深基坑桩锚支护结构受力与稳定性研究  

Studies of Stress and Stability of Deep Excavation Supported by Anchored Pile

作　　者：白云哲 韩国强 师岩哲 BAI Yunzhe;HAN Guoqiang;SHI Yanzhe(PowerChina Hebei Electric Power Engineering Co.,Ltd.,Shijiazhuang 050031,China)

机构地区：[1]中国电建集团河北省电力勘测设计研究院有限公司,河北石家庄050031

出　　处：《电力勘测设计》2023年第S02期118-122,共5页Electric Power Survey & Design

摘　　要：深基坑桩锚支护结构的设计研究涉及到桩基技术、锚杆技术、工程施工技术和监测技术等多方面的知识。本文以某项目深基坑工程为研究对象,结合现场监测数据,分析研究在开挖过程中基坑水平位移与地表沉降的变形特性,锚索内力变化的过程,得出随开挖工况不同桩锚支护结构变形以及锚索受力的变化规律。锚索的预应力损失主要发生在锚索锁定后的短时间内,随着开挖深度的不断增加,预应力逐渐得到恢复,轴力最大值出现在第二层锚杆位置附近;施加预应力后,锚头存在着向基坑外侧的微小水平位移,随着基坑的开挖,逐渐由向基坑外侧的水平位移变为向基坑内侧的水平位移,位移量随开挖深度的增加而增加,由于预应力锚索的使用,使支护桩的水平位移和竖直位移得到有效的控制,从而更好的控制基坑的稳定性;桩墙向基坑内侧的水平位移不一定发生在桩顶,而是在基坑底面以上一定范围内。Pile-anchor support System deep foundation design research involves pile technology,bolt technology,construction technology and monitoring techniques.Taking a deep foundation pit project as the research object and combined with the field monitoring data,this article studies the deformation characteristics of horizontal shift and ground settlement and the internal force change process of anchor cable in the course of excavation,obtain the regularity conditions of different excavation pile-anchor retaining structure deformation and cable force with the foundation pit.Anchor prestress loss mainly occurred in a short time after the cable locked,the prestress gradually restored with the increasing depth of excavation and the anchor has the maximum of force near the second floor of the anchor;The anchor head have a tiny outside lateral horizontal displacement after locked,then truning into inside lateral horizontal displacement with excavation,displacement increases with the excavation.Meanwhile,the use of prestressed cable,so that to effectively control displacement of the supporting piles are horizontal and vertical,thus control stability of the foundation better;the horizontal displacement does not necessarily occur in the top of pile,but within a certain range above the excavation surface.

关 键 词：深基坑工程 桩锚支护 锚索拉力 

分 类 号：P642[天文地球—工程地质学]