- 摘 要
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(武漢市勘察設(shè)計有限公司， 武漢 430022)
［摘要］介紹了一種新型大直徑全粘結(jié)型錨索即高壓旋噴玻纖筋錨索的結(jié)構(gòu)、特點及成錨機理。以武漢市某深基坑工程為例，通過現(xiàn)場抗拔試驗及支護結(jié)構(gòu)變形監(jiān)測，對高壓旋噴玻纖筋錨索的適用性、安全性及破壞模式等進行了研究。結(jié)果表明：高壓旋噴玻纖筋錨索用于存在一定厚度填土層的地層時，承載力可以滿足設(shè)計要求，從而解決基坑支護工程中采用普通錨桿長度過長的問題；高壓旋噴玻纖筋錨索的破壞過程可分為彈性變形、彈塑性變形、塑性變形三個階段。在彈性變形、彈塑性變形、塑性變形階段的荷載-位移曲線分別呈線性、二次函數(shù)型、指數(shù)型。高壓旋噴玻纖筋錨索的界面抗剪剛度是限制其使用的一個重要因素。
［關(guān)鍵詞］基坑支護；樁錨支護；高壓旋噴玻纖筋錨索；錨桿抗拔試驗
中圖分類號：TU753 文獻標(biāo)識碼：A文章編號：1002-848X(2021)20-0135-05
Application of high-pressure jet grouting anchor cable with GFRP in foundation pit support engineering
FU Zhengfei, CAI Jiaojiao, LIU Xinyu
(Wuhan Geotechnical Engineering and Surveying Co., Ltd., Wuhan 430022，China)
Abstract: The structure, characteristics and anchoring mechanism of a new type large-diameter fully bonded anchor cable, namely high-pressure jet grouting anchor cable with glass fiber reinforced polymer (GFRP) were introduced. Taking a deep foundation pit project in Wuhan as an example, the applicability, safety and failure mode of the high-pressure jet grouting anchor cable with GFRP were studied through on-site pull-out tests and deformation monitoring of support structure. The results show that when the high-pressure jet grouting anchor cable with GFRP is used in the stratum with a certain thickness of the fill layer, its bearing capacity can meet the design requirements, so as to solve the problem of the excessive length of the ordinary anchor rod in the foundation pit support project. The failure process of the high-pressure jet grouting anchor cable with GFRP can be divided into three stages: elastic deformation, elastic-plastic deformation and plastic deformation. The load-displacement curves of elastic deformation，elastic-plastic deformation and plastic deformation stage are linear, quadratic function type and exponential type respectively. The interface shear stiffness of the high-pressure jet grouting anchor cable with GFRP is an important factor limiting its use.
Keywords:foundation pit support； pile-anchor retaining support； high-pressure jet grouting anchor cable with glass fiber reinforced polymer；pull-out test of anchor
作者簡介：付正飛，碩士，高級工程師，Email:18624259@qq.com;通信作者：蔡嬌嬌，碩士，Email:1342201811@qq.com。
