空判定指标，并且提出了相应的判定标准.最后，根据结构层缺陷弥散假设，分析了脱空面积与土基等效模量损失之间的关系，建立了估算脱空面积的经验回归模型.

Abstract:

A 3D finite element model of a base disengaging pavement structure was built for dynamic analysis. The effects of disengaging area, gap height and base cracking on deflection basin were analyzed and characteristics of deflection basin for a base disengaging structure were compared with other base damages. According to a correlation analysis, DR4 and AREA4 were proposed as judging index for identification of base disengagement. Based on an assumption of defects dispersion, relationship between disengaging area and equivalent modulus decrease was analyzed and an empirical model in estimating disengaging area was put forward.