Failure Characteristics of Rock Sample during Penetration Tests with the Assistance of Different Free Surface Combinations
نویسندگان
چکیده
Abstract Free surface-assisted TBM disc cutter for rock breaking is an important direction the optimizing of structure. To study influence free surface on excavation, surfaces limited-width opening and unlimited-width were presented, six different combinations proposed. The penetration tests sandstone with carried out. results showed that mass adjacent to fell off after sample fracture. caused close broke. Under combinations, auxiliary effect was not obvious when depth shallow, failure morphology changed from vertical splitting inclined fracture increase depth. rock-breaking method can reduce energy consumption during breaking. Among all cumulative before peak load SDL dropped most 37.62% intact sample. Finally, affect design layout TBM.
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ژورنال
عنوان ژورنال: Lithosphere
سال: 2022
ISSN: ['1941-8264', '1947-4253']
DOI: https://doi.org/10.2113/2022/6216548