锚-土界面力学分析及拉拔试验研究  

Mechanical Analysis on Anchor-Soil Interfaces and Pull-Out Tests of Anchorage

作　　者：董捷 孙京华 陶春晨 DONG Jie;SUN Jinghua;TAO Chunchen(Hebei University of Architecture,Hebei Key Laboratory of Diagnosis,Reconstruction and Anti-Disaster of Civil Engineering,Zhangjiakou 075000,China)

机构地区：[1]河北建筑工程学院,河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075000

出　　处：《工业建筑》2022年第2期115-119,共5页Industrial Construction

基　　金：国家自然科学基金项目(51878242);河北省自然科学基金项目(E2020404007);河北省人才工程培养资助项目(A201901067)。

摘　　要：基于弹塑性状态下锚固体与周围土体之间的变形协调,建立围压条件下土层锚杆荷载传递机理模型,推导外荷载与锚固土层塑性半径及锚杆极限拉拔力之间的理论计算式。通过拉拔试验,分析锚固体所处应力状态、粗颗粒含量及土样含水率对土层锚杆极限拉拔力的影响。结果表明:在一定范围内改善土层锚杆所处的应力状态,有利于防止土层锚杆瞬间从土层中拔出;土样粗颗粒含量为60%时,试样较为密实,拉拔过程中土颗粒间的应力分布相对均匀,锚杆的承载力相对较大;在相同围压条件下,土层锚杆的极限拉拔力随着含水量的增加呈现出先增大后减少的趋势;试样极限拉拔力理论计算值与室内试验结果吻合较好,验证了理论模型的有效性。Based on the deformation coordination between the anchorage body and surrounding soil in the elastic-plastic state,a model for load transfer mechanism of anchor bars under the confining pressure was constructed,and the theoretical calculation formulas among external loads,the plastic radius of soil strata embedded in anchor rods and ultimate pull-out forces of anchor rods were deduced.The influence of the coarse particle content,stress state of anchorage bodies and water content of soil on the ultimate drawing forces of anchorage rods in soil strata was analyzed by pull-out tests.The results showed that to improve the stress state of soil strata where anchor rods were embedded in a certain range was beneficial to prevent anchor rods from being pulled out of the soil.When the coarse particle content of the soil was 60%,the soil was relatively denser,the stress in the soil particles was relatively more uniform during being pulled out of anchor rods,and the bearing capacity of the anchor rods was relatively higher.Under the same confining pressure,the ultimate drawing forces of anchor bolts in soil increased first and then decreased with the increase of the water content.In addition,the theoretical calculation values of ultimate drawing forces were in good agreement with the test results,the validity of the theoretical model was verified.

关 键 词：弹塑性 围压 极限拉拔力 锚-土界面 

分 类 号：TU43[建筑科学—岩土工程]