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为了研究移动车载引起的动水压力对沥青路面水损坏产生的影响,探究路面层内动应力变化及动水压力的长消规律,利用自主研制的耐高温动应力和动水压力传感器,对现场行车荷载引起的动应力及动水压力进行实测,获取了动水压力的实测数据;并且基于Biot固结理论,利用一种反映移动效应的车轮荷载数值模拟方法,对实测工况下路面情况进行了动态流固耦合分析,定量研究了路面层内的动水压力长消规律。发现现场实测与数值模拟结果基本一致。沥青路面在周期行车荷载作用下,路面空隙中不断产生动水压力的泵吸作用,导致沥青混合料强度下降,进而引发水损坏。该成果验证了水损坏的水力驱动机理,为水损坏研究和路面设计提供了借鉴。
In order to study the influence of hydrodynamic pressure caused by moving vehicles on the water damage of asphalt pavement and to explore the long-term elimination law of dynamic stress and dynamic pressure of pavement, the self-developed high temperature dynamic stress and hydrodynamic pressure sensors were used to analyze the influence of on- The dynamic stress and hydrodynamic pressure caused by driving load were measured and the measured data of hydrodynamic pressure were obtained. Based on the Biot consolidation theory, a numerical method of wheel load reflecting the moving effect was used to analyze the road conditions under the measured conditions The dynamic fluid-solid coupling analysis is used to quantitatively study the law of long-term elimination of hydrodynamic pressure in pavement layer. Found that the actual field measurements and numerical simulation results are basically the same. Under the action of periodic traffic load, asphalt pavement continuously produces pumping action of hydrodynamic pressure in the air gap of the pavement, resulting in the decrease of the strength of the asphalt mixture, which in turn causes water damage. The result verifies the hydraulic driving mechanism of water damage and provides reference for water damage research and pavement design.