MODEL TEST RESEARCH ON THE FORCE MECHANISM OF TENSILE TYPE ANCHORAGE SEGMENT UNDER BOREHOLE DEVIATION

Abstract

Prestressed anchor cable technology as one of the most effective reinforcement technology has been widely used in railway, highway, water conservancy and hydropower, industrial and civil construction projects. Because of the influence of geological factors and technical factors in practical engineering construction of anchor cable and hole inclination and prone to bending problems, especially in the big tonnage-long hole deep anchor drilling the problem is particularly prominent. To obtain the force characteristic of anchor cable channel bending case, carried out under the condition of channel bend of the full-scale model test indoor, with a certain strength of concrete to simulate rock mass, and embed have certain radian of anchor cable components, through classifying tensioning prestressed anchor rope to measure under the condition of bending stress in the process of hole anchor rope around shear stress, axial stress and earth pressure strength. Test results show that in the case of bend channel, inner side and outside of the cable anchorage segment of shear stress distribution is not exactly same and the anchoring bend the inside of the shear stress is larger than the lateral shear stress values when tension load at the same level; axial force along the anchor length direction from large to small, until to 0; soil pressure outside the grouting body on both sides of the same change rule in addition to the compression of the medial, lateral tension.