Constrution Technology For Subgrade Works Of Contract No.A21 Of Qinshen Railway Line Specially For Passenger Transportation

The express railway is a concentrated reflection of modern scientific and technical achievements,and it is an important sign mark for railway modernization,it becomes a joint trend for passenger transportation development in many countries. Under the circumstance in China it has become very urgent to build the express railway lines so as to meet the needs of our reform,opening and formation of socialist market economy. The subgrade,as the foundation of the tracks will specially play an important role. Therefore in this thesis we made a detailed discreption about subgrade construction technology with the first-speed passage way-Qinshen Railway Line specially for passenger transportation as the example.First of all,a brief introduction is given for the world development history of express railway and the developing direction of future express railway. And also about the objective conditions for developing is given to the well consolidation technology with sand-packs in soft foundation treatment area and the consolidation technology with cement-mixed piles in transitional section of road and bridge areas,and the detailed introduction is also given about workmanship for filling works in subgrade body,for filling works in transitional sections of the subgrade,and for construction of base bed of the subgrade. In each part caution items in the construction and the relevant technical issues are summarized.In the last part of the thesis the key points are given with the detailed analysis and summarizing for dynamic control technology in subgrade construction,namely the calculations for the settlement in subgrade construction,including the calculation methods for the dynamic control in pre-compacting period,the burying of settlement plates,and the final settlement of the subgrade.