On A Case History Of Widening Of Highway On Soft Ground

Widening of highway on soft ground is a new challenge in the construction of highway and is a key problem that must be solved urgently at the beginning of 21th century in China. Widening of highway on soft ground may meet with the issues such as the interaction of the old and new embankments, the juncture of old and new abutment, diferential setlement and pavement cracking along the joint between the old and new embankments. Unfortunately the systematic analysis of performance and treatment techniques of widening are scarce. The interaction and diferential setlement between the old and new embankments are researched in this paper.(1) Based on the review of widening of highway, a comprehensive introduction is given to the problems of widening on the soft foundation such as the calculating methods, the soft foundation treatment design, linking measures of new and embankments, the controlling criteria about the setlement of new embankment and diferential setlement of the new and old embankments;(2) Combining with the engineering geology exploration report, general situation of Chang-Cheng highway Henglin hinge including the crack disease, natural geography and physiognomy was investigated detaily;(3) Based on the statistical analysis, the special ground soil of Chang-Cheng highway Henglin hinge was researched systematically. Compared with the classification standard in the Code of Design of Highwy Bridge and Culvert Foundation, some reseanable classification criterion was also brought forward;(4) Ground improvement method, crack treatment measure and technique of Chang-Cheng highway Henglin interaction was analyzed, and with the application of stability calculation method proposed in the Code and finite element method, the stability during the period of widening was also researched comprehensively.