本文選題：隧道錨原位模型試驗　切入點：施力方式　出處：《地下空間與工程學(xué)報》2017年02期 　論文類型：期刊論文

【摘要】：介紹了隧道錨原位縮尺模型試驗兩種施力方法的原理及方法,剖析了不同施力方式對縮尺模型錨試驗的影響。縮尺后模型尺寸變小,前拉法的散索難以可靠實施,直接影響拉撥效果,同時,拉撥中需要設(shè)置巨大的反力梁,不僅大大增加試驗成本,而且對圍巖變形測量影響大。為此研究了一種替代方法——后推法。以實例為基礎(chǔ)剖析了前拉法的優(yōu)缺點,介紹了后推法的原理、方法及實施要點,并以重慶幾江長江大橋為例,采用有限差分法對模型錨不同施力方式作用后的塑性區(qū)分布、變形特征及破壞特征進行了比較分析,兩種施力方法作用于模型錨后的塑性區(qū)分布和變形分布上有細微差別,通過重慶幾江長江大橋1∶10縮尺模型試驗驗證,其破壞模式基本吻合,表明后推法可以替代前拉法。目前該方法得到了推廣應(yīng)用。
[Abstract]:This paper introduces the principle and method of two kinds of force applying methods for in-situ scaling model test of tunnel anchor, and analyzes the influence of different force modes on anchor test of scale model. The model size becomes smaller after scaling and the loose cable of forward pulling method is difficult to carry out reliably. At the same time, it is necessary to set up a huge reaction beam in the drawing, which not only increases the test cost, but also increases the test cost. And it has a great influence on the measurement of surrounding rock deformation. In this paper, an alternative method, the backward pushing method, is studied. Based on an example, the advantages and disadvantages of the forward pull method are analyzed, and the principle, method and key points of the backward push method are introduced. The Chongqing Jijiang River and Yangtze River Bridge is taken as an example. The plastic zone distribution, deformation characteristics and failure characteristics of the model anchor are compared and analyzed by using the finite difference method. There are slight differences between the plastic zone distribution and the deformation distribution after the model anchor is applied by the two methods. Through the 1:10 scale model test of Chongqing Jijiang and Yangtze River Bridge, the failure mode is basically consistent, which indicates that the backward push method can replace the forward pull method. At present, this method has been popularized and applied.
【作者單位】： 長江水利委員會長江科學(xué)院重慶分院;
【基金】：國家青年科學(xué)基金(51409013)
【分類號】：U448.25

【相似文獻】

相關(guān)期刊論文 前1條

1 侯俊明,劉贊勛,宋一凡,賀栓海;海珠大橋加固施力測試研究[J];西安公路交通大學(xué)學(xué)報;1997年03期

，

本文編號：1596831