砂土中水平锚板抗拔特性试验研究
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摘要
运用改装的试验装置和数据采集系统,对锚板在砂土中的抗拔特性进行系统的试验研究。分析不同砂土密实度条件下锚板抗拔力和位移的关系曲线特征,研究不同埋深比下抗拔力、破坏系数和破坏位移的变化规律,并根据破坏力与破坏位移随埋深比的变化趋势得到不同密实状态下的临界埋深比。研究结果表明:砂土密实度对锚板的抗拔性能有非常大的影响,增加砂土的密实度可以大幅度提高锚板的抗拔承载力,并显著减小锚板的位移变形;增加锚板的埋置深度同样可以大幅度提高锚板的抗拔承载力,但抗拔承载力的增加幅度受临界埋深比的限制,临界埋深比随密度增加有增大的趋势。以上试验结果可为建立锚板上拔预测模型提供参考依据。
An experimental investigation on uplift behavior of anchor plate in sand was presented. A series of model tests were performed to investigate the influence of soil particle size, soil density, and anchor embedment depth on uplift behavior. Using the modified test device and data acquisition system, the uplift behavior of the anchor plate in sand was systematically studied. The relationship between the pull-out force and the displacement of the anchor plate at different sand-soil densities was analyzed. The variation law of the pull-out force, the failure coefficient and the damage displacement at different depth-of-depth ratios were studied. According to the destructive force and the damage displacement, the variation trend of the embedment depth ratio was obtained by the critical embedment depth ratio at different soil densities. The results show that the soil density has a great influence on the uplift resistance of the anchor plate. Increasing the density of the soil can greatly improve the bearing capacity of the anchor plate and significantly reduce the displacement of the anchor plate. The embedment depth of the anchor plate can also greatly improve the bearing capacity of the anchor plate, but the increase of the bearing capacity is limited by the critical embedment depth ratio. This critical value increases with the increase of soil density. The above test results can provide reference for the establishment of an uplift prediction model of the anchor plate.
An experimental investigation on uplift behavior of anchor plate in sand was presented. A series of model tests were performed to investigate the influence of soil particle size, soil density, and anchor embedment depth on uplift behavior. Using the modified test device and data acquisition system, the uplift behavior of the anchor plate in sand was systematically studied. The relationship between the pull-out force and the displacement of the anchor plate at different sand-soil densities was analyzed. The variation law of the pull-out force, the failure coefficient and the damage displacement at different depth-of-depth ratios were studied. According to the destructive force and the damage displacement, the variation trend of the embedment depth ratio was obtained by the critical embedment depth ratio at different soil densities. The results show that the soil density has a great influence on the uplift resistance of the anchor plate. Increasing the density of the soil can greatly improve the bearing capacity of the anchor plate and significantly reduce the displacement of the anchor plate. The embedment depth of the anchor plate can also greatly improve the bearing capacity of the anchor plate, but the increase of the bearing capacity is limited by the critical embedment depth ratio. This critical value increases with the increase of soil density. The above test results can provide reference for the establishment of an uplift prediction model of the anchor plate.
引文
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[14]ZHU Honghu,MEI Guoxiong,XU Min,et al.Experimental and numerical investigation of uplift behavior of umbrella-shaped ground anchor[J].Geomechanics&Engineering,2014,7(2):165-181.
[15]朱鸿鹄,张诚成,施斌,等.GFRP锚杆拉拔时效模型研究[J].工程地质学报,2012,20(5):862-867.Zhu Honghu,Zhang Chengcheng,Shi Bin,et al.Physical modelling of time dependent pullout behavior associated with GFRP anchor[J].Journal of Engineering Geology,2012,20(5):862-867.
[16]ZHANG Chengcheng,ZHU Honghu,XU Q,et al.Time-dependent pullout behavior of glass fiber reinforced polymer(GFRP)soil nail in sand[J].Canadian Geotechnical Journal,2015,52(6):670-681.
[17]张昕,乐金朝,刘明亮,等.砂土中锚板的抗拔机理与承载力计算模型研究[J].岩土工程学报,2012,34(9):1734-1739.ZHANG Xin,YUE Jinchao,LIU Mingliang,et al.Uplifting behavior and bearing capacity of plate anchors in sand[J].Chinese Journal of Geotechnical Engineering,2012,34(9):1734-1739.
[18]OVESEN N.Centrifuge tests of the uplift capacity of anchors[C]//Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering,Stockholm,1981:717-722.
[19]IIAMPARUTHI K,DICKIN E A,MUTHUKRISNAIAH K.Experimental investigation of the uplift behaviour of circular plate anchors embedded in sand[J].Canadian Geotechnical Journal,2002,39(3):648-664.
[20]刘明亮,朱珍德,刘金元.锚板抗拉破坏机制试验研究[J].岩土力学,2011,32(3):697-702.LIU Mingliang,ZHU Zhende,LIU Jinyuan.Experimental study of failure mechanism of uplifting anchor[J].Rock and Soil Mechanics,2011,32(3):697-702.
