(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. College of Environment and Civil Engineering，Chengdu University of Technology，Chengdu，Sichuan 610059，China；3. China Railway Eryuan Engineering Group Co.，Ltd.，Chengdu，Sichuan 610031，China；4. Sinohydro Bureau 7 Corporation Limited，Chengdu，Sichuan 610213，China)
Abstract：Cataclastic rocks are a special kind of weak rock mass developed in a strong tectonic zone，whose engineering mechanical properties are greatly influenced by disturbance or weak constraint. However，it is difficult to obtain undisturbed specimens of cataclastic rocks and to accurately measure its mechanical properties in the laboratory. Therefore，the confined compression test of undisturbed specimens which are obtained by investigating the in-situ undisturbed sampling devices and methods is done. The calculation model is established on the assumption of the linear axial shear stress along cylinder. Subsequently，the analytical solutions of deformation parameters under high stress by confined compression are derived. Moreover，the confined compression numerical test and the in-situ bearing plate test are conducted. The results show that：The variation range of acoustic velocity between specimens and sampling points is less than 5%，thus indicating that specimens obtained by steel cylinder devices with blades can basically keep their original structure characteristics. The average differences between calculated values and measured values of axial strain at different heights do not exceed 6.43%，which verifies the rationality of the distribution assumption of axial shear stress in the calculation model. The ratio of in-situ deformation modulus to analytical compression modulus are 0.17 and 0.36 respectively，when the rock pressure are less than and greater than 15.80 MPa. The average differences of comprehensive compression modulus and Poisson?s ratio between the analytical calculation and the numerical solution are 5.68% and 4.18% respectively，which verifies the reliability of the analytical calculation method for the compression deformation response. The research results can provide an effective method for testing the mechanical properties of cataclastic rocks，thus creating theoretical and practical values for the engineering construction of similar areas.
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2023, Vol. 42 
