Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5787631 | Engineering Geology | 2017 | 11 Pages |
Abstract
Understanding the long-term mechanical behavior of cracks in rock masses is important for engineering projects and for controlling rock mass stability, particularly on rock slopes. In this study, laboratory-prepared cubic sandstone samples with non-persistent joints were subjected to shear creep testing using a rock shear rheometer. The results indicate that long-term shear strength is influenced by the long-term internal friction angle and cohesion, and decreasing cohesion is a key factor for changes in long-term shear strength under constant load. Additionally, damage to the shear modulus is related to the initial damage conditions and joint persistence of the samples. A new creep model is developed that considers the effect of crack or joint length on time-dependent rock behavior. The elasto-viscoplastic behavior of non-linear creep is also described. The modified shear creep model shows promising results for estimation of failure time, shear creep deformation and long-term stability of a rock slope for cases where planar-type failure occurs along a crack or joint surfaces in which no cohesion exists in the crack or joint surface contacts.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geotechnical Engineering and Engineering Geology
Authors
L.Z. Wu, B. Li, R.Q. Huang, P. Sun,