Abstract
This paper has the objective to reveal real‐time responses at several locations in reinforced bedded rock slopes under different rainfall conditions. Four scaled model tests have been conducted by varying rainfall patterns and slope inclinations, while several sensors, including fiber Bragg grating (FBG) displacement sensors, pore pressure sensors, and miniature pressure gauges, were instrumented in layers to capture corresponding responses during and after rainfall. The results show that the the slide of a reinforced bedded rock slope has a locking section, and the ultimate displacement under long‐term medium rainfall was about three times larger than that under short‐term storm rainfall. Meanwhile, the short‐term storm rainfall generated little influence on the deeper pore pressure for reinforced bedded rock slope. The pore pressure at the surface layer was initially larger and then smaller than that at the intermediate layer for the same slope. For the slope under long‐term medium rainfall, the shift moment was at 11.5 hours after testing started, while for the slope under short‐term storm rainfall, the shift moment was at 3.5 hours after testing started. The thrust pressure ascended with the rainfall persisting and descended a little after rainfall. The descending in thrust pressure was mainly due to the fact that the strength of slope mass recovered partially with water flowing out of the slope from the frontal portion and the slide tendency was weakened. These results can provide engineers with more acquaintance with response characteristics for these kinds of rock slope.
Highlights
Rainfall is recognized as one of the most significant influential factors for slope instability, especially for bedded rock slopes which are more prone to slide
A FBG displacement sensor consists of three portions: the first one is a hook in the slope mass which deforms with the surrounding materials, the second one is a steel wire connecting the hook with the tip of a beam, while the third one is a beam with a fiber Bragg grating on it
For the slope under long-term medium rainfall, the shift moment was at 11.5 hours after test started, while for the under short-term storm rainfall, the shift moment was at 3.5 hours after test started
Summary
Rainfall is recognized as one of the most significant influential factors for slope instability, especially for bedded rock slopes which are more prone to slide. Anchors and antislide pile are two kinds of common used geostructures to resist the slide thrust transferred from the upper instability slope body in a bedded rock slope. It is of great importance to further obtain and analyze the mechanical response of the reinforced structure to promote the safety assessment of bedded rock slopes under rainfall. A large amount of research has been focused on mechanical responses of reinforced structures, such as anchors and antislide piles, during its construction or initial service stage. E third one is that for the same kind of reinforced bedded rock slopes, internal response norm under different rainfall conditions is still unknown. Four sets of model tests have been undertaken by considering the inclination and rainfall conditions for a bedded rock slope reinforced by anchors and antislide piles. Responses during and after rainfall were monitored and analyzed graphically, and some early-warning suggestions were given according to corresponding test results. ese results can provide engineers with more acquaintance with response characteristics and highlight related reinforcement design essentials for these kinds of rock slope
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