【作者】 胡俊锋；

【导师】 骆少明；

【作者基本信息】 广东工业大学 ， 工程力学， 2008， 硕士

【摘要】 许多旧水泥混凝土路面已进入养护维修期,探讨如何在旧水泥混凝土上加铺新的路面已经成为一个非常有价值的研究课题,但路面维修仅靠路面弯沉指标作为路面结构理论计算和质量验收指标是远远不足的,不但无法真实反映路面内部结构的状态,而且分析结果也过于片面,容易出现失真的问题。本文结合当今比较成熟的有限元计算方法,分析路面内部结构响应特性,为将来养护维修路面和设计新的路面方案提供参考和依据。路面检测是路面内部真实状态的反映,是在路面理论分析上的进一步发展,但当今路面检测中可以直接引用的方法不多,对于目前比较关注的光纤应变检测技术,尚处于研究和开发阶段,技术还不成熟,且大部分技术属于国外拥有,价格也比较昂贵,不适合进行试验性研究,而对于电阻应变检测仪器,虽然价格低廉,但其稳定性能差,抗干扰能力低,也不适合应用在环境复杂的实际路面中。本文通过对国内外检测仪器的性能及适用范围的研究,在考虑环境影响因素和应用前景的基础上,决定采用JMZX-215型埋入式混凝土应变计。振弦式应变计具有良好的稳定性、抗干扰能力强、性价比高、采集数据方便和测试量为应变值累计值等特点,并通过对应变计结构上的改造,解决高温保护、腐蚀、抗压、耐用等问题.本文通过对在不同行车速度作用下的路面结构的数值计算,分析行车速度对路面结构响应的影响。分析结果表明,路面位移和应力(应变)响应不仅与它本身的固有频率有关,还与轮载的加载时间等因素有关,并且路面响应随着速度增加而减小,其中慢重车对路面影响最大。通过检测数据与计算数据的分析对比,研究路面内部结构的真实情况,并验证应变计检测方案。数据表明,路表弯沉数值符合设计要求,路面运行情况暂时较好。在重新开放交通后,路面面层稳定性比基层好,但在荷载作用下的基层应变比面层大,而且基层在重载作用下容易进入塑性.同时也证明,振弦式应变计能够有效的应用在路面检测中,为对路面进行长期监测提供一种新的检测技术。更多还原

【Abstract】 A lot of old cement concrete pavements has entered the maintenance phase, exploring how to overlay the new pavement on the old cement concrete pavements has become a very valuable research topic, however, pavement maintenance can not only depend on deflection which is for theoretical calculation and quality acceptance, because it is not only a true reflection of the state of the internal pavement structure, analysis results are also too one-sided. The article uses more mature finite element method to analyze the responses of the internal pavement structure, and provides reference and basis for the maintenance and design of pavement in future.Pavement detection is a true reflection of the state of the internal pavement and further development of theoretical analysis of the pavement, but the way for pavement detection that can be used directly are limited, the fiber-optic sensor technique is pay much attention, but it still be placed in the research and development stage, the technique is still not mature and the price is expensive, it is not suitable for study, in the resistance strain checkout equipment aspect, although its price is low, its stability is poor and its anti-interference capability is low, it is also not suitable for using in the pavement which environment is complex.The article studies sphere of application and performance of checkout equipment, and then chooses JMZX-215 submerged concrete strain gauge in the consideration of environmental factors and application prospects. Vibrational chord strain gauge has characteristics of good stability, high anti-interference capability, cost-effective, convenient data collection and testing the accumulated value of strain, and through the transformation of the strain gauge structure to solve problems of high-temperature, corrosion, compression, durability.The article analysis the impact of speed to the pavement structure basing on the numerical analysis of pavement structure under the load in different speeds. The results show that the road displacement and stress (strain) not only have something to do with its own natural frequency and loading time, but also other factors, and pavement response decreases with the increase in speed, slow heavy vehicles most seriously affect the pavement. The article studies the real conditions of internal pavement structure and proves the strain gauge detection program through comparison and analysis between testing data and calculation data. The data show that the deflection complies with design requirement and the pavement is in good running now. After the reopening of traffic, the pavement surface is more stable than the grass-roots, but the grass-roots has lager strain than pavement surface under the load, and the grass-roots can easily become plastic under the heavy load. At the same time, it also proves that the vibrational chord strain gauge can be effectively used in the pavement detection and provides a new detection technique for long-term monitoring of the pavement.更多还原