基于FLAC 3D的膨胀土地层扩大头锚杆参数研究  

Study on Parameters of Expanded Head Bolt in Expansive Soil Layer Based on FLAC 3D

作　　者：覃勇 Qin Yong(Liuzhou Branch Center,Guangxi Zhuang Autonomous Region Expressway Development Center,Liuzhou,China)

机构地区：[1]广西壮族自治区高速公路发展中心柳州分中心,广西柳州

出　　处：《科学技术创新》2023年第25期216-220,共5页Scientific and Technological Innovation

摘　　要：基于典型膨胀土地层的物理和力学参数,运用FLAC 3D数值分析软件,通过改变扩大头锚杆的扩体长度、扩体直径、扩体段数3个参数,进行多组数值模拟实验,分析各参数变化对扩体锚杆极限承载力的影响。结果表明:在膨胀土地层中,扩体锚杆的极限承载力与扩体锚杆的扩体段长度和扩体直径呈正相关,但扩体直径对极限承载力的影响程度要远大于扩体段长度;随着扩体锚杆扩体段数的增加,扩体锚杆的极限承载力表现出先增后减的趋势;结合本文试验结果和工程实际,建议扩体锚杆的扩孔段数取1-2最为合理,其他参数则应按锚杆的设计锚固力合理取值。Based on the physical and mechanical parameters of typical expansive soil layer,changed the expansion length,diameter,number of expansion segments of expanded head bolt,then used FLAC 3D numerical analysis software to carry out a series of numerical simulation experiments.The results show that the ultimate bearing capacity of the expansion bolt is positively correlated with the length of the expansion section and the diameter of the expansion section,However,the influence of the diameter of the expansion section on the ultimate bearing capacity is much greater than that of the length of the expansion section.The ultimate bearing capacity increases first and then decreases with the increase of the number of expanded segments in expanded bolts.Combined with the test results and engineering practice,it is suggested that the most reasonable number of expanded segments of the expanded head bolt should be 1 to 2,and other parameters should be rationally selected according to the design anchoring force of the bolt.

关 键 词：扩大头锚杆 FLAC 3D 极限承载力 参数研究 膨胀土地层 

分 类 号：U416.14[交通运输工程—道路与铁道工程]