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土层锚固技术在岩土工程中已得到越来越广泛应用。简单介绍了已有土层锚固界面单元形式的研究现状,分析了土层锚固界面层的特点,提出一种新的复合界面单元,该复合界面单元由接触单元和实体单元构成,其中接触单元作为锚固体与土体之间的滑动摩擦单元,实体单元体现锚杆拉拔时对周围土体的体胀特性。利用ANSYS数值模拟软件,将新的复合单元应用于锚固体与土体之间的界面层,模拟并分析锚杆拉拔时界面层的破坏特征,得到随荷载增大时界面层剪应力分布的变化过程,并将界面层的破坏分为3个阶段,即线性阶段、滑移扩展阶段、滑移阶段。通过土层锚杆原位拉拔试验,得到土层锚杆拉拔的荷载-位移曲线,分析曲线变化特征,并对数值模拟结果进行了验证。
Soil anchoring technology has been more and more widely used in geotechnical engineering. The status quo of existing anchoring interface elements in soil is briefly introduced. The characteristics of the anchoring interface layer in soil are analyzed. A new composite interface element is proposed, which consists of contact elements and solid elements. The contact elements The sliding friction unit between the anchor and the soil body, the physical unit reflects the body bulge characteristics of the surrounding soil when the anchor rod is pulled. Using ANSYS numerical simulation software, the new composite element is applied to the interface layer between the anchor and soil, and the failure characteristics of the interface layer are simulated and analyzed. The shear stress distribution of the interface layer is obtained with the load increasing The process of change, and the destruction of the interface layer is divided into three stages, namely, linear stage, slip expansion stage, slip stage. Through the in-situ pullout test of soil anchor, the load-displacement curve of soil anchor pull-out was obtained, the curve change characteristics were analyzed, and the numerical simulation results were verified.