预应力锚索抗滑桩工程中预应力实测与损失值计算

Measurement of the pre-stress and calculation of the pre-stress loss in anti-slide pile with pre-stress anchor cable

某公路路基形成了高达28m的直立超高边坡,采用预应力锚索抗滑桩进行加固,桩长39m,最大悬臂高度28m。为确保边坡整治工程的安全施工及正常运行,选取了3根预应力锚索抗滑桩(7#、2#、4#)上的锚索作为监测对象,从锚索张拉之日起,定期对锚索的受力情况进行测试。本文重点对预应力锚索抗滑桩中的预应力损失值进行了定量计算,系统分析了影响锚索预应力损失的各项因素,为预应力锚索的设计、施工以及工程管理等提供了理论依据。

It is rare that a 28 meter vertical slope of the highway＇ s roadbed is formed in need of topography and planning. Anti-slide piles with pre-stress anchor cable were adopted for reinforcement of the slope, the length of piles is 39 meter, and the most cantilever height of piles is 28 meter. Anchor cables of three anti-slide piles （7 # , 2 # .4 # ） have been regularly tested since they were tensioned. Quantity of the pre-stress loss of anchor cable of the anti-slide piles was calculated for construction safety and normal operation of landslide with remedial work, each factor which affects the pre-stress loss of anchor cable in system was analyzed in the paper, it provides theoretical basis for the design and management of the anchor cables thereafter.