The Damage Analysis And The Typical Structure Research On Cement Concrete Pavement For Shanxi Provincial Coal Route

Based on the structure damage characteristics of Shanxi heavy load cement concrete pavement on the traffic open not a long time (3to5years),it difficult to meet the needs of freight traffic conditions. Through the Survey of cement concrete pavement about Heavy damage (such as crushing, breaking, jack mud, dislocation, smoothness and polish and other diseases), and coal traffic load parameters and load spectra statistics, the paper analyzes a variety of reasons of the occurrence of heavy damage to the cement concrete pavement, summed up the success or failure of structural design and structural combination; discussed axle load spectrum of Coal Route and the cumulative axle prediction;adopted varying size of cement concrete pavement structural mechanics model to analyze the critical point of the pavement structure surface and base under the heavy load(coal vehicles), summed up the design methods of Coal Route cement concrete pavement based on the surface and base comprehensive fatigue damage as a design guidelines.Based on the used request of coal route in Shanxi,the paper proposed the typical structure of Coal Route to adapt to heavy traffic. The main findings obtained are as follows:(1) according to the survey data of structure damage condition of Shanxi heavy load cement concrete pavement,the pape analyzed variety damage reasons of the heavy load cement concrete pavement,which attributed to three aspects:overload transportation vehicles; design theory and methods not fully meet the needs of traffic demand; not grasp the key technology in construction;quality control not enough(2) Based on the investigation and axle load measurement, the paper discussed the axle-load spectrum and their statistical characteristics of Coal Route, such an large axle load (2to3times the standard axle load), high wheel pressure (1.2～1.5MPa) and the axis of the (double axle, triple axle vehicles, a high proportion), and gave cumulative axle prediction method based on axle-load spectrum.(3) Adopting the analyzing cement concrete pavement structure on the rigid and semi-rigid base-Winkler structure model of the different double-layer plane size on the ground. the paper analyzed the change of critical point of the pavement structure surface and base under the load,the affects of wide grass-roots of base and shift within the layer and the base load stress, and summed the load stress calculation formula under the various conditions(4) considering fatigue failure under the combined effects of vehicle load and temperature changes,the paper established the design methods of Coal Route cement concrete pavement based on the surface and base comprehensive fatigue damage as a design guidelines.(5) Studing the sensible structure combination of heavy cement concrete pavement, according to the the design methods of Coal Route cement concrete pavement based on the surface and base comprehensive fatigue damage as a design guidelines and the times of cumulative axle load (standard axle load or design axle load) the paper given the typical structure of rigid base (lean concrete, RCC) and the semi-rigid base (asphalt concrete) on a heavy cement concrete pavement(6) paving a test road, including ordinary concrete pavement, reinforced concrete pavement and continuously reinforced concrete pavement and tracking and ovservting the used effects of the pavement, the paper tested and verified the proposed typical structure applicability of heavy cement concrete pavementStudied result has good Systematic, it has great significance to the guidance of the structure of Shanxi cement concrete pavement design and application.