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充气锚杆在砂土中的模型试验研究 被引量:10

Model test study of inflated anchors in sands
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摘要 为探讨充气锚杆的承载特性,通过建立室内试验模型,改变锚杆充气压力大小、埋设深度、土体密度、橡胶膜长度、厚度等条件,进行了一系列的抗拔试验,得到相应的荷载一位移曲线。研究结果表明:在影响充气锚杆抗拔承载力的诸多因素中,充气压力及土体密实度与承载力成一定倍数增长关系,是最显著的影响因素;其次是橡胶膜长度,成显著线性增长关系;充气锚杆的极限位移主要来自橡胶膜的弹塑性变形,反映了充气锚杆在抗拔过程中橡胶膜的力学行为;通过与常用锚杆的对比分析,得出充气锚杆的极限抗拔承载能力约是单锚片螺旋锚的413倍,是双锚片螺旋锚的1.9倍,其极限侧阻力约为一般注浆扩大头锚杆的2~4倍。 In order to investigate the bearing features of inflated anchors, a series of scaled physical model tests are done in a calibration chamber using dry sands and anchors of various inflation pressures, embedment depths, soil densities, membrane lengths and thicknesses; and the relevant load-displacement curves are obtained. The results show that the inflation pressure, soil density and anchor length are the dominant factors affecting the pullout capacity of the inflated anchor system in sands. The utmost displacement of inflated anchor is mainly from the elastoplastic deformation of the membrane, which reflects the mechanical properties of the membrane during the pullout test. By contrastive analysis with common anchors, it is indicated that the limit tensile load of inflated anchor is 4.3 times of that of the single-blade screw anchor, 1.9 times of that of the double-blade screw anchor. And its ultimate lateral resistance is 2 to 4 times of that of common anchors.
作者 曹佳文 彭振斌 彭文祥 何忠明 尹泉 CAO Jia-wen, PENG Zhen-bin, PENG Wen-xiang, HE Zhong-ming, YIN Quan( 1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, China)
出处 《岩土力学》 EI CSCD 北大核心 2011年第7期1957-1962,共6页 Rock and Soil Mechanics
基金 国家自然科学基金资助项目(No.50878212).
关键词 充气锚杆 抗拔试验 极限承载力 橡胶膜 位移 inflated anchor pullout test limit load membrane displacement
作者简介 第一作者简介:曹佳文,男,1979年生,博士研究生,工程师,主要从事岩土工程方面的研究。E—mail:caoao@163.com
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参考文献15

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