常/變法向應(yīng)力作用下密砂-混凝土接觸面剪切力學(xué)性狀試驗(yàn)研究*
曹衛(wèi)平1，陸清元1，梁鵬2
- 摘 要
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（1 西安建筑科技大學(xué)土木工程學(xué)院，西安 710055；2 中鐵一院集團(tuán)山東建筑設(shè)計(jì)院有限公司，威海 264299)［摘要］通過大型直剪儀對(duì)密砂-混凝土接觸面進(jìn)行了常法向應(yīng)力和變法向應(yīng)力作用下的剪切試驗(yàn)，分析了剪切面剪應(yīng)力和體應(yīng)變的變化特征，建立了密砂-混凝土接觸面剪切的數(shù)學(xué)模型。結(jié)果表明：在常法向應(yīng)力剪切試驗(yàn)中，密砂-混凝土接觸面的抗剪強(qiáng)度符合摩爾庫(kù)倫定律，抗剪殘余強(qiáng)度與法向應(yīng)力之間成直線關(guān)系，體應(yīng)變與法向應(yīng)力密切相關(guān)；在變法向應(yīng)力剪切試驗(yàn)中第二級(jí)法向應(yīng)力作用下，密砂-混凝土接觸面的剪應(yīng)力最大值與相應(yīng)的常法向應(yīng)力作用下的抗剪殘余強(qiáng)度相同，但其體應(yīng)變比相應(yīng)常法向應(yīng)力作用下的體應(yīng)變小。在常法向應(yīng)力作用下，密砂-混凝土接觸面的剪應(yīng)力-剪切位移關(guān)系曲線可用三折線擬合；在變法向應(yīng)力作用下，密砂-混凝土接觸面的剪應(yīng)力-剪切位移關(guān)系曲線可用三折線雙曲線擬合。［關(guān)鍵詞］密砂-混凝土接觸面; 大型直剪試驗(yàn); 剪應(yīng)力; 體應(yīng)變; 剪切位移中圖分類號(hào)：TU43，TU411 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)01-0082-05Experimental study on shear mechanical properties on dense sand-concrete interface under constant and varying normal stressCao Weiping1, Lu Qingyuan1, Liang Peng2（1 College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2 Shandong Institute of Architectural Design Co., Ltd. of China Railway First Design Institute Group, Weihai 264299, China）Abstract: A series of large-scale direct shear tests of dense sand-concrete interface under constant and varying normal stress were carried out by using large-scale direct shear apparatus to analyze the characteristics of shear stress and volumetric strain and mathematical models of dense sand-concrete interface were established. The results show that in the constant normal stress-shear tests, the shear strength of dense sand-concrete interface satisfies the Mohr-Coulomb criterion, the relationship between residual strength and normal stress is linear, and the volumetric strain is closely related to the normal stress. Under the second order normal stress of the varying normal stress-shear tests, the maximum shear stress is identical to the residual strength under the constant normal stress but the volumetric strain is smaller. The relationship between the shear stress and the shear displacement under the constant normal stress can be fitted with the tri-linear, and the relation ship between them under the varying normal stress can be fitted with the tri-linearhyperbolic curve.Keywords: dense sand-concrete interface; large-scale direct shear test; shear stress; volumetric strain; shear displacement*國(guó)家自然科學(xué)基金(51078308)。作者簡(jiǎn)介：曹衛(wèi)平，博士，教授，Email：caowp@xauat.edu.cn。參考文獻(xiàn)［1］張冬霽，盧廷浩. 一種土與結(jié)構(gòu)接觸面模型的建立及其應(yīng)用［J］. 巖土工程學(xué)報(bào)，1998，20(6)：62-66.［2］張嘎，張建民. 粗粒土與結(jié)構(gòu)接觸面單調(diào)力學(xué)特性的試驗(yàn)研究［J］. 巖土工程學(xué)報(bào)，2004，26(1)：21-25.［3］張嘎，張建民. 循環(huán)荷載作用下粗粒土與結(jié)構(gòu)接觸面變形特性的試驗(yàn)研究［J］. 巖土工程學(xué)報(bào)，2004，26(2)：254-258.［4］張嘎，張建民. 夾有泥皮粗粒土與結(jié)構(gòu)接觸面力學(xué)特性試驗(yàn)研究［J］. 巖土力學(xué)，2005，26(9)：1374-1378.［5］劉方成，尚守平，王東海. 粉質(zhì)黏土-混凝土接觸面特性單剪試驗(yàn)研究［J］. 巖石力學(xué)與工程學(xué)報(bào)，2011，30(8)：1720-1728.［6］ALONSO E E，JOSA A, LEDESMA A. Negative skin friction on piles: a simplified analysis and prediction procedure［J］. Geotechnique, 1984，34(3)：341-357.［7］FAKHARIAN K, EVGIN E. Cyclic simple-shear behavior of sand-steel interfaces under constant normal stiffness condition［J］. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 1997, 123(12)：1096-1105.［8］TIWARI B, AJMERA B，KAYA G. Shear strength reduction at soil structure interface［C］// GeoFlorida 2010:Advances in Analysis，Modeling & Design（GSP199）. ASCE，2010：1747-1756.［9］梁鵬，曹衛(wèi)平，陸清元. 常/變法向應(yīng)力下松砂-混凝土接觸面剪切力學(xué)性狀試驗(yàn)研究［J］. 建筑結(jié)構(gòu)，2014，44(8):61-65.
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