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A model test investigation on prestressed anchor cable support for the Haidong fault tunnel
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-15 , DOI: 10.1016/j.tust.2025.106396
Zhigang Tao, Xiaotian Lei, Keyuan Liu, Ruixue Zhang, Xiaowei Fan, Mingjiu Cai

The support of fault tunnels is one of the key factors limiting tunnel construction. Prestressed anchor cables are proposed as a new type of support. However, there are few quantitative studies on tunnel excavation failure and support mechanisms. On the basis of the background of the tunnel in the Haidong fault fracture zone of the water diversion project in central Yunnan and using the excavation compensation method, a self-developed three-dimensional geomechanical model box is employed to conduct tunnel excavation tests. The displacement field, temperature field, stress field changes and mechanical mechanisms under the support of prestressed anchor cables are studied, and the support effect of high preload anchor cables is verified in practical engineering. The test results show that high pretightening force anchor cable support can better influence the self-bearing capacity of the surrounding rock. When overload failure occurs, bolts are subjected to brittle fracture failure, whereas anchor cables experience flexible bending deformation failure. The area enclosed by the characteristic curve of the surrounding rock after anchor cable support and that of the unsupported surrounding rock can be used as a potential quantitative representation method for the increase in the self-bearing capacity of the surrounding rock. Field monitoring results indicate that bolt support at nonfault locations and anchor cable support at fault locations have better effects on controlling surrounding rock deformation.

中文翻译:


海东断裂隧道预应力锚索支护模型试验研究



断层隧道的支撑是制约隧道建设的关键因素之一。预应力锚索作为一种新型的支撑被提出。然而,关于隧道开挖破坏和支护机制的定量研究较少。以滇中引水工程海东断层断裂带隧道为背景,采用开挖补偿法,采用自主研发的三维岩土力学模型箱进行隧道开挖试验。研究了预应力锚索支护下的位移场、温度场、应力场变化和机械机构,并在实际工程中验证了高预紧锚索的支护效果。试验结果表明,高预紧力锚索支撑能较好地影响围岩的自承载力。当发生过载破坏时,螺栓会发生脆性断裂失效,而锚索会经历柔性弯曲变形失效。锚索支撑后围岩特征曲线与无支撑围岩特征曲线所围合的面积,可作为围岩自承载力增加的潜在定量表示方法。现场监测结果表明,非断层位置的锚杆支护和断层位置的锚索支护对控制围岩变形的效果更好。
更新日期:2025-01-15
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