丹平路猫公坝隧道上穿供水隧道的风险控制

深圳市丹平快速路—猫公坝隧道近距离上穿越布吉供水隧道、东部引水隧道,三条隧道交叉叠置,对既有隧道结构影响较大。该文论述了猫公坝隧道修建过程中对既有隧道的影响和工程安全性;提出了既有隧道的工程安全控制指标。建议在地质条件容许的情况下,应进行机械开挖。若必须采用爆破施工,应严格控制既有隧道结构的振动。对既有隧道结构、新建隧道与既有隧道之间中夹岩体提出了加固措施。拟定出施工过程中既有隧道的监控量测方案,根据监测数据反馈围岩与支护的状态以指导施工,并为可能出现的安全问题提供了预案。实践证明,对布吉供水隧道的加固设计是必要的和成功的。

Risk Control of Danping Expressway Maogongba Tunnel Overpassing Water Supply Tunnel

Maogongba Tunnel of Shenzhen City Danping Expressway overpasses Buji Water Supply Tunnel and the East Water Diversion Tunnel in the close distance.Three tunnels are intersected and folded,which affect greatly on the existing tunnel structures.The article discusses the influence of Maogongba Tunnel on the existing tunnels under the construction and the engineering safety,puts forward the engineering safety control index of the existing tunnels,and proposes the mechanical excavation under the allowed geological condition.The vibration of the existing tunnel construction must be strictly controlled if it has to take the blast construction.The reinforcement measures should be taken for the rock among the existing tunnel structure,the newly built tunnel and the existing tunnel.The monitor measuring scheme of the existing tunnel is proposed in the construction process to instruct the construction according to the monitor data to feedback the status of country rock and supporting,and to provide the planned scheme for the safety problem possibly caused.The practices prove that the reinforcement design of Buji Water Supply Tunnel is necessary and successful.