岩质边坡锚索自由段长度的确定与力学特性分析
Determination of the Free Section Length of the Anchor Cable in the Rock Slope and Analysis of Its Mechanical Characteristics

针对平面滑动边坡坡面与滑动面走向存在夹角时和楔形体滑动边坡两种复杂地质模型，基于空间几何分析完善了传统岩质边坡锚索支护时处于不稳定岩土层中的长度计算公式，并依据相关规范对三维支护下锚索自由段总长度的求解公式进行了修正。利用数值分析分别建立两种破坏模式下边坡的三维地质模型，在锚索内锚固段长度不变的情况下，通过调整锚索的支护高度改变其自由段长度来研究锚索的轴力和锚固体应力等力学特性。研究表明：两种破坏模式下锚索自由段长度的求解公式形式是相同的，推导公式有效地解决了锚索在三维支护情形下自由段长度求解难的问题；锚索轴力及锚固体应力分布规律与以往的研究成果相吻合，并分别给出了两种破坏模式下锚索支护高度的相关建议。
Aiming at two complicated geological models of the plane sliding slope with an included angle between the trend of the sliding surface and the slope surface and the wedge sliding slope, the calculation formula of the length of the traditional rock slope in the unstable rock and soil layer with anchor cable support is improved based on spatial geometric analysis. And according to the relevant code, the formula for calculating the total length of free section of anchor cable under three-dimensional support is modified. Three dimensional geological models of slope with two failure modes are established by numerical analysis. The axial force and anchor stress of the anchor cable are studied by adjusting the supporting height of the anchor cable and changing the length of the free section under the condition that the length of the Inner anchorage section in the anchor cable remains unchanged. The results show that the formula forms of the free section length of anchor cable under the two failure modes are the same, which effectively solves the problem of solving the length of the free section of anchor cable in the case of three-dimensional support. And the axial force of anchor cable and the stress distribution of anchor body are consistent with the previous research results, and the relevant suggestions of anchor cable support height under two failure modes are given.