一、前言 岩石内部加固技术正在不断发展。机械式端头锚固技术己落后于树脂、水泥全长锚固技术。开缝锚杆在开始使用的三年中,其使用量就占美国市场锚杆销售量的50％。树脂锚杆具有刚性和锚固力大的优点,机械式锚杆具有主动对岩石施加载荷和岩石对锚杆增阻最好的特点,而组合锚杆兼有这两种锚 I. INTRODUCTION Internal rock reinforcement technology is developing. Mechanical end anchoring technology has lagged behind resin, cement full-length anchoring technology. Slotted anchor in the first three years of use, the amount of its use on the US market sales of anchor 50%. Resin bolt has the advantages of rigidity and strong anchoring force. The mechanical anchor rod has the initiative to exert the load on the rock and the rock has the best resistance to the anchor rod. The composite anchor rod has both of these anchors