盾构过上浮基岩、孤石预处理对策

以深圳地铁5号线宝翻盾构区间为例,介绍盾构机顺利通过孤石和基岩区的预处理对策。根据设计地质资料,从盾构施工前加密地质补勘入手,摸清对盾构机掘进存在风险的孤石、上浮基岩等详细参数,然后根据盾构的性能及以往类似地质的经验教训,在本区间依次采取调线调坡绕过、加固处理后通过、控制盾构机参数直接通过等方法,盾构掘进过程中没有发生一起非计划停机,有效保证了工期,在5号线全线施工中起到了示范作用。

Pre-treatment of Bedrock and Boulders before Shield Boring

The pretreatment of boulders and bedrock before shield boring is discussed, with the boring of Bao＇ an Cen tral Station to Fanshen Station section on Line 5 of Shenzhen Metro as an example. The details of the boulders and bed rock that may cause risks for shield boring are obtained by means of additional geological predictions. Countermeasures such as alignment adjustment and gradient adjustment, reinforcement and shield boring parameter control are take to cope with the boulders and bedrock. In the end, successful boring is achieved and the construction schedule is guaranteed.