Based on the contact element without thickness and the assumpation of 3d axisymmetric problems, the weathering silty sandstone and silty clay that in rock-soil anchoring engineering at pearl river region are regarded as the researching objections, the machanical characteristics and limited pull forces of different size of expanding head bolt are simulated by the numerical methods, so as to analyse the bearing characters of expanding head bolt in different media of rock and soil. The reasearching results show that the main influence factors on the bearing force of the expanding head bolt are the diameter of expanding head and the strength of anchoring medium, and the effect of the length of expanding head bolt is not obvious. The research conclusion and the experimental results are identical with each other. And based on the research results, some suggestions are put forward for the design and construction of the expanding head bolt.%基于无厚度接触面单元与三维轴对称问题基本假设,以珠三角地区岩土锚固工程常见的中风化泥质粉砂岩与残积粉质粘土为研究对象,对不同设计参数扩大头锚杆受力特性与极限抗拔力进行数值模拟,以分析研究不同介质扩孔锚的承载性状.研究结果表明,扩孔锚扩大头直径与锚固介质强度是影响扩孔锚承载力的主要因素,扩大头长度对扩孔锚承载力的影响不明显,研究结论与模型实验结果相吻合.基于相关研究提出了若干对扩孔锚设计与施工有实际参考价值的建议.
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