逆作法施工支护结构优化设计研究

Study on Optimal Design of Support Structure for Top-down Construction

逆作法由于其对环境影响程度小、干扰范围有限等优势,成为目前一种高效的地下空间开挖方式。文中以典型地下工程-地下管廊隧道为例,分析了逆作法的施工过程和对结构稳定性的影响,提出了围护桩间距和锚撑形式联合优化方法。该方法在节省投资的基础上,可有效控制围护结构的水平位移,为逆作法基坑优化施工提供参考依据。

The top-down method has become an efficient underground space excavation method because of its advantages such as small impact on the environment and limited interference range. Taking a typical underground project-underground pipe gallery as an example,this paper analyzes the construction process of the top-down method and its influence on the structural stability stress, and finally puts forward a joint optimization method for the pile spacing and support form of retaining piles. This method can control the horizontal displacement and provides a reference for the optimization construction of the reverse construction method.