土层锚杆刚度系数算法改进

锚杆刚度系数是考虑自由段变形、锚固段变形和锚杆相对土体位移而求得的复合刚度.在现有的锚杆刚度系数计算公式推导过程中,仅考虑了自由段和锚固段的变形,而并未考虑土体的变形,不能真实反映锚头的实际位移与内力的关系.基于锚杆和土体的协同变形,利用Mindlin解,推导考虑自由段变形、锚固段变形和土体变形的锚杆刚度系数计算公式,并用MATLAB软件编写计算程序进行计算;最后结合工程实例,运用Plaxis2D进行模拟,通过位移与内力求解锚杆刚度系数,将本文计算方法和规范法进行比较.结果表明本文计算方法与模拟结果更加吻合,从而证明了本文改进方法的合理性.

Improvement of calculation method for stiffness coefficient of soil anchor

The stiffness coefficient of anchor is composite stiffness obtained by considering the deformation of free section, anchorage section and relative displacement of anchor to soil. In the derivation of the existing formulas for calculating the stiffness coefficient of anchor, only the deformation of free section and the anchorage section were considered, while the deformation of soil was not taken into account. The relationship between the actual displacement of anchor head and the internal force can not be truly reflected. Based on the coordinated deformation of anchor and soil, the formulas for calculating the stiffness coefficient of anchor rod considering the deformation of free section, anchorage section and soil were derived by using Mindlin solution, and the calculated codes was compiled with the software of MATLAB. Finally, combined with an engineering example, Plaxis2D was used to simulate the stiffness coefficients of anchor. The stiffness coefficients of anchor were solved by displacement and internal force. Compared with the calculation method and the standard method in this paper. The results show that the calculation method in this paper is more consistent with the simulation results.