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随着水利水电工程的高速发展,地下洞室工程的规模也随之不断增大,以大跨度,高边墙著称的地下厂房尺寸越来越大。在地下工程的设计和施工中,为了及时限制有害变形的发展,保证围岩的稳定,洞室开挖中适时支护是非常必要的。根据工程的不同情况,要做到及时支护,采用喷混凝土、锚杆、预应力锚杆或联合支护的方式最为行之有效。其中以预应力锚杆加固的效果最为明显。
With the rapid development of water conservancy and hydropower projects, the scale of underground cavern projects will also continue to increase. The size of the underground powerhouse, which is famous for its large-span and high-side walls, is getting bigger and bigger. In the design and construction of underground engineering, in order to promptly limit the development of harmful deformation, to ensure the stability of surrounding rock, timely excavation support in the cavern is necessary. According to the different circumstances of the project, to achieve timely support, the use of sprayed concrete, bolt, prestressed anchor or joint support the most effective way. Among them, the effect of prestressed anchor reinforcement is the most obvious.