预应力锚索摩阻力试验研究及危害性探讨  

Test research on frictional resistance of prestressed anchor cable and discussion on harm of frictional resistance

作　　者：朱安龙[1] 徐建强[1] 张萍[1] 

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州310014

出　　处：《人民长江》2015年第21期93-97,共5页Yangtze River

摘　　要：预应力锚索是目前高边坡工程和洞室围岩支护的重要手段,由于锚索摩阻力的存在,导致锚固力不能有效传递,在岩体发生变形时,极易在张拉端形成应力集中从而导致锚索破坏。提出一种新型的让压锚索,通过现场试验,对摩阻力进行测试并对其形成机理和存在的危害进行了探讨。分析认为,目前锚索居中和绑扎方式是影响摩阻力的重要因素,摩阻力的存在是削弱锚索变形能力和产生预应力损失的重要原因。Prestressed anchor cable is an important means to support the high rock slope and the surrounding rock of cave at present. However, the anchoring force can not be transferred due to the existence of frictional resistance of prestressed anchor ca- ble. The stress can be easily concentrated in the tensioning section and damages the prestressed anchor cable when rock mass de- forms. The pre - tension yield anchor cable, a new kind of anchor cable, is put forward. The test on the frictional resistance is performed and the forming mechanism of frictional resistance and harm are discussed. The result showed that the centering layout and the binding form of cable are the influential factors of the frictional resistance, and the frictional resistance is an important cause for the wakening of the anchor cable~ deformability and the prestress loss.

关 键 词：预应力锚索 让压锚索 摩阻力 预应力损失 

分 类 号：TV52[水利工程—水利水电工程]