岩土预应力锚固作用三维数值模拟的等效力法  

Equivalent Force Method of 3D Numerical Simulation on Prestressed Anchorage Effect of Rock and Soil

作　　者：徐祥[1] 戴自航[1,2] 

机构地区：[1]福州大学岩土工程研究所,福建福州350108 [2]卧龙岗大学土木采矿与环境工程学院

出　　处：《水利与建筑工程学报》2015年第1期20-25,55,共7页Journal of Water Resources and Architectural Engineering

基　　金：福建省自然科学基金资助项目(2011J01308)

摘　　要：预应力锚索(杆)加固岩土是一典型的岩土与结构的空间相互作用问题。为可靠模拟这种结构与岩土的相互作用,提出了与工程中预应力施加和锁定工况相符的三维数值模拟分析等效力法。在ABAQUS有限元软件平台上,首先将该方法运用在单根预应力锚索的数值模拟试验,并与等效降温法和等效应变法进行对比分析,结果表明了该方法的优越性,此外,也分析了锚固段锚索轴力衰减速率与锚固体刚度有关,且与理论认识一致。然后,将等效力法应用在一实际预应力锚索加固边坡工程三维数值模拟中,分析了预应力锚索对加固边坡内部应力分布、边坡稳定性及锚索轴力分布的影响,表明该方法能可靠地应用于分析预应力锚索加固岩土的效果及锚索自身内力。The issue of rock and soil reinforced with prestressed anchor cables （rods） is a typical spatial interaction issue between structure and rock-soil .In order to reliably simulate this kind of interaction ,an equivalent force method which agreed with the working conditions of prestress loading and locking was presented in 3D numerical analysis .On the plat-form of the finite element software ABAQUS ,firstly ,the numerical modeling test of a single prestressed anchor cable was conducted .It demonstrates the superiority of the equivalent force method compared with the existing equivalent lowering temperature method and equivalent strain method .Meanwhile , the analysis shows that the declining rates of the axial forces of the anchor cables are related with the stiffness of anchorage body and the outcomes are consistent with the theo-retical ones .Then based on a practical slope reinforcement engineering ,the application of the equivalent force method was introduced in the 3D numerical modeling of a slope reinforced with prestressed anchors .It indicates that this method can be reliably applied to analyze the reinforcement effect of rock and soil with prestressed anchors and the internal forces of anchors’ themselves .

关 键 词：预应力锚索 相互作用 等效力法 锚索轴力 边坡加固 稳定系数 

分 类 号：TU476[建筑科学—结构工程]