玻璃钢螺旋锚在修复膨胀土渠坡中的应用

Application of FRP Screw Anchor in Repairing of Canal Slope of Expansive Soils

一种新型的玻璃钢螺旋锚被试生产出来,该锚不会锈蚀、可自旋入土,锚杆具有柔性。介绍了玻璃钢螺旋锚、土工格栅和土工泡沫在修复膨胀土渠道滑坡中的应用,土工泡沫用以减小混凝土板衬砌下的膨胀力,土工格栅提高渠坡抗整体滑动的安全系数,玻璃钢螺旋锚用来锚固水上坡的混凝土框架梁和水下坡的混凝土板。给出设计方法和监测方案,并将该法与其他修复方法,如换填非膨胀土法、抗滑桩法以及土工格栅分层加筋法做了技术和经济比较,说明了该法的优越性。

A new kind of FRP screw anchor has been trial-produced, which can be turned into soil to a designed length with less disturbance and its rod is flexible and not prone to corrosion. The application of FRP screw anchor, geogrid and geofoam slab in repairing of canal slope of expansive soils has been introduced in this paper. The geofoam slab was used to reduce the expansive force under the concrete slab. The geogrid improved the factor of safety against complete sliding surface. And the FRP screw anchor was designed to anchor the concrete frame girder above the berm and concrete slab below the herin. The paper presents a design method and a monitoring plan for this project. The technical and economical comparisons with other schemes such as non-swelling soil replacement method, anti-slide pile and reinforcement of geogrid in layers prove that this scheme has remarkable advantages.