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在岩土边坡工程中,通常采用预应力锚索(杆)加固不稳定边坡以改善其稳定性。然而,在工程实践中,为了确保工程的安全度,对边坡预应力锚固的设计大多过于保守,造成了极大的投资浪费,预应力锚固作用机理及设计理论方法还有待于深入研究。根据对岩体强度、工程安全等级和结构面特征等影响边坡预应力锚固参数的因素分析,分别讨论了锚固角、内锚固长度、锚索布置形式及锚孔间距的优化设计方法,并结合工程实例分析了该优化设计方法的合理性。
In geotechnical slope engineering, prestressed anchors (rods) are often used to reinforce unstable slopes to improve their stability. However, in engineering practice, in order to ensure the safety of the project, the design of slope prestressed anchoring is mostly conservative, resulting in a great waste of investment. The mechanism of prestressed anchorage and the design theory and method need to be further studied. Based on the analysis of factors influencing the prestressing parameters of rock slope, such as the strength of rock mass, the level of engineering safety and the characteristics of structural plane, the optimal design methods of anchorage angle, internal anchorage length, anchor cable layout and anchor hole spacing are discussed respectively The engineering example analyzes the rationality of the optimization design method.