空箱减载型挡土墙在深厚填土地基中的应用

Application of Empty Box Load-reducing Retaining Wall in Deep Filled Foundation

常规箱型挡土墙多为箱型混凝土结构内填料形成重力式挡土墙,用于道路工程中;空箱型挡土墙多用于水工结构中。针对建设项目地基承载力低、空间有限的条件,设计空箱型挡土墙解决项目的工程需求,既满足了地下室覆土和挡土的需要,也满足了地基承载力要求,经济效应明显。对这一非常规结构需要选用合理的计算方法。采用常规重力式挡土墙稳定性验算方法验算挡土墙的抗滑移稳定性、抗倾覆稳定性及地基承载力,再采用有限元建模模拟结构建造及填土过程,分析复杂箱型结构最不利内力工况,进行配筋计算。计算原理清晰,结果准确,可以作为复杂挡土结构计算方法的参考。

The normal box-type retaining walls are mostly gravity retaining walls formed by filling in the box-type concrete structure,used in road engineering;while the empty box-type retaining walls are mostly used in hydraulic structures.According to the conditions of low foundation bearing capacity and limited space,the design of empty box-type retaining wall can meet the engineering requirements of the project,which not only meets the needs of basement covering and retaining soil,but also meets the requirements of foundation bearing capacity.The economic effect is obvious.A reasonable calculation method is chosen for this unconventional struc-ture.The conventional gravity retaining wall stability checking method is used to check the anti-sliding stability,anti-overturning sta-bility and foundation bearing capacity of the retaining wall,and then the finite element modeling is used to simulate the process of structure construction and filling,analyze the most unfavorable internal force condition of complex box structure,and carry out rein-forcement calculation.The calculation principle is clear and the results are accurate,which can be used as a reference for the calcula-tion method of complex retaining structure.