[2]LIU H X.Recent study of drag embedment plate anchors in China[J].Journal of Marine Science and Application,2012,11(4):393-401.
[3]王洪涛,李术才,王琦,等.非线性破坏准则下水平浅埋条形锚板抗拔承载力的极限分析[J].工程力学,2014,31(2):131-138.WANG Hongtao,LI Shucai,WANG Qi,et al.Limit analysis of ultimate pullout capacity of shallow horizontal strip anchor plate based on nonlinear failure criterion[J].Engineering Mechanics,2014,31(2):131-138.
[4]HUECKEL S.Model tests on anchoring capacity of vertical and inclined plate[C]//Proc 6th Int Conf on Soil Mechanics and Foundation Engineering.London:Butterworth Scientific Publications,1957:203-206.
[5]NEELY W J,STEWART J G,GRAHAM J.Failure loads of vertical anchor plates in sand[J].Journal of the Soil Mechanics and Foundations Division,1973,99(9):669-685.
[6]HOSHIYA M,MANDAL J N.Some studies on anchor plates in sand[J].Soils and Foundations,1984,24(1):9-16.
[7]郝冬雪,符胜男,陈榕,等.砂土中锚板拉拔模型试验及其抗拔力计算[J].岩土工程学报,2015,37(11):2101-2106.HAO Dongxue,FU Shengnan,CHEN Rong,et al.Experimental investigation of uplift behavior of anchors and estimation of uplift capacity in sands[J].Chinese Journal of Geotechnical Engineering,2015,37(11):2101-2106.
[8]MURRAY E J,GEDDES J D.Resistance of passive inclined anchors in cohesionless medium[J].Geotechnique,1989,39(3):417-431.
[9]LIU J Y,LIU M L,ZHU Z D.Sand deformation around an uplift plate anchor[J].Journal of Geotechnical and Geoenvironmental Engineering,2012,138(6):728-737.
[10]赵炼恒,李亮,杨小礼,等.非线性破坏准则下法向受力条形浅锚抗拔力上限计算方法[J].中南大学学报(自然科学版),2009,40(5):1444-1450.ZHAO Lianheng,LI Liang,YANG Xiaoli,et al.Calculating method of upper bound for ultimate pullout capacity of vertically loaded strip plate anchors based on nonlinear Mohr-Coulomb failure criterion[J].Journal of Central South University(Science and Technology),2009,40(5):1444-1450.
[11]朱鸿鹄,张诚成,裴华富,等.GFRP土钉拉拔特性研究.岩土工程学报,2012,34(10):1843-1849.ZHU Honghu,ZHANG Chengcheng,PEI Huafu,et al.Pullout mechanism of GFRP soil nails[J].Chinese Journal of Geotechnical Engineering,2012,34(10):1843-1849.
[12]ZHU Honghu,YIN Jianhua,YEUNG A T,et al.Field pullout testing and performance evaluation of GFRP soil nails[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2011,137(7):633-641.
[13]ZHANG Chengcheng,ZHU Honghu,SHI Bin,et al.Experimental investigation of pullout behavior of fiber reinforced polymer reinforcements in sand[J].Journal of Composites for Construction,ASCE,2015,19(3):04014062.
[14]ZHU Honghu,MEI Guoxiong,XU Min,et al.Experimental and numerical investigation of uplift behavior of umbrella-shaped ground anchor[J].Geomechanics&Engineering,2014,7(2):165-181.
[15]朱鸿鹄,张诚成,施斌,等.GFRP锚杆拉拔时效模型研究[J].工程地质学报,2012,20(5):862-867.Zhu Honghu,Zhang Chengcheng,Shi Bin,et al.Physical modelling of time dependent pullout behavior associated with GFRP anchor[J].Journal of Engineering Geology,2012,20(5):862-867.
[16]ZHANG Chengcheng,ZHU Honghu,XU Q,et al.Time-dependent pullout behavior of glass fiber reinforced polymer(GFRP)soil nail in sand[J].Canadian Geotechnical Journal,2015,52(6):670-681.
[17]张昕,乐金朝,刘明亮,等.砂土中锚板的抗拔机理与承载力计算模型研究[J].岩土工程学报,2012,34(9):1734-1739.ZHANG Xin,YUE Jinchao,LIU Mingliang,et al.Uplifting behavior and bearing capacity of plate anchors in sand[J].Chinese Journal of Geotechnical Engineering,2012,34(9):1734-1739.
[18]OVESEN N.Centrifuge tests of the uplift capacity of anchors[C]//Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering,Stockholm,1981:717-722.
[19]IIAMPARUTHI K,DICKIN E A,MUTHUKRISNAIAH K.Experimental investigation of the uplift behaviour of circular plate anchors embedded in sand[J].Canadian Geotechnical Journal,2002,39(3):648-664.
[20]刘明亮,朱珍德,刘金元.锚板抗拉破坏机制试验研究[J].岩土力学,2011,32(3):697-702.LIU Mingliang,ZHU Zhende,LIU Jinyuan.Experimental study of failure mechanism of uplifting anchor[J].Rock and Soil Mechanics,2011,32(3):697-702.