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小浪底工程地下厂房永久支护，在国内首次采用DSI系统双层保护锚索。锚索体内锚固段有双层防腐保护，第一层为水泥浆或水泥砂浆，第二层为锚索体外封闭的PVC波纹管。根据地下厂房顶拱支护的需要，锚索采用150dkN级，由10根钢铰线组成，长25m，锚固段长6m，间排距为4．5m×6．0m。现场的拉拔试验和工程实践表明，该锚索适合于小浪底层状围岩，特别是对于大跨度地下洞室支护，施加预应力锚索是必要的，可有效控制围岩变形，确保洞室稳定。
Xiaolangdi project underground plant permanent support, the first time in China using DSI system double protection anchor. Anchoring cable anchor body double anti-corrosion protection, the first layer of cement slurry or cement mortar, the second layer of the anchor cable PVC bellows closed. According to the need of roof arch support in underground powerhouse, the anchor cable adopts 150dkN grade and consists of 10 steel hinge lines with a length of 25m and an anchorage length of 6m with a row spacing of 4.5m × 6.0m. The drawing test and engineering practice in the field show that the cable is suitable for the surrounding rock of Xiaolangdi, especially for long-span underground caverns. It is necessary to apply prestressed anchor cable to effectively control the deformation of the surrounding rock and ensure that the hole Room is stable.