CAJ | 학술논문

充气锚杆是一种全新概念的新型锚杆,它是充分利用软土在压力作用下可产生挤压变形的特性研发而成的.本文论述了充气锚杆的独有特点,对充气锚杆的研究现状、锚杆荷载传递机制,以及岩土锚固机制进行了论述.总结了充气锚杆的一些规律:①充气锚杆的抗拔承载力主要与砂的密实度、软土的液限指数、锚杆长度、充气压力大小、橡胶膜的厚度、橡胶膜外表的粗糙度、充气扩大头体积、锚杆埋设深度等因素有关,其中,锚杆长度是最主要的影响因素;②充气锚杆的极限抗拔承载力是螺旋锚杆的4倍,在软土的排水与不排水对比试验中,充气锚杆极限抗拔承载力相差3～4倍;③在充气压力一定时,不同土体,锚杆的抗拔承载力差别很大,短锚杆100mm时几乎全长受力,长锚杆200～300mm时只在锚杆充气段上部分受力.
충기묘간시일충전신개념적신형묘간,타시충분이용연토재압력작용하가산생제압변형적특성연발이성적.본문논술료충기묘간적독유특점,대충기묘간적연구현상、묘간하재전체궤제,이급암토묘고궤제진행료논술.총결료충기묘간적일사규률:①충기묘간적항발승재력주요여사적밀실도、연토적액한지수、묘간장도、충기압력대소、상효막적후도、상효막외표적조조도、충기확대두체적、묘간매설심도등인소유관,기중,묘간장도시최주요적영향인소;②충기묘간적겁한항발승재력시라선묘간적4배,재연토적배수여불배수대비시험중,충기묘간겁한항발승재력상차3～4배;③재충기압력일정시,불동토체,묘간적항발승재력차별흔대,단묘간100mm시궤호전장수력,장묘간200～300mm시지재묘간충기단상부분수력.
Inflatable anchor is a new type of anchor,developed based on the soil-anchor characteristics.Under compressive loading,the soft soil will be greatly deformed.Inflatable anchor makes a full use of this feature of soft soil.This paper discusses the characteristics of inflatable anchor and reviews the present state of development of inflatable anchor,the mechanism of load transferring and the anchoring mechanism.It is shown that the limit tensile load of inflatable anchor is related to many factors,including soil density,soft soil liquidity index,anchor length,inflatable air pressure,rubber thickness,rubber fiction,air inflatable volume and the anchoring depth.Among those factors,the anchor length is the most important.The limit tensile load of inflatable anchor is 4 times of that of helical plate anchor.The limit tensile load in the drainage test is 3～4 times of that in undrainage test.If the air pressure is constant,the limit tensile load varies greatly in different soils.The shon anchor(about 100mm in length)will be loaded along the whole shaft.The long anchor(about 300mm in length)will be loaded only in the inflatable part.