大型地下洞室高边墙围岩固壁预应力锚固新技术研究

针对彭水水电站地下厂房薄层、陡倾角灰岩、夹软弱页岩自稳时间短、变形破坏机制不易被掌控等特点，系统地采用钢质楔头涨壳式预应力中空注浆锚杆新技术，及时加固浅层围岩；以钢垫板锚墩头替代混凝土锚墩头，简化施工工艺、保证工程质量、加快施工进度，使得围岩及时得以深层锚固，降低围岩卸荷变形的可能。新型锚固技术的综合应用，成功地解决了软弱页岩层的浅层和深层锚固问题，经济效益和社会效益显著，具有良好的应用推广价值。

Study on Prestressed Anchoring Technology Used in Large-scale Underground Power Plant

In order to solve the problems of steep-inclined limestone,poor self-support capability of weak and soft shale and difficulties in the control of the rock mass deformation in the construction of the underground power plant of Pengshui hydropower station,the new technology of expansion and prestressed type hollow grouting bolt with steel wedge is adopted to reinforce the shallow-covered rock mass.The anchor piers with steel plates,which are used to replace the original concrete anchor piers,can simplify the construction technology,ensure the construction quality and enhance the construction speed.Thus,the wall rocks are deeply and immediately anchored and the deformation risks of the wall rocks are minimized.The comprehensive application of the new anchoring technology ensures the shallow and/or deep anchoring quality in soft and weak shale.In addition,the new technology results in significant economic and social benefits and can be popularized.