贝克曼梁弯沉车弯沉测定的影响因素分析

Effect Factor Analysis of Benkelman Beam Deflection Measuring Device on Pavement Deflection

贝克曼梁弯沉仪测定路面弯沉一直以来是我国公路工程路面弯沉检测和竣工、交工验收的标准方法,提高其测量精度对路面弯沉评价的公正性和合理性具有重要意义。弯沉车荷载以及后轴轮胎的类型、胎面花纹、层级、轮胎压力和轮胎尺寸对贝克曼梁方法测定路面弯沉均有影响,在轮胎因素中轮胎的宽度对弯沉测定结果影响最大。现场测试规程中对弯沉车的荷载等进行了规定,但是对测定车轮胎要求相对不足,分析认为需要对弯沉车的后轴轮胎也应提出要求。针对目前工程上弯沉车选择的随意性,提出了弯沉车选择的建议。

The Benkelman beam deflection method has been a standard method to test deflection of pavements for highway engineering pavement construction control and quality inspection and quality acceptance. So it is very important for the fairness and reasonableness of pavement evaluation to improve its measurement accuracy. The single axle load,tire type,tire tread pattern,tire ply,tire pressure and tire sizes all affect the measuring result,and the tire size is key factor. The requirements of deflection measuring devices in the field test methods of subgrade and pavement for highway engineering,but nothing about tires. Now it is still arbitrary to select deflection truck,so it is necessary to add the requirements of rear tires. Based on the field test and model analysis,propositional requirements of deflection measuring devices are put forward.