基于HWD的城市道路浅层缺陷探测研究

发布时间：2018-07-09 10:22

本文选题：浅层缺陷 + GPR　；参考：《郑州大学》2017年硕士论文

【摘要】：由于内外多重因素的影响,道路结构浅层缺陷大量涌现。浅层缺陷按其严重程度可分为局部不密实、松散与空洞三类。如果不及时采取措施处治,不仅会对城市道路行车特性产生不良影响,严重时甚至会危机公众安全。近十几年来,落锤式弯沉仪(FWD)与探地雷达(GPR)在道路病害检测与使用性能评价中得到了广泛使用和发展,无损检测已经成为检测道路浅层缺陷的新技术。目前对于重锤式弯沉仪(HWD)弯沉影响深度的研究涉及较少;GPR作为一个普查性的检测,受现场操作人员工程经验等因素的影响较大,这在某种程度上限制了HWD与GPR的应用和发展。针对这种现象,本文对城市道路浅层缺陷探测做了相关研究,主要研究内容与结论如下:(1)提出采用HWD与GPR相结合综合评价路面浅层缺陷,可以提高检测精度。(2)建立城市道路模型,通过对不同大小(0~25t)冲击荷载作用下的道路模型的研究,得出相应的路面弯沉沿深度的变化规律,并根据HWD的相关检测技术标准,得出不同大小HWD的冲击荷载的深度参考值。(3)建立HWD作用下的城市道路浅层缺陷模型,选择缺陷范围分别为0.6m×0.6m×0.6m、0.9m×0.9m×0.6m、1.2m×1.2m×0.6m,埋深分别为1m、2m、3m共9种模拟工况,分析不同大小的缺陷在不同埋深时路表弯沉盆数据,计算其弯沉盆斜率变化规律,提出采用弯沉盆斜率判定浅层缺陷的方法。(4)采用弯沉盆斜率法分析某市政道路的HWD实测数据,判定结果与GPR的检测结果相一致,证明该方法具有较好的适用性,具有一定的工程实用与参考价值。
[Abstract]:Due to the influence of many internal and external factors, a large number of shallow defects of road structure emerged. According to its severity, shallow defects can be divided into three types: local undense, loose and hollow. If we don't take measures to deal with it in time, it will not only have a bad effect on the driving characteristics of urban roads, but also endanger the public safety when it is serious. In recent years, FWD and GPR have been widely used and developed in road disease detection and performance evaluation. Non-destructive testing (NDT) has become a new technology for detecting shallow defects of roads. At present, the research on the depth of deflection of heavy weight deflectometer (HWD) involves less GPR as a general survey, which is greatly influenced by the engineering experience of field operators, which limits the application and development of HWD and GPR to some extent. In view of this phenomenon, this paper has made the correlation research to the urban road shallow layer flaw detection, the main research content and the conclusion are as follows: (1) proposed to use the HWD and the GPR to synthetically evaluate the pavement shallow layer defect, The detection accuracy can be improved. (2) the urban road model is established. Through the study of the road model under different impact loads of different sizes (0 ~ 25t), the variation law of the pavement deflection along the depth is obtained, and according to the HWD relevant detection technical standard, The depth reference values of impact loads of different sizes of HWD are obtained. (3) the shallow defect model of urban roads under HWD action is established. The defect range is 0.6m 脳 0.6m 脳 0.6m 脳 0.9m 脳 0.9m 脳 0.9m 脳 0.9m 脳 1.2m 脳 1.2m 脳 0.6m, respectively. In this paper, the data of surface deflection basin with different sizes of defects in different buried depths are analyzed, and the law of slope variation of curved sink basin is calculated. A method for judging shallow defects by means of deflection basin slope is put forward. (4) the HWD measured data of a municipal road are analyzed by means of bending basin slope method. The result is consistent with that of GPR. It is proved that this method has good applicability and has certain engineering practical and reference value.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U418

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