GFRP锚杆在抗浮工程中的研究现状与展望
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摘要
GFRP抗浮锚杆是解决杆体腐蚀问题的有效途径之一,在地下结构抗浮工程中具有广阔的应用前景,首先分析了近年来GFRP抗浮锚杆的基本组成、工作特性及设计方法等方面的研究现状,其次详细介绍了GFRP抗浮锚杆内锚固和外锚固试验研究进展,总结和分析了GFRP抗浮锚杆的锚固机理特性:在拉力载荷作用下,内锚固段的破坏形式主要为杆体拔断和发生剪切位移,承载力与锚固段直径和长度呈正相关性,但存在临界锚固长度,轴力与剪应力分布范围在距孔口0～3 m范围之间;外锚固段的破坏形式为拔出、劈裂和滑移三种,锚具锚固可比直锚提供更高的承载力,弯曲锚固的弯曲半径和弯折长度对承载力有直接影响,外锚固段的载荷-滑移量关系曲线呈三阶段变化形式。最后,对GFRP抗浮锚杆在抗浮体系承载与变形特性研究、基于地下水位预测的稳定性计算和GFRP抗浮锚杆制作/设计/施工一体化技术方面的工作进行了展望。
GFRP anti-floating anchor is one of the effective ways to solve the corrosion problem of the rod body and it has a broad application prospect in the anti-floating engineering of underground structures. In this paper,the basic composition,working characteristics and design method of GFRP anti-floating anchor in recent years are analyzed. The research progress of inner and external anchorage of GFRP anti-floating anchor is introduced in detail.The anchoring mechanism characteristics of GFRP anti-floating anchor are summarized and analyzed. Under the action of tension load,the main failure modes of the inner anchorage are the bar pull-out and shear displacement. The bearing capacity is positively correlated with the diameter and length of anchorage segment,but there is a critical anchorage length. The distribution range of axial force and shear stress is between 0 and 3 m from the aperture. The failure modes of external anchorage section are three kinds of pullout,splitting and sliding. Anchor anchorage provides higher bearing capacity than straight anchor,and the bending radius and bending length of flexural anchorage have a direct bearing on the bearing capacity. The load-slip relationship curve of the external anchorage section presents a three stage change form. Finally,the research work about the bearing and deformation characteristics of GFRP anti-floating anchor in anti-floating system,the stability calculation based on groundwater level prediction and GFRP anti-floating anchor fabrication/design/construction integration technology are prospected.
GFRP anti-floating anchor is one of the effective ways to solve the corrosion problem of the rod body and it has a broad application prospect in the anti-floating engineering of underground structures. In this paper,the basic composition,working characteristics and design method of GFRP anti-floating anchor in recent years are analyzed. The research progress of inner and external anchorage of GFRP anti-floating anchor is introduced in detail.The anchoring mechanism characteristics of GFRP anti-floating anchor are summarized and analyzed. Under the action of tension load,the main failure modes of the inner anchorage are the bar pull-out and shear displacement. The bearing capacity is positively correlated with the diameter and length of anchorage segment,but there is a critical anchorage length. The distribution range of axial force and shear stress is between 0 and 3 m from the aperture. The failure modes of external anchorage section are three kinds of pullout,splitting and sliding. Anchor anchorage provides higher bearing capacity than straight anchor,and the bending radius and bending length of flexural anchorage have a direct bearing on the bearing capacity. The load-slip relationship curve of the external anchorage section presents a three stage change form. Finally,the research work about the bearing and deformation characteristics of GFRP anti-floating anchor in anti-floating system,the stability calculation based on groundwater level prediction and GFRP anti-floating anchor fabrication/design/construction integration technology are prospected.
引文
[1]唐孟雄,胡贺松,张程林.地下结构抗浮[M].北京:中国建筑工业出版社,2016.
[2]沈小克,周宏磊,王军辉,等.地下水与结构抗浮[M].北京:中国建筑工业出版社,2013.
[3]曾国机,王贤能,胡岱文.抗浮技术措施应用现状分析[J].地下空间,2004,24(1):105-111.
[4]战鹏.地铁杂散电流对钢筋混凝土结构腐蚀影响研究及防护[D].北京:北京交通大学,2009.
[5]李伟伟,张明义,白晓宇. GFRP与钢筋抗浮锚杆承载特性试验研究[J].地下空间与工程学报,2015,11(1):108-115.
[6]杨蒙,张彦忠,谭跃虎,等. GFRP锚杆在抗浮工程中的应用研究[J].四川建筑科学研究,2013,39(3):112-116.
[7]张宗强.新型复合材料抗浮锚杆承载特性现场试验研究[D].青岛:青岛理工大学,2012.
[8]张新越. FRP筋及其加筋混凝土梁桥体系的性能与设计研究[D].哈尔滨:哈尔滨工业大学,2006.
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[10]中华人民共和国国家质量监督检验检疫总局.结构工程用纤维增强复合材料筋:GB/T 26743—2011[S].北京:中国计划出版社,2012.
[11]陈智. GFRP土钉多尺度力学性能及锚固支护工程应用研究[D].武汉:华中科技大学,2016.
