土钉支护抗拔研究

为了确定土钉与土体之间的界面粘结强度，为土钉支护设计提供依据，根据土钉与土体间剪应力一相对位移关系曲线，分析了钉土间荷载传递机理，建立了钉土间应力传递的力学模型。利用截面上的平衡条件，推导了有别于传统假设的作用在土钉上的应力分布及变形表达式，用解析方法研究土钉抗拔机理，以及抗拔试验的影响因素，并结合工程实测数据验证了本模型的合理性。

Withdrawal Resistance of Soil Nailing

In order to determinate the interface felt strength between nails and its surrouding soil so that it can provide ground for soil-nails support design, the force transferring mechanism was analyzed, based on shear stress-relative displacement curve between soil nail and soil . A mechanics model of stress transfer was built. The formulas of stress distribution and deformation along the soil nail were obtained according to equilibrium conditions of the section. The mechanisms of soil nail withdrawal resistance and the affecting factors soil nail withdrawal resistance test were studied by means of analysis method. The feasibility of the model was proved by comparison with observational engineering datum.