- 摘 要
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（西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）
［摘要］利用Shear Trac-Ⅲ大型直剪儀對松砂-混凝土接觸面進(jìn)行了常/變法向應(yīng)力作用下的剪切試驗，分析了剪切過程中剪應(yīng)力和剪切面體應(yīng)變的變化特征，建立了能夠反映松砂-混凝土接觸面剪切力學(xué)性狀的數(shù)學(xué)模型，并給出了模型參數(shù)的確定方法。試驗結(jié)果表明：在常法向應(yīng)力作用下的剪切試驗中，松砂-混凝土接觸面的剪應(yīng)力及體應(yīng)變與法向應(yīng)力密切相關(guān)；在變法向應(yīng)力作用下的剪切試驗中，松砂-混凝土接觸面的抗剪強(qiáng)度與相應(yīng)的常法向應(yīng)力的抗剪強(qiáng)度相同，但其體應(yīng)變小于相應(yīng)的常法向應(yīng)力作用下的體應(yīng)變；在常法向應(yīng)力作用下，松砂-混凝土接觸面的剪應(yīng)力-剪切位移關(guān)系可以用雙曲線模型表示；在變法向應(yīng)力作用下，松砂-混凝土接觸面的剪應(yīng)力-剪切位移關(guān)系可以用分段雙曲線模型表示。
［關(guān)鍵詞］常法向應(yīng)力; 變法向應(yīng)力; 松砂-混凝土接觸面; 剪切性狀; 大型剪切試驗; 數(shù)學(xué)模型
中圖分類號：TU43,TU411 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)08-0061-05
Experimental research on shear properties of loose sand-concrete interface under constant/varying normal stress
Liang Peng, Cao Weiping, Lu Qingyuan
（College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China）
Abstract: A series of shear tests of loose sand-concrete interface under constant/varying normal stress were carried out by using Shear Trac-Ⅲ large direct shear apparatus. The characteristics of shear stress and volumetric strain were analyzed, and some mathematical models were developed to reflect the shear mechanical properties of loose sand-concrete interface. In addition, the determine method of model parameters was provided. It is concluded that the shear strength and the volumetric strain of loose sand-concrete interface are closely related to the normal stress in the constant normal stress-shear tests. In the varying normal stress-shear tests, the shear strength is identical to that of the constant normal stress, but the volumetric strain is smaller. Based on the test data, the relationship between the shear stress and the shear displacement under the constant normal stress can be fitted with the hyperbolic curve; and the relation between them under the varying normal stress can be fitted with the piecewise hyperbolic curve.
Keywords: constant normal stress; varying normal stress; loose sand-concrete interface; shear property; large-scale shear test; mathematical model
*國家自然科學(xué)基金(51078308)。
作者簡介：梁鵬，碩士研究生，Email: laparch@126.com。
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