预应力锚杆技术加固涞滩摩崖造像危岩体

在涞滩石刻区分布的危岩体严重威胁着石窟造像和游人的安全，必须进行加固处理。用石刻摩崖危岩体稳定性分析评价方法，结合工程实例介绍了预应力锚杆新技术在摩崖造像危岩体加固工程中的应用，和施工工艺技术及整治效果。预应力锚杆可以有效地提高锚杆的极限抗拔力，减少锚杆数量，从而减少对石刻岩体表面的破坏。该项目被评为优质工程。该技术可以在全国地面物保护工程中推广应用。

Reinforcing collapsing blocks of Laitan Cliff by prestressed anchor

The possible collapsing blocks distributed over the carvings area of Laitan must be reinforced because they are seriously imperiling the safety of carvings and visitors, In this paper, the analyzing and evaluation method of stability of possible collapsing blocks in the carved stone area is introduced. Application of new technology of prestressed anchor in reinforcing the collapsing blocks of cliff is described according to an engineering example. The construction technology and the repairing effect are discussed in detail. Prestressed anchor can effectively increase the ultimate upright resistance of anchor and reduce anchor number, thus reduce the damage to the surface of carvings rockmass. The project has been evaluated as of high quality grade. The reinforcing technology by prestressed anchor can be popularized in the protection engineering of the ground cultural relics in China.