盾构下穿新建铁路站场地基预处理技术研究

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Abstract Research purposes: A interval tunnel of subway is adouble － track tunnel，and it has to under － pass the Shanghai － Nanjing Railway． The shield construction will cause the deformation of the rail surface of the railway to impact the running speed and safety of the train，and also the railway transportation will influence the tunnel safety． For solving these problems mentioned above，this paper presents the" pile + plate" pretreatment approach of the foundation for providing the reference to the similar works．

Research conclusions:The studies show that using the " pile + plate" pretreatment approach along with the reinforced segment for this subway tunnel can effectively control the ground deformation． In the course of construction，the synchronous grouting is a key element． And its grouting volume should be more than usual by 0． 1 － 0． 2 m 3 and the second grouting should be conducted timely to guarantee safety of the ground buildings．

Key words： shield tunnel newly － built railway foundation treatment under － passing

Received: 13 February 2012

PACS:

U455． 4

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I6/104

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