连续配筋水泥混凝土路面开裂过程及影响因素分析

Analysis of Crack Process and Influence Factor on Continuously Reinforced Concrete Pavement

为了解CRCP路面的开裂过程及影响因素,借助有限元软件ANSYS,对CRCP路面早期及后期的开裂过程进行了分析,并讨论了地基阻力、筋材模量、温差及黏结刚度对CRCP路面开裂行为的影响。结果表明:在水泥混凝土面层铺设初期,裂缝大约在其间距为40 m时稳定;当水泥混凝土板长小于15 m时,地基摩阻力对板中混凝土的应力影响很小;筋材模量越大,筋材约束混凝土变形的能力就越强,最终水泥混凝土的开裂间距越小;温差越大,水泥混凝土路面的开裂速度也越快,但最终水泥混凝土的裂缝间距是趋于一致的;筋材与混凝土间的黏结刚度越大,水泥混凝土路面的开裂速度越快,最终的裂缝间距也越小。

In order to analyze the crack process and influence factor of continuously reinforced concrete pavement(CRCP),the finite element software of ANSYS is used to analyze the early and later crack processes of CRCP,and discusses the influence of subgrade resistance,rebar modulus,temperature difference and bonding rigidity on the crack process of CRCP.The result shows that the crack is stable when its spacing is about 40 meters in the preliminary stage of laying concrete pavement,and the subgrade resistance has little influence on the stress of concrete slab when concrete slab length is less than 15 meters.The greater the rebar modulus is,the stronger the constraint ability of rebar for concrete deformation is.Finally the crack spacing of concrete is smaller.The larger the temperature difference is,the faster the crack speed of concrete pavement is.But the terminal crack spacing of concrete tends to be consistent.The greater bonding rigidity between rebar and concrete,the faster the crack speed of concrete pavement is.The terminal crack space is also smaller.