中风化花岗岩中抗浮锚杆的试验研究

 抗浮锚杆已经在我国许多地区得到广泛应用。但是不同规范推荐采用的锚杆设计参数变化范围较大，并且未考虑不同地区岩石的差异性，实际应用中不利于设计参数的选取。在青岛大剧院工程场地上对设置测力元件的抗浮锚杆进行破坏性拉拔试验，重点测试锚杆杆体的轴力、杆体与注浆体之间的剪应力变化规律，结果显示内力沿锚杆长度不均匀分布并且超过一定长度后不再受力，进而确定出该地区中风化花岗岩中抗浮锚杆的极限抗拔力和有效的锚固段长度，为抗浮锚杆设计、施工提供了依据。

EXPERIMENTAL INVESTIGATION ON ANTI-FLOATING ANCHOR IN MODERATELY WEATHERED GRANITE

Anti-floating anchors have been widely used in China. In the design practice of anti-floating anchors，the design parameters recommended by several current standards change largely without considering the differential mechanical properties of rocks in different areas. On the project of the Great Theatre of Qingdao，the destructive pull-out tests on anti-floating anchors equipped with strain gauges were carried out. The distribution of axial force along the length of anchor and the shear stress between the grout and anchor rod were obtained. The test results indicate that the internal force distribution is not uniform，and no force exists after a certain length. The ultimate pullout resistance and the effective anchorage length of the anti-floating anchors were determined，which may be taken as reference for the design and construction of anti-floating anchors.