Research on advanced support technology of tunnel in weakly consolidated cobble Stratum
As an important part of traffic infrastructure,tunnel engineering is of great significance to shorten the length of line and improve traffic conditions,the quantity and quality of tunnel construction have been in the forefront of the world,but in the course of tunnel engineering development in our country,we have also encoun-tered many kinds of complex geological conditions,among which the weak cementation pebble stratum is a typical complex stratum,the formation is of complex geological origin and low diagenesis,and is mainly composed of sand and pebbles,partly with large boulders,and the pores are filled or cemented by fine grains of soil such as silt and clay,rock and soil mass has a certain cohesion,but the overall structural strength is low,which belongs to an une-ven loose rock and soil medium system.Based on the example of Dazhuang Tunnel in Xihu Highway,this paper ex-plores and studies the advanced support measures in weak-cemented cobble stratum,so as to solve the problems of easy over-excavation and difficult tunnel-forming in weak-cemented cobble stratum.
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