不同含水率花崗巖殘積土-格柵界面的循環(huán)剪切特性

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中圖分類號(hào)：TU411.7 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：2096-6717（2025）03-0058-08

Cyclic shear characteristics of granite residual soil-geogrid interface with different water contents

ZHOUWeidong1，CHENShuqi2，LIUFeiyu2，LIUHongbo3 （1.Guangzhou Environmental Protection Investment Group Co.，Ltd.，Guangzhou 5lo33o，P.R.China; 2. Department of Civil Engineering，Shanghai University， Shanghai2OO444，P.R. China; 3. GZEPI Zengcheng Environmental Protection EnergyCo.，Ltd.，Guangzhou5ll3oo，P.R.China）

Abstract：Water content has a great influence on the mechanical properties of granite residual soil reinforced with geogrids. In order to study the cyclic shear characteristics of granite residual soil-geogrid interface under diferent water contents，a series of cyclic shear tests were carried out by large-scale indoor direct shear apparatus.The shear stress-shear displacement curves，shear strength，shear stiffess and volume of the soilreinforced interface were analyzed under four values of water content （ 13% ， 19% ， 25% ， 32% ），three values of normal stress （50，100， 150kPa ），four shear frequencies（O.2，O.5，1， 2Hz ）and four shear amplitudes （5，10， 15， 20mm ）.The test results show that：When the soil is saturated with water content of 32% ，the peak shear stress and shear stifness of the interface increase first and then decrease during the cyclic shearing process. The initial increase of the peak shear stress under the normal stress of 5O，1OO and 150kPa is 6.2% ， 22.3% and 33.0% ，respectively，indicating that the increase of the normal stress is greater than that of the interface at the initial stage.The interface of soil-reinforced unsaturated soil shows shear softening characteristics.Under different normal stresses，the cyclic shear strength of the interface is negatively correlated with the water content. When the water content is 13% ， 19% ， 25% and 32% ，the final shear shrinkage of the interface is 4.6， 7.7，8.6 and 7.2mm ，respectively，indicating that the shear shrinkage increases first and then decreases with Water content.At each water content，the maximum shear stiffness of the interface decreases first and then increases with the increase of shear frequency，and decreases with the increase of shear amplitude.The shear frequency of 0.5Hz has the strongest weakening effect on the interface shear stiffness of the interface.

Keywords： reinforced soil interface；water content；granitic residual soil; cyclic shearing;shear stiffness

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