以西宝高速改扩建后限速调整为例,围绕改扩建高速公路的特征、道路线形、特殊道路设施与事故率等方面,着重分析了改扩建高速公路限速方案制定的依据及考虑因素,在符合相关法律法规的基础上提出适合我国改扩建高速公路限速研究和方案制定的思路及流程,为类似项目的实施提供参考.

以航天产业基地下塬路工程为设计实例,分析在地势高差较大、地质条件较为困难的建设条件下,塬边道路路线的选线原则及选线思路.介绍了大挖方段深路堑路基边坡设计要点和边坡实施阶段监测要求,并提出动态设计理念,同时介绍边坡防护原则及形式.最后,对该工程设计中注意事项做了小结,以便为类似工程设计提供参考.

挡土墙是现在工程设计中非常常见和重要的支挡防护结构之一，在建筑工程、道桥工程、矿山工程和码头工程当中应用很广。本文以应用最广泛的重力式挡土墙为例，介绍挡土墙设计中土压力和荷载计算、挡土墙抗滑、抗倾覆、防水排水等方面注意事项以及分析各种参数取值对挡土墙稳定性影响。

Aiming at the rigidity identification of bridge,based on general bridge loading test,a step-forward loading method was proposed for bridge rigidity quantitative identification.Rigidity effect factor matrix was introduced,measured deflection variation matrix and calculated deflection variation matrix were established by step-forward loading and finite element model respectively, then the deviation was controlled to get convergence to identify rigidity effect factor,and related analysis flow was illustrated.Based on a project of tie-arch bridge,the identification accuracies of single zone damage and multi-zone damage of bridge were verified.Test result shows that the accuracy of bridge identification is 6.6% except the zones near arch feet.The rigidity of concrete bridge can be located and quantitatively identified based on step-forward loading method.Using polynomial fitting to correct the measured data can improve the identification accuracy,and the convergence level increases by 18%.8 figs,20 refs.

Combined with the comparison of static load tests of post-grouting pile and conventional bored pile, the mechanism of pile-end grouting bored pile and the reliability of axial compression capacity of post-grouting pile were analyzed.The results show that the allowable bearing capacity of axial compression of single pile calculated based on prescriptive enhanced coefficient is safe and reliable.