Shearing behavior of interface between anchor bolt grouted body and cohesive soil
DAI Zihang1, 2, 3, ZHOU Chong2, CHEN Caihuan4, CHEN Zhongyuan1
(1. School of Intelligent Construction, Fuzhou University of International Studies and Trade, Fuzhou, Fujian 350202, China; 2. College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350108, China; 3. Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources and Fujian Key Laboratory of Geohazard Prevention,
Geological Engineering Survey in Fujian Province, Fuzhou, Fujian 350002, China; 4. Fujian Provincial
Transportation Research Institute Co., Ltd, Fuzhou, Fujian 350101, China)
Abstract：Anchor bolts are widely used in geotechnical anchorage engineering. In situations where anchorage segments of limited length cannot be embedded into a rock layer, anchor bolts are typically installed in stable cohesive soils. However, the shear behavior of the interface between the cohesive soil and the grouted anchorage body of an anchor bolt is not yet fully understood, often resulting in a significant discrepancy between the design bearing capacity and the measured capacity of the anchor bolt. To address this, a slight modification was made to the conventional strain-controlled direct shear apparatus. Subsequently, shear tests were conducted on this interface under varying contact pressures, different surface roughnesses, moisture contents of the soil, and cement mortars with varying water-cement ratios. The modes of shear failure and the shear stress-shear displacement relationships of the interfaces under these conditions were examined. The key findings are: (1) the shear stress-shear displacement relationship at the interface typically exhibits a nonlinear strong softening behavior, with rougher soil surfaces showing a more pronounced relationship; however, the degree of softening decreases with increasing contact pressure; (2) the peak and residual shear strengths demonstrate a nonlinear relationship with respect to contact pressure; (3) the shear displacements corresponding to the peak and residual shear strengths generally do not exceed 4 mm and 6 mm, respectively. Therefore, in cohesive soils, increasing the roughness of the anchor bolt hole wall and moderately increasing the grouting pressure (or re-grouting at a higher pressure to enhance the contact pressure between the soil and the anchorage body) can improve the bearing capacity of the anchor bolt. This experimental study provides a foundation for accurately representing the shear stress-shear displacement relationship at the interface between cohesive soil and the grouted body using a mathematical function, or for establishing an accurate constitutive model for this type of interface using elastoplastic mechanics theory.
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2025, Vol. 44 
