花岗岩地层深基坑支护方案优化设计研究

Optimal design of deep foundation pit support scheme in granite stratum

以厦门市某地铁车站深基坑工程为研究对象,根据厦门市建筑密度高,建筑红线限制严格以及花岗岩地层分布广泛等特点,在分析原设计方案存在问题与不足的基础上,提出针对性的优化设计方案,并利用Midas XD有限元软件和修正Mohr-Coulomb模型进行数值模拟,通过内力位移计算及结构构件设计,结果表明:优化方案与原设计方案的工程造价相当,但能很好地解决建筑红线问题,有效地降低施工安全风险和工程质量风险,有利于缩短施工工期。优化设计方案可为厦门市及其他花岗岩地区类似基坑工程的设计与施工提供有益借鉴。

Based on the characteristics of Xiamen city,such as high building density,strict restriction of building red line and wide distribution of granite stratum,etc.,in terms of the analysis of the problems and shortcomings of the original design scheme,the optimized design scheme is proposed,and the numerical simulation is carried out by using Midas XD finite element software and modified Mohr-Coulomb model.Through internal force displacement calculation and structural member design,the results show that the engineering cost of the optimization scheme is equivalent to that of the original design scheme,but it can solve the problem of property line,effectively reduce the risk of construction safety and construction quality,and shorten the construction period.The optimized design scheme can provide a useful reference for the design and construction of similar foundation pit projects in Xiamen and other granite areas.