预应力锁定值对桩锚复合土钉支护结构的影响研究  

Study on the Effects of Prestress Force on Pile-Anchor Composite Soil Nailing Structure

作　　者：宋卫康[1,2,3] 郭院成[3] 丁文其[1,2] 

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]郑州大学土木工程学院,郑州450001

出　　处：《河南科学》2009年第6期690-693,共4页Henan Science

基　　金：河南省自然科学基金项目(0611010300)

摘　　要：运用有限元方法对某典型桩锚复合土钉支护结构进行了分析,主要考虑预应力锁定值对支护结构在后续开挖过程中所产生内力和位移的影响.研究结果表明:在开挖过程中,随着预应力锁定值的增大,桩体水平位移逐渐减小,预应力大小在基坑一定深度范围内对桩体位移影响显著,同时对地面沉降的影响也存在一个有效的范围.锚杆轴力分析结果表明,预应力锁定值越大,锚杆预应力损失越严重.锁定值较小时,锚杆轴力增加较大;当锁定值过大时,从开挖到结束锚杆轴力变化很小.A typical pile-anchor composite soil nailing structure is analyzed by finite element method（FEM） in this paper. The effect of prestress force on the displacement and internal force of the retaining structure during the excavation process is especially considered. The analysis results indicate that in the process of excavation, with the increase of the inherent stress value of anchor, the horizontal displacement of the pile decreases gradually. The value of prestress force has a great effect on the displacement of the pile in certain depth, while its effect on ground subsidence has a effective range. The analysis results of the axial force of the anchor indicate that in the process of excavation, the inherent stress value is larger, the prestress loss is greater, and the axial force of the anchor increases fast when the inherent stress value is small,whereas it changes very little when the inherent stress value is too large.

关 键 词：基坑 桩锚复合土钉 有限元 预应力 

分 类 号：TU463[建筑科学—结构工程]