Development and application of a high-temperature and high-pressure true triaxial single-shear load transmission device for rocks
LIU Zaobao1, 2, LIU Binhui1, 2, HUANG Ruizhi1, 2, XU Jianyu1, 2, YANG Qiang1, 2, WANG Wenfang1, 2
(1. State Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern University, Shenyang, Liaoning 110819, China; 2. Institute of Deep Engineering and Intelligent Technology, Northeastern University,
Shenyang, Liaoning 110819, China)
Abstract：To elucidate the shear deformation and fracture behavior of rocks under the extreme conditions of deep engineering environments, an innovative true triaxial single-shear load transmission apparatus has been developed, accompanied by a corresponding method for true triaxial direct shear. This load transmission device is characterized by three key technologies: (1) A centrally symmetric double shear-double pressure interlocking load transmission structure has been engineered, overcoming the constraint of lateral stress/normal stress ≤ 1. This advancement allows for a more realistic and comprehensive restoration of the stress distribution state during the rock shear fracture process. (2) A hollow hydraulic self-balancing body has been designed, capable of withstanding oil pressures up to 70 MPa and temperatures of 150 ℃. This enhancement reduces the measurement error of shear strength by 52.7% to 75.4% compared to the previous silicone block approach, ensuring stability in load transmission at the flexible end of the shear component and guaranteeing the precise application and measurement of shear forces. (3) An embedded “sealant-cork layer-sealant” sandwich sealing configuration has been adopted, providing multiple layers of protection. This innovation marks a significant breakthrough in high-temperature and high-pressure true triaxial large displacement single-shear technology, accommodating shear displacement/specimen length ratios of up to 10%. High-temperature true triaxial single-shear experiments and acoustic emission monitoring were successfully conducted on granite specimens (50 mm×50 mm×50 mm). These experiments validate the reliability and expandability of the experimental setup. The apparatus features a straightforward structure with significant potential for widespread application, offering promising prospects for advancing studies on the shear mechanical properties of deep rock formations.
刘造保1，2，刘斌慧1，2，黄睿智1，2，徐建宇1，2，杨 强1，2，王文芳1，2. 岩石高温高压真三轴单面直剪传载装置研发与应用[J]. 岩石力学与工程学报, 2025, 44(10): 2580-2591.
LIU Zaobao1, 2, LIU Binhui1, 2, HUANG Ruizhi1, 2, XU Jianyu1, 2, YANG Qiang1, 2, WANG Wenfang1, 2. Development and application of a high-temperature and high-pressure true triaxial single-shear load transmission device for rocks. , 2025, 44(10): 2580-2591.
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2025, Vol. 44 
