The article is based on the eastern section of the mainline of hu rong national road , it put forward some feasible prevention ' s technology and measures directing against different type of engineering , which is based on the investigation and analysis to types and formation ' s cause of various engineering disease of highway ' s subgrade and pavement , structure of bridge and culvert and engineering along road . it evaluate the bridge safety by ahp and forecast the character changing with time of bridge structural defect by grey system theories 本文以沪蓉国道主干线东段为依托工程，在对高等级公路路基路面工程、桥涵结构工程、公路沿线存在的各种工程病害的类型与成因进行调查与分析的基础上，针对不同类型的工程病害提出切实可行的防治技术措施，并用层次分析法评价桥梁结构的安全性和用灰色系统理论对桥梁结构存在的缺陷随时间变化的性状进行预测。
The author redesigned the common concrete beams and carried out a comparative analysis to the existing beams according to the specification for design of reinforced concrete and prestressed concrete highway bridges and culverts ( jtj023 - 85 ) , the specification for design of reinforced concrete and prestressed concrete highway bridges and culverts ( informal version for advices ) and relevant rules of its matching stipulations , light aggregate concrete bridge technology stipulations ( ( informal version for advices ) and on the basis of prestressed concrete theory . the thesis emphasized on the research of the variation of the concrete , prestressing tendon quantities , their spans , beams " height and their rigidity of both the designed beams and the existing beams , and obtained the quantitative results from above research 采用hslc置换梁体中的普通混凝土，并运用预应力混凝土理论，依据《公路钢筋混凝土及预应力混凝土桥涵设计规范》 ( jtj023 - 85 ) ， 《公路钢筋混凝土及预应力混凝土桥涵设计规范》 (征求意见稿)和与之配套编制的《轻骨料混凝土桥梁技术规程》 (征求意见稿)的有关规定，对上述普通混凝土梁进行了重新设计并与既有梁进行了对比分析，得出了设计梁与既有梁在混凝土及预应力筋用量、跨度、梁高以及刚度等方面的变化情况，得到了定量结果。
In western loess area highway construction scale mighty becoming , and because of the development of loess tunnel , the stability of roadbed , bridges and culverts , highway tunnel and sideslope is threaten seriously . find effective swift prevention and cure measures imperative , this paper combines the scientific research projects , studies the mechanics mechanism of loess tunnel calamity in highway , it is very valuable in theory and practice 在西部黄土地区公路建设规模同趋宏大，而黄土洞穴的发育使路基、桥涵、公路隧道及边坡支挡工程等的稳定性受到严重威胁，找到有效快捷的防治措施势在必行，本文结合科研项目，研究黄土洞穴公路致灾力学机理，具有一定的理论和实际意义。
The bridge is a significant part of the highway . because of the characteristics which has strict requirement , it is doomed that the technical standard of the bridge is more strict than it on the usual on the road , as overloading vehicles often go on it and unreasonable designs and construction often happen which is always resulted in the damage on the highway 桥梁是高速公路的重要组成部分，由于高速公路本身的特点，注定了其小桥涵的技术标准高于一般公路上的桥涵，但由于大量超重车辆的作用，以及设计上和施工中存在的一些不合理处，致使高速公路小桥涵出现大量病害。
The results of two methods checked well with the actual test information , which shows not only that csbcs , which is a kind of flexible underground structure , has the favorable behaviors under loading , but also that the coupled model is right and suitable , so that theoretic basis of the design and project application about csbcs are presented 两种方法计算出的结果均与现场实测数据吻合较好，既表明了波纹钢板桥涵这种柔性地下结构具有良好的受力性能，又证明了耦合模型的正确性与实用性，从而为波纹钢板桥涵的设计及工程应用提供了理论依据。
