宋军, 梁炯, 蔡强, 周云涛, 石胜伟, 张勇. 2018: 碳纤维布用于格构缺陷修复技术的模型试验研究. 工程地质学报, 26(4): 891-897. DOI: 10.13544/j.cnki.jeg.2018-048
    引用本文: 宋军, 梁炯, 蔡强, 周云涛, 石胜伟, 张勇. 2018: 碳纤维布用于格构缺陷修复技术的模型试验研究. 工程地质学报, 26(4): 891-897. DOI: 10.13544/j.cnki.jeg.2018-048
    SONG Jun, LIANG Jiong, CAI Qiang, ZHOU Yuntao, SHI Shengwei, ZHANG Yong. 2018: MODEL TESTS STUDY ON RECOVERY TECHNIQUE OF THE LATTICE DEFECTS USING CARBON FIBER CLOTH. JOURNAL OF ENGINEERING GEOLOGY, 26(4): 891-897. DOI: 10.13544/j.cnki.jeg.2018-048
    Citation: SONG Jun, LIANG Jiong, CAI Qiang, ZHOU Yuntao, SHI Shengwei, ZHANG Yong. 2018: MODEL TESTS STUDY ON RECOVERY TECHNIQUE OF THE LATTICE DEFECTS USING CARBON FIBER CLOTH. JOURNAL OF ENGINEERING GEOLOGY, 26(4): 891-897. DOI: 10.13544/j.cnki.jeg.2018-048

    碳纤维布用于格构缺陷修复技术的模型试验研究

    MODEL TESTS STUDY ON RECOVERY TECHNIQUE OF THE LATTICE DEFECTS USING CARBON FIBER CLOTH

    • 摘要: 格构锚固是边(滑)坡工程常用的防治技术之一,长期服役的格构梁通常会产生局部破损的现象,影响边(滑)坡长期稳定性,而贴附碳纤维布是修复格构梁缺陷最行之有效的手段。采用室内模型试验槽填筑黏土方式模拟滑坡体,设计相似比为1:10的格构梁,通过千斤顶施加滑坡推力,开展碳纤维布用于格构缺陷修复技术的模型试验,监控格构梁后部土压力、格梁应力、格梁位移等参数,分析碳纤维布修复前后格构梁和碳纤维布两者的荷载分担比、钢筋应力改善情况和格梁弯矩的前后变化规律。试验数据分析表明,碳纤维布和格构梁荷载分担比得到了改善,滑坡推力作用在碳纤维布和格构梁复合体时,碳纤维布先于格构梁受力,并且受力远远大于格构梁,碳纤维布所承受的荷载分担比约为83%;格梁破坏首先为受拉破坏,然后为受压破坏;模型试验中,在钢筋表面粘贴了应变片,监测到钢筋的应变情况,碳纤维布修复后钢筋受力得到改善,修复后的最大钢筋应力比修复前降低了8倍多;对修复前后,格构梁弯矩变化进行了研究,碳纤维布修复后格梁弯矩显著降低,约为修复前的1/10-1/3。鉴于以上研究结果,说明碳纤维布用于修复、加固缺陷格构梁工程效果显著。

       

      Abstract: The lattice framed anchor structure is one of popular prevention technologies in the slope and landslide engineering. The local damage generally occurs to the lattice beam in long-term service, which would have impact on the long-term stability of slope or landslide. For this purpose, attaching carbon fiber cloth to the lattice beams is the most proven effective measure to repair the defects of lattice beams. This paper simulated the landslide mass by way of filling clay in the tank of indoor model test, designed the lattice beams with a similarity ratio of 1:10, and conducted model experiment of carbon fiber cloth applying to the repairing technology of lattice defects by using the lifting jack to exert the landslide load, so as to monitor the parameters including the soil pressure at the bottom of lattice beam, stress of lattice beam and displacement of lattice beam, and analyzed the load bearing ratio between the lattice beam and the carbon fiber cloth before and after repair by using carbon fiber cloth, improvement of steel stress and laws of previous and present change in the bending moment of lattice beam. It showed through analysis of experimental data that the load bearing ratio between the carbon fiber cloth and the lattice beam was improved. When the landslide load acted on the composite of carbon fiber cloth and lattice beam, the carbon fiber cloth sustained the load ahead of the lattice beam, and the load sustained by the carbon fiber cloth was greater than that sustained the lattice beam, with the load bearing ratio of about 83% for the carbon fiber cloth. The lattice beam was damaged by tension first and then compression. In the model test, the strain gages were stuck in the surface of steel to monitor the strain of steel and that the stress in the steel was improved after the damage was repaired, and the maximum stress in steel after repaired was approximately 1/8 of that before repaired. This paper studied the change in bending moment of lattice beam before and after the lattice beam was repaired, which found that the bending moment of lattice beam was significantly decreased upon repair using the carbon fiber cloth, about 1/10-1/3 of what it was before repairing. In consideration of the research results above, it is remarkably effective for the carbon fiber cloth to be used to repair and reinforce the defective lattice beam engineering.

       

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