摘要
采用非线性有限元分析方法,对充气锚杆的室内模型试验进行数值分析。探讨在特定充气压力(100 kPa)、埋设深度(20 cm)、土体密度(1 500 kg/m3)、橡胶膜长度(20 cm)、厚度(2 mm)等条件下充气锚杆的力学性能。在数值模型中对充气锚杆施加不同等级的拉力,并记录不同拉力时锚杆顶端的位移,绘制荷载–位移曲线,并得出不同拉力下的位移、应变云图。这些图形直接清晰地显示出拉力增加过程中,充气锚杆及砂土土体内的位移及应力变化,得到充气锚杆失效的临界状态。确定在3种不同状态时,土体的应力形式及应力分布;并给出锚杆失效时土体的破坏模式。将数值模拟所得到的荷载–位移曲线与室内模型试验所得到的荷载–位移曲线进行对比,得出两者的结果基本一致,说明模拟结果真实可靠。
Nonlinear finite element analysis method is used to carry out the numerical analysis of indoor model test of inflatable anchor. Based on the conditions of the inflation pressure（100 kPa）, buried depth（20 cm） of the anchor, the density of sand body（1 500 kg/m3）, and length（20 cm） and thickness（2 mm） of the rubber, mechanical properties of inflatable anchor are discussed. The displacement at the top of the inflatable anchors is recorded at different ranks of pulling forces, then the load-displacement curve is drawn, at last, a series of nephograms of displacement and strain have been obtained. The changes of displacement and strain of the inflatable anchor and sand body when the pull force increases are reflected directly and clearly by these charts; then the critical states of inflatable anchors losing effectiveness can be seen. Stress form and stress distribution of sand have been confirmed under three different kinds of states. Furthermore, the sand body failure mode is got when inflatable anchor lost its efficacy. Through comparing the load-displacement curves obtained by numerical simulation and indoor model test, it is shown that the comparison results are basically the same; so the numerical result is reliable.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第A01期3104-3109,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50878212)
关键词
岩土工程
非线性
有限元法
数值分析
充气锚杆
力学性能
geotechnical engineering
nonlinear
finite element method（FEM） numerical analysis
inflatableanchor： mechanical properties
