长沙理工大学路基路面综合设计水泥路面设计计算书

算的是路基为干燥状态时,因此假定路床顶距地下水位2.5m,取路基回弹模量湿度调整系数0.90。则路床顶综合回弹模量取为0900.90=81MPaE??。广西梧州绕城高速公路东段k14+000~k15+400段路基路面综合设计第10页根据E.0.2-2,水泥稳定碎石基层的弹性模量取2200MPabE?,泊松比取0.20b??。级配碎石底基层的弹性模量取1220MPaE?,泊松比取10.20??。⑵板底地基综合回弹模量:根据??221112211220MPaniiiXniihEhEEhh???????110.16mnXiihhh?????????=0.26ln0.860.26ln0.160.860.384Xh??????0.3840022081118.8MPa81XtEEEE?????????????????因此,板底地基综合回弹模量tE取为119MPa。⑶混凝土面层板弯曲刚度cD、半刚性基层板的弯曲刚度bD、路面结构总相对刚度半径gr计算:????3322310000.2646.4MNm1211210.EhD?????????????332222000.160.9MNm1211210.20bbbbEhD?????????1/31/346.40.91.211.210.890m119cbgtDDrE??????????????????3.荷载应力⑴标准轴载和极限荷载在临界荷位处产生的荷载应力计算:330.6520.940.6520.94s1.45101.45100.8900.261001.48MPa0.91146.4psgcbcrhPDD???????????????330.6520.940.6520.941.45101.45100.8900.262002.84MPa0.91146.4pmgcmbcrhPDD???????????????⑵面层荷载疲劳应力和面层最大荷载应力计算: