Open AccessExperimental study on creep characteristics of anchorage rock with cracks under cable pulling condition
Author(s) -
Xiaoming Sun,
Li Cui,
Jiangchun Hu,
Zhang Yong
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/570/2/022040
Subject(s) - creep , rock mass classification , geotechnical engineering , shear (geology) , geology , intersection (aeronautics) , structural engineering , materials science , engineering , composite material , petrology , aerospace engineering
The creep characteristics of anchorage rock mass with cracks are the basis for the stability control of anchorage rock and current research hotspots. Relying on the Muzhailing soft rock tunnel project, the anchorage segment is taken as the research object, numerical simulation as the main method is used to systematically study the instantaneous and creep mechanical properties of rock with different crack combinations under the condition of cable pulling, the results show that: 1) Under instantaneous pulling conditions, the effective anchorage range is funnel-shaped, and the maximum value of the maximum shear stress(MSS) appears at the front end of the anchorage rock, while under long-term pulling conditions, the effective anchorage range is uniform along the cable axis distribution, the maximum value of the MSS appears at the end of the cable; 2) Cracks with specific combinations can expand the anchorage range along the axial direction and slow down the shear failure at the front end of the anchorage rock, which is especially obvious for the anchorage rock under instantaneous pulling conditions 3) The optimal number of cracks and the specific area can be obtained by the "virtual intersection method". For the instantaneous MSS and the creep MSS, there is an obvious 45° crack angle effect. The research results are intended to provide a reference for further probing the creep mechanism of anchorage rock with complex crack combinations.