Application Study On High-speed Compactor In The Widening Project Of Ye-Xin Expressway

High-speed compaction is a new construction technology of geotechnical engineering in filling and compacting of highway subgrade. During the course of construction of road bank, the quality of construction can not be controlled easily because the rolling layers are overmany. This can bring large sedimentation of the pavement after construction and deficient load bearing capacity of road subgrade, and even can induce slop failure of road subgrade. Especially, in the special district (eg. the spots of subgrade filling of abutment and behind abutment) , because of the striction of construction condition, the soil of road subgrade and back filling is difficult to compact and the compactness can't satisfy the requirement. Therefore, there are various exceptional circs after the use of highways and some serious circs, such as bumping at the end of a bridge, dilapidation of road surface and so on, which affect the natural running of highways.This thesis has discussed the basic principle and construction technology of high-speed compaction combining the widening project of Ye-Xin expressway. The compaction experiment of high-speed compactor in compacting road sugrade and gravel soil is complished by the application of high-speed compactor in the widening project of Ye-Xin expressway, and the construction effect and vibration influence are analyzed when compacting the filling soil of subgrade, abutment and behind abutment in the method of high-speed compaction. By the spot test of high-speed compaction in road subgrade settling in the widening project of Ye-Xin expressway, abundant and accurate test results are obtained. The thesis has made much analysis, conclusion and summarization on the action mechanism, construction results, construction methods of high-speed compaction by analyzing and contrasting the data observed in practice. And the detection method of construction quality of high-speed compaction has been introduced in compacting filling layers. This thesis has also studied the construction technology and construction technical parameters of soil filling construction, stones filling construction, filling strengthening construction, filling behind abutment and strengthening of structures construction. The study results have important practical value on instructing construction of road subgrade.