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| Research on the Reinforcement Mechanism of Prestressed Anchor Cable Lattice Beam and Its Site Verification |
| HUANG Chang-qian1, SHEN Yu-peng2, ZHAO Jiu-huan3, MAO Ling-feng2, YAN Xin-tong2, HE Yong-gui2 |
1. AVIC Geotechnical Egineering Institute Co. Ltd, Beijing 100098, China； 2. Beijing Jiaotong University, Beijing 100044,China;
3. Guizhou Transportation Planning Survey & Design Academe Co. Ltd, Guiyang, Guizhou 550081, China
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Abstract Abstract：Research purposes：In this paper, the reinforcement mechanism of the prestressed anchor cable lattice beam is analyzed in detail. Through long-term monitoring test in the district of Mentougou in Beijing, the change characteristic of soil pressures, the stresses of lattice beams and the cable prestress loss are studied.
Research conclusions：(1) The main reason to the dramatic change of soil pressure is the filling load. The change of soil pressure is the most dramatic in the first loading, and the change is not obvious the late loading. (2) The distribution of lateral soil pressure is not a simple rectangular, trapezoidal or triangular, and the relation of soil stress and time present the "W" type curves, for the existence of anchor cable. (3) The K value (ratio between the lateral pressure to vertical pressure) is related to the burying depth, and is greater than 1.0 in some cases. (4) The tensile stress will decreases over time in the anchor cable, and the re-tensioning the anchor tension is necessary for the permanent retaining wall. (5) The results can provide helpful references for the designer or maintenance staff to design or conserve the same retaining.
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