锚索桩的主动支护作用及桩身初始内力分析  

Analysis of active supporting effect and primary internal force in anchored anti-sliding piles

作　　者：蒋良潍[1] 黄润秋[1] 蒋忠信[2] 许强[1] 

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]铁道部第二勘察设计院,成都610031

出　　处：《岩土力学》2007年第11期2319-2324,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金"西部生态与环境"重大研究计划项目(No.90102002)资助

摘　　要：预应力锚索桩在桩身施工完毕且锚索施加了初始预应力时,因滑坡推力未及作用于桩上,初始预应力即刻对受荷段桩背的岩土体产生迎滑动方向反推的一种主动支护效应,同时使桩身产生初始内力。基于受荷段桩背岩土水平反力模数为常数的单向Winkler弹性地基梁模型,以及嵌入段桩周岩土水平反力双参数模式的Winkler弹性地基梁模型,以受荷段桩身挠曲线的有限差分式与嵌入段挠曲线的解析通解改进式在滑面处的协调条件联立,推导了锚索初始预应力所产生主动支护效果的半解析定量计算和桩身初始内力求解方法,该方法有助于建立应急抢险或施工期,锚索桩工程对滑坡稳定性及时作用的评估。In anchored anti-sliding piles engineering for landslides, when constructing of pile body completed and prestress tension loads to anchor cables were applied, sliding force did not acting on piles within a short time. In this phrase, the prestress tension loads produced a sort of active defending effect to landslide immediately, which applied a thrust force to the landslide opposite its sliding direction, and primary internal forces in piles presented. The computing of active defending force and primary internal forces is based on combining two sorts of elastic foundation beam mechanical models, including unidirectional elastic subgrade reaction in pile＇s cantilever section and biparameters elastic subgrade reaction in the embedding section. The calculating method is obtained concisely by associating finite difference method of cantilever section＇s deflection curve and analytical solution of embedding sections. It is helpful to evaluate the stability of landslide in the phrase of constructing emergent remedial works of anchored anti-sliding piles.

关 键 词：锚索桩 预应力 主动支护 初始内力 弹性地基梁 双参数法模型 有限差分 

分 类 号：TU473[建筑科学—结构工程]