本文關(guān)鍵詞： 平面應(yīng)變儀 新型壓力室 土樣與面板的摩擦 數(shù)字圖像測量　出處：《巖土力學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：現(xiàn)有的平面應(yīng)變試驗儀都不能很好地解決接觸摩擦的問題,試驗中土樣與約束面板之間存在較大的摩擦力影響變形測量的準(zhǔn)確性。在總結(jié)平面應(yīng)變儀發(fā)展歷程的基礎(chǔ)上,根據(jù)加載方式將平面應(yīng)變儀分為4類,分析了現(xiàn)有的平面應(yīng)變試驗儀的特點和存在的問題;介紹了一種改進的平面應(yīng)變儀的壓力室。改進后的壓力室在前、后約束面板與土樣之間分別增設(shè)一層厚約3 mm的密封水膜。在試驗過程中,包裹土樣的橡皮膜與密封水膜的硅膠膜緊密貼合而不直接與面板貼合,可以消除土樣與面板之間的摩擦。同時,新型的壓力室還可應(yīng)用于土樣變形數(shù)字圖像測量系統(tǒng),實時測量土樣表面的變形分布,可以比較精確地測量土樣的表面變形、剪切帶的形成過程及特征。分別使用改進的壓力室和未改進的壓力室對福建標(biāo)準(zhǔn)砂進行平面應(yīng)變試驗,前者測得的應(yīng)力-應(yīng)變關(guān)系曲線的峰值比后者低約60%。制備相同干密度的土樣分別進行不同圍壓條件下的三軸試驗和平面應(yīng)變試驗測取土樣的抗剪強度,使用改進壓力室得到的抗剪強度參數(shù)與三軸試驗測得的結(jié)果很接近,而使用未改進的壓力室測得結(jié)果則明顯不合理。
[Abstract]:The problems of contact friction can not be solved very well by the existing plane strain test instruments. The accuracy of deformation measurement is affected by the friction between the soil sample and the restrained panel. Based on the summary of the development history of the plane strain gauge, According to the loading mode, the plane strain gauge is divided into four categories, the characteristics and existing problems of the existing plane strain tester are analyzed, and the pressure chamber of an improved plane strain gauge is introduced. A sealed water film of about 3 mm thick is added between the rear confined panel and the soil sample. During the test, the rubber film wrapped in the soil sample is tightly bonded with the silica gel film of the sealed water film, but not directly attached to the panel. At the same time, the new pressure chamber can be used in the digital image measuring system of soil sample deformation, which can measure the deformation distribution of soil sample surface in real time, and can measure the surface deformation of soil sample more accurately. The formation process and characteristics of shear zone. The plane strain tests of Fujian standard sand were carried out by using the improved pressure chamber and the unimproved pressure chamber, respectively. The peak value of stress-strain curve measured by the former is about 60% lower than that of the latter. Soil samples with the same dry density are prepared to conduct triaxial tests under different confining pressures and plane strain tests to measure the shear strength of soil samples. The shear strength parameters obtained by using the improved pressure chamber are very close to the results obtained by triaxial test, but the results obtained by using the unimproved pressure chamber are obviously unreasonable.
【作者單位】： 大連理工大學(xué)工程力學(xué)系;大連理工大學(xué)工業(yè)裝備結(jié)構(gòu)分析國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(No.51309047)~~
【分類號】：TU415

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