针对中风化砂岩地质条件，开展了单锚基础和承台式群锚基础的现场足尺试验研究，得到了荷载-位移曲线，分析了基础的破坏模式和承载性能。通过锚筋应变测试，研究了锚杆基础的内力分布规律和有效锚固深度。研究结果表明，岩石锚杆基础应用于中风化砂岩地基分布地区，满足输电线路上部结构对基础承载力的要求，具有良好的经济和社会效益；当锚杆锚固深度小于有效锚固深度时，增加锚固深度和承台嵌岩深度能够有效地提高基础的抗拔承载性能；水平荷载不是基础发生破坏的控制因素，但水平荷载对群锚基础上拔稳定存在不利影响。

According to the geological conditions of intermediate weathered sandstone ground, static load test of single anchor foundations and group anchor foundations were carried out. Based on the test results, the typical failure modes and the ultimate uplift bearing capacity of foundations are analyzed. Internal force distribution and effective anchorage depth are investigated through strain measurements. The results show that the rock anchor foundation can meet the bearing requirements of the upper structure for transmission line engineering. Rock anchor foundation benefits economically and socially when applied to intermediate weathered sandstone ground. When the anchorage depth of anchor is less than effective anchorage depth, the uplift bearing capacity of foundations can be improved by increasing anchorage depth and rock-socket depth. Horizontal load can affect the uplift stability of group anchors foundation adversely although it is not a control factor of foundation failure.