城市地下空间洞桩法监测指标折减及安全施工应用

Monitor Index Reduction and Safety Technology for Hole-pile-method Construction of Large Underground Space

地下工程建设具有投资大、周期长、技术复杂且随着地下空间逐步向深度大及跨度大方向发展,工程安全监控控制指标与施工工艺越来越困难。为了更好地监控施工过程可能出现的潜在隐患,结合地下空间特点及土岩混层条件,研究了地下空间施工安全监测效果,提出了暗挖施工安全监测控制指标优化方法,并据此确定了基于趋严控制指标的洞桩法施工工艺。现场监测数据结果表明,基于随机介质理论、结合土层吸收沉降特点确定的土岩混层的地下工程洞桩法施工监控指标以及施工控制工艺,可以满足施工安全控制要求。

With the construction of underground engineering with large investment,long cycle,complex technology and with the underground space gradually to the depth and span of the direction of development,engineering safety monitoring and control indicators and construction technology more and more difficult.In order to better monitor the potential hidden dangers of the construction process,combined with the characteristics of underground space and the conditions of the rock mixing layer,the effect of safety monitoring of underground space construction is studied.The optimization method of the safety monitoring and control index of dark excavation construction is proposed,and then the construction process of the hole pile method based on the strict control index is put forward.The results of on-site monitoring data show that the construction monitoring index and construction control process of underground engineering piles and construction control technology,based on the theory of random media and the characteristics of soil absorption and sedimentation,can meet the requirements of construction safety control.