Abstract
Rock mass failure caused by jointed plane is the common disaster in geotechnical engineering. Research on shearing property of jointed rock mass with prestressed anchor bolt and its mechanical property is an aspect for the stability analysis of rock slope and tunnel. This paper studies the stress and deformation of bolt and jointed plane, as well as anchored body and rock mass during shearing by indoor model testing and theoretical analysis. The shearing strength and mechanical property of anchored jointed plane have been systematically studied, and the additional force caused by deformation of prestressed anchor bolt and jointed rock mass during the shearing has been proposed and verified. The anchorage interaction between rock mass and bolt is revealed.
Highlights
If major force length is de ned as twice the e ective length of bolt deformation, when prestressed bolt is anchored perpendicular to jointed plane, with shear load caused by the development of shear displacement, the major force length of bolt can be formulated as follows: 2Lp
With the increase of normal stress, the normal displacement caused by jointed plane climbing angle decreases
(2) After anchored, the bolt deforms as “S” shape during shearing process; and the prestressed bolt is divorced from cement grout within certain range and loses e ectiveness correspondingly
Summary
The jointed planes scattered within rock mass are not always parallel, and most times, the two surfaces of jointed plane are full of irregular convex pieces with great discontinuity and undulation, resulting in significant differences of mechanical properties according to their shape. Based on Patton’s shear strength equation of irregular indented jointed plane under lower normal stress level, the critical normal stress of jointed plane climbing under different normal stress is proposed: σm. Where σm (MPa) is the critical normal stress under the condition that no climbing failure occurs on the jointed plane; φr is the rock internal friction angle; cr (MPa) is the rock cohesion; φj is the jointed plane friction angle; cj (MPa) is the jointed plane cohesion; and i is the climbing angle of indented jointed plane Erefore, under different normal stress level, indented jointed plane shows different shear failure strength during the climbing period:. The jointed plane strength can be greatly promoted and its mechanical properties will become more sophisticated. us, indoor model testing combined with theoretical analysis is necessary to study the bolted jointed plane, in order to determine the contribution and influence of the prestressed bolt for the shear strength of jointed plane
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