桩锚结构止水帷幕的应用

Applications of Pile-anchor Retaining Structure Plus Water Resisting Curtain

支护结构选型及止水方案的确定要充分考虑可能发生的破坏形态、地质环境及周边环境的影响。结合东莞某深基坑设计实例,针对二期项目对支护结构选型的影响以及砂层对止水效果的影响,采取分区段选用角撑及桩锚支护,采用水泥土搅拌桩+桩间旋喷作为止水帷幕体系。通过降低锚索预拉力及锚索间距等方式降低了锚索力设计值,满足锚索在软弱土层的锚固要求。结果表明,该支护类型所产生的位移在可控制的位移值以内。为具有类似地质环境及周边环境的基坑设计提供借鉴。

To determine the scheme of retaining structure and water resisting,it is essential to consider carefully about the damage that may occur,the geological condition which can affect retaining capacity and the environment effect.Accordding to the designing example of retaining structure of deep excavation in Dongguan,considering the effect of phase II project and sand layer,corner bracing and pile-anchor retaining methord are used in this excavation.Cement soil mixing pile plus jet pile are used to resist water.The deformation is under controlled from the result.Through reducing the anchor cable prestress and space of cable to reduce the force of anchor cable.It is necessary for anchoring in weak soil.This supporting type which has enlightenment can be used in similar project.