STUDY ON CONSTRUCTION METHOD OF LARGE CROSS SECTION TUNNEL IN SOFT SURROUNDING ROCKS
In order to solve the construction technical difficulties of large cross section tunnel in soft surrounding rocks,taking tunnel project of the expansion and renovation project which from Qingshuiyi to Zhonghe of the G30 Lianhuo highway,based on the monitoring and measurement of the surrounding convergence and crown settlement and support structure stress situation,a kind of reasonable construction method for large section tunnels in soft surrounding rocks was studied.the results show that the micro step circular excavation with reserved core soil method can ensure the safety,quality,and progress requirements of tunnel construction,and meet the needs of project construction.
large cross sectiontunnel in soft surrounding rockmonitoring and measurementconstruction method
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