To obtain the optimal anchorage length for soilrock
composite strata, indoor tests, numerical simulations, and engineering tests
are conducted to investigate the working conditions for two types of anchorage
lengths (12 m and 8 m). The results show the following: (1) The peak shear
stress transfers from the beginning to the end of the anchorage section under
the tension load, while the peak shear stress is low and the axial force decay
rate is high in the anchorage in clayey soil gravel sandstone layer. (2) With
the increase of tension load, the anchorage section in clayey soil gravel
sandstone layer gradually transforms from tensile stress zone to compressive
stress zone, the transfer rate of stress to the depth is low, and the anchorage
solid has the characteristics of poor resistance to external load and high
deformation. (3) The anchor cable axial force can be divided into three
evolutionary stages: loss of prestress, rise, and fluctuation, and when the
anchorage section passes through the clayey soilgravel
sandstone layer, the prestress is lost in the fluctuation stage, and the
prestress is nonuniformly distributed in different
directions. (4) It is recommended to avoid anchoring in the soilgravel sandstone layer when the anchor cable passes through the soilrock composite strata.
LIU Xue, GUO Tingke, SHEN Long, WANG Xin, XU Dongming, ZHAI Zhaoxi
. Anchorage Mechanism and Field Tests of Prestressed
Anchor Cables with Different Anchorage Lengths in SoilRock Composite Strata[J]. Tunnel Construction, 2023
, 43(S1)
: 154
-162
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.018
