摘要
预应力锚索加固岩体的效果取决于预应力的大小。为了保持岩体长期稳定，必须长期保持有足够的预应力。岩体随时间产生的变形、锚索松驰、腐蚀、结构的不同等因素都将造成锚索预应力损失。这对加固效果带来不良影响。本文着重研究岩体随时间的变形产生的预应力损失。锚索的预应力损失可按 计算。文中根据岩体的粘弹特性，分别推导了σ＿（ｆｔ）和σ＿（ａｔ）的计算公式。最后讨论锚固段和自由段的长度对减少预应力损失的作用。
The enfored effect of the prestressed cable bolts is determined by the value of prestress. The loads supplied by the cable bolts must be sufficient so that at all times the stability of rock mass is retained. The load losses of the cable bolts are produced by the deformation of rock mass depending on time,corrosion and different kinds of structures etc. These porduce the bad effect of enforcement.The paper mainly study the load losses produced by the deformation of rock mass depending on time. The load losses of the cable bolts can be found by.According to the visco-elastic properties of rock mass σtf and σat are established. Finally.the effect of the free and anchored length on decreasing the load losses is discussed.
出处
《工程地质学报》
CSCD
1995年第1期65-69,共5页
Journal of Engineering Geology
