软岩地层多段扩体锚杆施工工艺及拉拔试验
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摘要
改变锚固体直径、改善锚固体与岩土间界面特性是提高锚杆抗拔承载力的重要途径。软岩地层多段扩体锚杆采用机械扩孔工艺施工,进行多级循环加载卸载试验,根据锚杆的荷载-位移曲线及现场变形破坏特征,确定锚杆破坏模式为钢筋先屈服,最后钢筋被拔出,同时锚固体被拉裂。试验结果表明多段扩体抗浮锚杆施工工艺可行,锚杆抗拔承载力高,实际工程中能满足抵抗较高水浮力的需求。
Anchorage diameter and interface characteristics of soil-anchorage body are critical factors to affect the ultimate bearing capacity of anti-floating anchor.The rotary jet grouting anchors are constructed and the cycle loading pullout tests of anchors are conducted in the layer of soft rock.The test results show that anchors' failure mode has the process of rebar yielded first,then pulled out and anchorage body drawing breakage.The ultimate bearing capacity value of anchors is more than 900 kN,which can meet the requirment of practical engineering.
Anchorage diameter and interface characteristics of soil-anchorage body are critical factors to affect the ultimate bearing capacity of anti-floating anchor.The rotary jet grouting anchors are constructed and the cycle loading pullout tests of anchors are conducted in the layer of soft rock.The test results show that anchors' failure mode has the process of rebar yielded first,then pulled out and anchorage body drawing breakage.The ultimate bearing capacity value of anchors is more than 900 kN,which can meet the requirment of practical engineering.
引文
[1]马占峰.拉力型抗浮锚杆的现场测试与数值分析[D].北京:中国地质大学,2008.
[2]赵明华,刘峻龙,龙照.锚杆变形分析与临界锚固长度计算[J].建筑科学与工程学报,2008,25(3):17-21.
[3]孙涛,杨俊杰,安庆军,等.土层抗浮锚杆承载力关键影响因素现场试验研究[J].中国海洋大学学报(自然科学版),2011,41(11):18-22.
[4]陈志博,王向军,丁文其.大直径可回收锚杆力学特性数值分析[J].岩土工程学报,2012,34(增刊):172-176.
[5]胡建林,张培文.扩体型锚杆的研制及其抗拔试验研究[J].岩土力学,2009,30(6):1615-1619.
[6]郭钢,刘忠,李永康,等.扩体锚杆拉拔破坏机制模型试验研究[J].岩石力学与工程学报,2013,32(8):1677-1684.
[7]陈帅,卢廷浩,马露.抗浮锚杆的抗拔承载力分析和数值模拟[J].水利与建筑工程学报,2013,11(5):39-44.
[8]曾庆义,杨晓阳,杨昌亚.扩大头锚杆的力学机制和计算方法[J].岩土力学,2010,31(5):1359-1367.
[9]李哲,李滨,高磊,等.多段扩大头锚杆在砂土中的模型试验研究[J].西安理工大学学报,2016,32(3):259-265.
[10]贾欣媛,岳大昌,李明,等.一种岩石地层多段扩体锚杆[P].ZL 2017 21220898.9,2018-05-04.
[2]赵明华,刘峻龙,龙照.锚杆变形分析与临界锚固长度计算[J].建筑科学与工程学报,2008,25(3):17-21.
[3]孙涛,杨俊杰,安庆军,等.土层抗浮锚杆承载力关键影响因素现场试验研究[J].中国海洋大学学报(自然科学版),2011,41(11):18-22.
[4]陈志博,王向军,丁文其.大直径可回收锚杆力学特性数值分析[J].岩土工程学报,2012,34(增刊):172-176.
[5]胡建林,张培文.扩体型锚杆的研制及其抗拔试验研究[J].岩土力学,2009,30(6):1615-1619.
[6]郭钢,刘忠,李永康,等.扩体锚杆拉拔破坏机制模型试验研究[J].岩石力学与工程学报,2013,32(8):1677-1684.
[7]陈帅,卢廷浩,马露.抗浮锚杆的抗拔承载力分析和数值模拟[J].水利与建筑工程学报,2013,11(5):39-44.
[8]曾庆义,杨晓阳,杨昌亚.扩大头锚杆的力学机制和计算方法[J].岩土力学,2010,31(5):1359-1367.
[9]李哲,李滨,高磊,等.多段扩大头锚杆在砂土中的模型试验研究[J].西安理工大学学报,2016,32(3):259-265.
[10]贾欣媛,岳大昌,李明,等.一种岩石地层多段扩体锚杆[P].ZL 2017 21220898.9,2018-05-04.