燕山山区竖向岩石锚杆基础的破坏形式及应变特征分析

根据现场试验，从锚杆基础破坏前后的形态、地面隆起变形测量、裂缝展开测量等分析，研究燕山区强风化花岗岩和片麻岩中竖向锚杆基础的破坏形式；通过量测锚杆基础不同荷载条件下不同深度的应变，分析强风化岩体中的锚杆基础的应变特征；通过在同一荷载条件下对不同长度锚杆基础施加竖向荷载，得出该区域范围强风化花岗岩和片麻岩中竖向锚杆的最优长度经验值。为该竖向岩石锚杆基础的应用提供实践经验。

Failure Mode and Strain Characteristics Analysis of Vertical Rock Bolt Foundation in Yanshan Area

According to site test, gneiss in Yanshan area is studied the failure mode of vertical bolt foundation in strongly weathered granite and through analyzing the form of bolt foundation before and after failure, surface upheaval and crack expansion. The strain characteristics of bolt foundation analyzed through measuring the strain in different depths under different loads. on different bolt foundations under the same load, the empirical value of the o in strongly weathered rock are Through applying vertical load ptimal length of vertical bolt in strongly weathered granite and gneiss within this area has been obtained, which provided practical experience for the application of vertical rock bolt foundation.