[12]中华人民共和国住房和城乡建设部.土木工程用玻璃纤维增强筋:JG/T 406-2013[S].北京:中国计划出版社,2013.
[13]张明义,白晓宇,李伟伟. GFRP抗浮锚杆螺母托盘锚具外锚固性能试验[J].中南大学学报(自然科学版),2016,47(1):239-247.
[14]李伟伟,张明义,白晓宇. GFRP抗浮锚杆外锚固试验研究及数值模拟[J].工程建设,2013,45(6):7-11.
[15]白晓宇,张明义,匡政,等.光纤光栅传感技术GFRP抗浮锚杆现场拉拔试验中的应用[J].岩土力学,2018,39(10):1-9.
[16]张舜泉.长期荷载作用下GFRP抗浮锚杆蠕变性能研究[D].青岛:青岛理工大学,2014.
[17]白晓宇. GFRP抗浮锚杆锚固机理试验研究与理论分析[D].青岛:青岛理工大学,2015.
[18]王洋,冯君,李珈瑶,等. FRP锚杆在岩土锚固中的研究进展[J].工程地质学报,2018,26(3):776-785.
[19]中华人民共和国住房和城乡建设部.建筑地下结构抗浮技术规范(网上征求意见稿)[S]. 2015.
[20]李伟伟,张明义,白晓宇,等. GFRP与钢筋抗浮锚杆承载特性试验研究[J].地下空间与工程学报,2015,11(1):108-115.
[21]朱磊. GFRP抗浮锚杆承载性能及变形特性试验研究[D].青岛:青岛理工大学,2016.
[22]朱磊,张明义,白晓宇,等. GFRP抗浮锚杆在基础底板中的锚固性能现场试验研究[J].土木建筑与环境工程,2017,39(2):107-115.
[23]李伟伟. GFRP抗浮锚杆外锚固试验研究及有限元模拟[D].青岛:青岛理工大学,2013.
[2]沈小克,周宏磊,王军辉,等.地下水与结构抗浮[M].北京:中国建筑工业出版社,2013.
[3]曾国机,王贤能,胡岱文.抗浮技术措施应用现状分析[J].地下空间,2004,24(1):105-111.
[4]战鹏.地铁杂散电流对钢筋混凝土结构腐蚀影响研究及防护[D].北京:北京交通大学,2009.
[5]李伟伟,张明义,白晓宇. GFRP与钢筋抗浮锚杆承载特性试验研究[J].地下空间与工程学报,2015,11(1):108-115.
[6]杨蒙,张彦忠,谭跃虎,等. GFRP锚杆在抗浮工程中的应用研究[J].四川建筑科学研究,2013,39(3):112-116.
[7]张宗强.新型复合材料抗浮锚杆承载特性现场试验研究[D].青岛:青岛理工大学,2012.
[8]张新越. FRP筋及其加筋混凝土梁桥体系的性能与设计研究[D].哈尔滨:哈尔滨工业大学,2006.
[9]中华人民共和国住房和城乡建设部.纤维增强复合材料:GB50608—2010[S].北京:中国计划出版社,2011.
[10]中华人民共和国国家质量监督检验检疫总局.结构工程用纤维增强复合材料筋:GB/T 26743—2011[S].北京:中国计划出版社,2012.
[11]陈智. GFRP土钉多尺度力学性能及锚固支护工程应用研究[D].武汉:华中科技大学,2016.
[12]中华人民共和国住房和城乡建设部.土木工程用玻璃纤维增强筋:JG/T 406-2013[S].北京:中国计划出版社,2013.
[13]张明义,白晓宇,李伟伟. GFRP抗浮锚杆螺母托盘锚具外锚固性能试验[J].中南大学学报(自然科学版),2016,47(1):239-247.
[14]李伟伟,张明义,白晓宇. GFRP抗浮锚杆外锚固试验研究及数值模拟[J].工程建设,2013,45(6):7-11.
[15]白晓宇,张明义,匡政,等.光纤光栅传感技术GFRP抗浮锚杆现场拉拔试验中的应用[J].岩土力学,2018,39(10):1-9.
[16]张舜泉.长期荷载作用下GFRP抗浮锚杆蠕变性能研究[D].青岛:青岛理工大学,2014.
[17]白晓宇. GFRP抗浮锚杆锚固机理试验研究与理论分析[D].青岛:青岛理工大学,2015.
[18]王洋,冯君,李珈瑶,等. FRP锚杆在岩土锚固中的研究进展[J].工程地质学报,2018,26(3):776-785.
[19]中华人民共和国住房和城乡建设部.建筑地下结构抗浮技术规范(网上征求意见稿)[S]. 2015.
[20]李伟伟,张明义,白晓宇,等. GFRP与钢筋抗浮锚杆承载特性试验研究[J].地下空间与工程学报,2015,11(1):108-115.
[21]朱磊. GFRP抗浮锚杆承载性能及变形特性试验研究[D].青岛:青岛理工大学,2016.
[22]朱磊,张明义,白晓宇,等. GFRP抗浮锚杆在基础底板中的锚固性能现场试验研究[J].土木建筑与环境工程,2017,39(2):107-115.
[23]李伟伟. GFRP抗浮锚杆外锚固试验研究及有限元模拟[D].青岛:青岛理工大学,2013.