CAJ | 학술논문

抗浮锚杆作为一种竖向锚固技术在我国许多地区广泛应用，锚杆作为抗浮结构的核心其性能受到极大关注。但因钢材易腐蚀，传统金属锚杆的耐久性受到质疑，特别是地铁等地下工程存在杂散电流，限制了金属抗浮锚杆的应用。玻璃纤维增强聚合物（GFRP）抗浮锚杆是一种由树脂基体和玻璃纤维复合而成的新材料，与金属锚杆相比，它具有耐腐蚀、抗拉强度高、自重轻等优良特性。通过植入式裸光纤传感测试技术对GFRP抗浮锚杆的界面应力分布、荷载传递规律及破坏机制进行了研究，论证了GFRP抗浮锚杆使用的适宜性。试验表明，GFRP抗浮锚杆破坏以杆体基体材料剪切破坏为主，?28 mm锚杆极限抗拔力为250 kN，能够满足工程需要；杆体轴力沿深度方向逐渐递减，并且超过一定长度后杆体不再受力。结果显示，中风化岩地区，当锚固段长度为3.95～6.95 m时，轴力影响深度范围约为3.7 m，说明GFRP抗浮锚杆同样存在临界锚固深度问题。锚杆界面剪应力呈不均匀分布，剪应力峰值随荷载的增加逐渐向下转移，同时0值点也向杆体深部转移。研究成果可为GFRP抗浮锚杆应用于工程实际提供依据。
항부묘간작위일충수향묘고기술재아국허다지구엄범응용，묘간작위항부결구적핵심기성능수도겁대관주。단인강재역부식，전통금속묘간적내구성수도질의，특별시지철등지하공정존재잡산전류，한제료금속항부묘간적응용。파리섬유증강취합물（GFRP）항부묘간시일충유수지기체화파리섬유복합이성적신재료，여금속묘간상비，타구유내부식、항랍강도고、자중경등우량특성。통과식입식라광섬전감측시기술대GFRP항부묘간적계면응력분포、하재전체규률급파배궤제진행료연구，론증료GFRP항부묘간사용적괄의성。시험표명，GFRP항부묘간파배이간체기체재료전절파배위주，?28 mm묘간겁한항발력위250 kN，능구만족공정수요；간체축력연심도방향축점체감，병차초과일정장도후간체불재수력。결과현시，중풍화암지구，당묘고단장도위3.95～6.95 m시，축력영향심도범위약위3.7 m，설명GFRP항부묘간동양존재림계묘고심도문제。묘간계면전응력정불균균분포，전응력봉치수하재적증가축점향하전이，동시0치점야향간체심부전이。연구성과가위GFRP항부묘간응용우공정실제제공의거。
As a kind of vertical anchoring technique, the anti-float anchor has been widely used in China, whose performance has begun to receive more attentions from researchers. However, steels may be eroded easily by groundwater or chemical solutions, which will cause the reductions of mechanical strength and service life, especially in subway engineering the steel anti-float anchor is forbidden. Glass fiber reinforced polymer (GFRP) anti-float anchor is a new kind of material which is composed of resin matrix and glass fiber. Compared with steel anchor, the GFRP anti-float anchor has higher strength, corrosion-resistance and light weight behavior. The field tests show the feasibility of GFRP anti-float anchor through embedded bare fiber optics sensor technique. According to the test results, the GFRP anti-float anchor stress-strain behaviors, load transfer mechanism and failure mechanism are considered. The test indicates that GFRP anti-float anchor is basically about shear failure and pullout capacity of anchors with?28 mm are 250 kN, which can be satisfied with engineering demands. The axial forces of anchors fall gradually with depth, and it will not bear load beyond certain length. Results show that the effect distance of axial forces is about 3.7 m when the length of bond part is in range of 3.95~6.95 m in moderately weathered granite,which indicates that GFRP anti-float anchors also exist critical anchorage depth. The shear stress on interface of anchor is not evenly distributed, which peak value is being driven down, and so as to the zero value. The research results can provide evidence for application of GFRP anti-float anchor.