Shear and failure characteristics of ox leg anti-floating structure in rock strata
WANG Linfeng1，2，3，LIU Xinrong1，2，3，ZHOU Xiaohan1，2，3，LIU Peng1，2，3，LI Longping4，ZHAO Shunlei5
(1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas，Chongqing University，Chongqing 400045，China；3. Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education，Chongqing University，Chongqing 400045，China；4. China Railway Major Bridge Reconnaissance and Design Institute Co.，Ltd.，Wuhan，Hubei 430056，China；5. CCCC Second Highway Engineering Bureau Co.，Ltd.，Xi'an，Shaanxi 710054，China)
Abstract：In order to explore the working characteristics of a new type of anti-floating structure in rock layer，that is，the ox leg anti-floating structure，based on the actual boundary conditions of the structure，the shear test device was designed and the indoor shear test was carried out to analyse the shear failure characteristics. The deformation evolution process，shear failure mode and damage evolution law were investigated by digital image correlation method and acoustic emission method. The results show that：(1) According to the characteristics of strength and deformation，the structural shear process can be divided into initial compaction stage，approximate linear elastic deformation stage，initial microcrack initiation and propagation stage，slow compression shear nonlinear deformation stage，stress brittle drop stage and plastic flow deformation stage. (2) The peak shear stress τp and peak shear displacement up show a“parabolic”trend of first increasing and then decreasing with the decrease of the leg angle，and show an approximately“inverse proportional function”trend of increasing with the increase of the leg height. (3) The failure starts from one fracture-prone area，and then successively breaks through in multiple fracture-prone areas. The shear failure mode is mainly characterized by compression shear on the left side，tension shear on the right side，and slip on the interface，with local small cracks. (4) With the increase of the leg angle，the failure mode changes from the slip along the interface to the penetrating failure along the interior of the material. With the increase of the leg height，the failure mode changes from the rapid pulling at the upper right corner to the slip along the interface and the reverse cracking at the leg to the upper and lower sides. (5) As the leg angle decreases，the duration of AE phase I is almost the same，while the duration of AE phase II increases first and then decreases，and the AE activity increases first and then decreases. As the leg angle increases，the duration of AE phase I is almost the same，and the duration of AE phase II increases gradually，and the AE activity increases gradually. The conclusion is helpful to guide the design of the ox leg anti-floating structure from limit state.
王林枫1，2，3，刘新荣1，2，3，周小涵1，2，3，刘 鹏1，2，3，李隆平4，赵顺磊5. 岩质地层牛腿抗浮结构剪切力学特性及破坏特征研究[J]. 岩石力学与工程学报, 2023, 42(6): 1466-1481.
WANG Linfeng1，2，3，LIU Xinrong1，2，3，ZHOU Xiaohan1，2，3，LIU Peng1，2，3，LI Longping4，ZHAO Shunlei5. Shear and failure characteristics of ox leg anti-floating structure in rock strata. , 2023, 42(6): 1466-1481.
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2023, Vol. 42 
