【摘要】 桩锚支护结构主要依靠锚杆预应力承载并显著减小坑壁侧移,土钉支护主要依靠对坑壁土体的加强来减小土体侧压力并承载,将二者有机地联合起来成为一个共同承载的整体是目前基坑支护工程中常用的结构形式.在坑壁土压力及地面超载作用下,桩锚与土钉作为一个整体共同抵抗荷载和变形,但实际工程中基坑支护结构的可用空间常受到场地限制.根据桩锚和土钉联合支护结构的受力特点、施工特点及设计规范的相应要求,考虑预应力锚杆自由段长度与土钉直线破裂面间的协调关系,按照总锚固力等效原则,研究总结了受限的联合支护结构的设计计算方法,对受场地条件限制的基坑工程支护和开挖具有一定的理论指导意义.更多还原

【Abstract】 Earth pressure is carried and displacements of pit side are controlled in pile_anchor retaining structure mainly by prestressing the anchor;and in soil nailing,earth pressure is reduced and carried mainly depending on the strengthening functions of soil nailing to soil.Combining pile_anchor retaining structure and soil nailing into a whole to bear loads is often used in retaining and protection of foundation excavations now.Under the actions of earth pressure and other kinds of loads,the SNPA,as a whole,bears loads and controls deformations.But in practice,the construction space available for retaining structure is often limited.According to the construction and load carrying features of the combined retaining structure of SNPA under limitation,considering the harmonious relationship between the free length of anchor and linear failure surface of soil nailing and based on the equivalent principle of total anchoring force,the design method,which satisties the requirements of the code,is studied and summarized in this paper.What we do here may provide some guidance for retaining and excavation of foundation pit under limited ground conditions.更多还原