路基落锤弯沉与回弹弯沉数值关系与数值分析研究
发布时间：2018-12-12 05:53
【摘要】：路基弯沉在公路施工建设中,是工程检测的重要指标之一。与压实度一同成为路基施工验收必检参数。其不仅反映路基自身的强度,而且是道路结构正常工作的保证。因而,路基弯沉是决定强度状况的关键所在,是道路结构总弯沉的主体构成。有关研究表明,路面弯沉的80%以上由路基承担。因而,准确评定路基强度是公路建设中的关键一环。 本文对呼和浩特市周边在建高速重点项目路基,分别进行了BB检测与FWD检测,研究了两组数据的关系。从路基弯沉的主要影响因素着手,通过理论分析与工程检测实例,分析了压实度、含水率、土颗粒CBR对弯沉的影响状况；确定压实度、含水率、土颗粒CBR对路基弯沉的影响程度；根据工程实践的结果,对路基弯沉的影响因素进行了充分的说明。对高速项目试验段的BB检测与FWD检测结果进行了处理,建立了符合类似工程或更接近实际的转换关系式；在高速项目试验段检测结果中,对FWD数值小于BB数值进行了统计分析；对FWD数值小于BB数值的可能原因进行了说明。分析了路基弯沉与路基材料的关系、相关系数R的影响因素、不同车道弯沉数值差异性；探讨了检测结果数值变化规律。并对试验期间存在的问题进行了说明,提出了建议。对FWD数值分析分别采用了时域、频域分析方法进行了动态分析,对路基的动态特性进行了研究。通过对数值进行时域、频域描述,得出了动态荷载与动态弯沉随频率的变化特性以及路基在动态荷载作用下的响应。
[Abstract]:Subgrade deflection is one of the important indexes in highway construction. Together with compaction degree, it is necessary to check the parameters of subgrade construction acceptance. It not only reflects the strength of the roadbed itself, but also guarantees the normal work of the road structure. Therefore, the subgrade deflection is the key to determine the strength condition and the main body of the total deflection of the road structure. The research shows that more than 80% of the pavement deflection is borne by the roadbed. Therefore, accurate evaluation of subgrade strength is a key link in highway construction. In this paper, BB detection and FWD detection are carried out on the roadbed, which is under construction around Hohhot City, and the relationship between the two groups of data is studied. Based on the main influencing factors of subgrade deflection, the influence of compaction, moisture content and soil particle CBR on deflection is analyzed through theoretical analysis and engineering test. The influence degree of compaction, moisture content and soil particle CBR on subgrade deflection is determined, and the influencing factors of roadbed deflection are fully explained according to the result of engineering practice. The results of BB detection and FWD detection of high speed project test section are processed, and the conversion relationship is established, which accords with similar engineering or closer to the actual situation. In the test result of high speed project test section, the value of FWD is less than BB value, and the FWD value is less than BB value. The possible reason that the FWD value is smaller than the BB value is explained. The relationship between subgrade deflection and subgrade material, the influencing factors of correlation coefficient R, and the difference of deflection values in different lanes are analyzed, and the law of numerical variation of test results is discussed. The problems existed during the experiment are explained and some suggestions are put forward. The time domain and frequency domain analysis methods are used in the FWD numerical analysis, and the dynamic characteristics of the subgrade are studied. By describing the numerical values in time domain and frequency domain, the variation characteristics of dynamic load and dynamic deflection with frequency and the response of roadbed under dynamic load are obtained.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
本文编号：2374042
[Abstract]:Subgrade deflection is one of the important indexes in highway construction. Together with compaction degree, it is necessary to check the parameters of subgrade construction acceptance. It not only reflects the strength of the roadbed itself, but also guarantees the normal work of the road structure. Therefore, the subgrade deflection is the key to determine the strength condition and the main body of the total deflection of the road structure. The research shows that more than 80% of the pavement deflection is borne by the roadbed. Therefore, accurate evaluation of subgrade strength is a key link in highway construction. In this paper, BB detection and FWD detection are carried out on the roadbed, which is under construction around Hohhot City, and the relationship between the two groups of data is studied. Based on the main influencing factors of subgrade deflection, the influence of compaction, moisture content and soil particle CBR on deflection is analyzed through theoretical analysis and engineering test. The influence degree of compaction, moisture content and soil particle CBR on subgrade deflection is determined, and the influencing factors of roadbed deflection are fully explained according to the result of engineering practice. The results of BB detection and FWD detection of high speed project test section are processed, and the conversion relationship is established, which accords with similar engineering or closer to the actual situation. In the test result of high speed project test section, the value of FWD is less than BB value, and the FWD value is less than BB value. The possible reason that the FWD value is smaller than the BB value is explained. The relationship between subgrade deflection and subgrade material, the influencing factors of correlation coefficient R, and the difference of deflection values in different lanes are analyzed, and the law of numerical variation of test results is discussed. The problems existed during the experiment are explained and some suggestions are put forward. The time domain and frequency domain analysis methods are used in the FWD numerical analysis, and the dynamic characteristics of the subgrade are studied. By describing the numerical values in time domain and frequency domain, the variation characteristics of dynamic load and dynamic deflection with frequency and the response of roadbed under dynamic load are obtained.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
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