随着地铁地下车站大跨径洞室的修建，出现了很多围岩坍塌病害问题，预应力锚索通过施加预应力对洞室围岩有良好的支护效果。针对地下洞室顶部的围岩特性，介绍在其支护设计中，确定预应力锚索自由段长度的一种方法。%With construction of large-span cavities at underground stations of metros, many disaster problems of wall-rock collapse occur, the prestressed anchored cables with application of prestress exhibits perfect supporting effect. In allusion to wall-rock characteristics on the top of underground cavities, this paper introduces a method of determining the length of free section of prestressed anchored cable in design of support.
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