基于PLAXIS的注浆体与锚板协同锚固模型分析  

Analysis of Synergistic Anchoring Model of Grouting and Anchor Plate Based on PLAXIS

作　　者：何宜霖 高文达 HE Yilin;GAO Wenda(Changjiang River Scientific Research Institute,Wuhan 430014,China)

机构地区：[1]长江科学院,湖北武汉430014

出　　处：《河南科技》2024年第21期67-72,共6页Henan Science and Technology

基　　金：水利部先进实用技术示范项目“伞型锚土体快速锚固技术”(SF-202201);中央级公益性科研院所基本科研业务费(CKSF2019199/YT);青年科学基金项目(51709016)。

摘　　要：【目的】对协同锚固条件下注浆锚板拉拔模型进行有限元模拟,研究注浆体与锚板协同锚固控制前后锚板周围土体的变形、破裂面的变化以及锚固力的增长规律。【方法】采用PLAXIS有限元软件,并基于Tresca屈服准则的硬化土(HS)模型,建立不同试验条件下的锚板拉拔有限元分析模型,并对计算得到的位移云图、塑性点分布图及锚固力增长曲线等进行对比分析。【结果】对比锚板与注浆体协同锚固前后的位移云图可知,协同锚固后的锚板在拉拔过程中对土体的影响范围明显扩大;对比不同注浆体直径的试验发现随着注浆体直径的增加,锚板上方土体减少,锚固影响区域的形态逐渐由三角形发展为梯形;对比协同锚固前后的锚固力增长数据与位移云图可知,锚固力增加的同时,塑性区范围也出现扩大情况。【结论】研究结果表明,运用浆锚协同位移控制方法可提升锚板的锚固性能,为浆-锚协同锚固位移控制方法的推广应用提供了试验依据。[Purposes]Finite element simulation of the grouted anchor plate pullout model under cooperative anchoring conditions is carried out to study the deformation of the soil around the anchor plate before and after the control of cooperative anchorage between the grouting and the anchor plate,the change of the rupture surface as well as the growth law of the anchoring force.[Methods]Using PLAXIS finite element software and hardened soil(HS)model based on Tresca yield criterion,the finite element analysis model of anchor plate pullout under different test conditions was established,and comparative analyses were carried out based on the computed displacement cloud,plasticity point distribution map and anchoring force growth curve.[Findings]Comparing the displacement cloud diagrams before and after the cooperative anchoring of the anchor plate and the grouting,it can be seen that the scope of influence on the soil body of the anchor plate after cooperative anchoring in the pulling process is obviously enlarged;comparing the tests with different diameters of the grouting,it is found that with the increase of the diameter of the grouting,the soil above the anchor plate decreases,and the morphology of the area of influence of the anchoring gradually develops from a triangular shape to a trapezoidal shape;comparing the data of the growth of the anchoring force before and after the cooperative anchoring with the displacement cloud diagrams,the increase in the anchor force is accompanied by an expansion of the range of the plastic zone;comparing the anchoring force growth data and displacement cloud diagrams before and after synergistic anchoring,the anchoring force increases while the plastic zone range also appears to be enlarged.[Conclusions]The research results show that the use of slurry-anchor cooperative displacement control method can improve the anchoring performance of the anchor plate,which provides a test basis for the popularization and application of the slurry-anchor cooperative anchoring displacement control me

关 键 词：锚板 PLAXIS 注浆体 浆-锚协同 拉拔试验 

分 类 号：U416.1[交通运输工程—道路与铁道工程]