1.广州环保投资集团有限公司;2.上海大学/ 力学与工程科学学院;3.上海大学/力学与工程科学学院;4.广州环投增城环保能源有限公司
国家自然科学基金资助项目(52078285,51878402)
- Zhou Weidong 1
- CHEN Shuqi 2
- Liu Feiyu 3
- LIU Hongbo 4
1.Guangzhou Environmental Protection Investment Group Co., Ltd.;2.Shanghai University/ School of Mechanics and Engineering Science;3.Shanghai University/School of Mechanics and Engineering Science;4.GZEPI Zhengcheng Environmental Protection Energy Co., Ltd.
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含水率对土工格栅加筋的花岗岩残积土力学特性影响较大，为研究不同含水率下花岗岩残积土-格栅界面循环剪切特性，通过室内大型直剪仪开展了一系列循环剪切试验，分析了4种含水率（13%、19%、25%、32%）、3种竖向应力（50、100、150kPa）、4种剪切频率（0.2、0.5、1、2Hz）和4种剪切幅值（5、10、15、20mm）条件下筋土界面的剪应力-剪切位移曲线、抗剪强度、剪切刚度、体积应变等。试验结果表明:含水率为32%时土体饱和，筋土界面峰值剪应力和剪切刚度在循环剪切过程中先增加后降低，50、100、150kPa竖向应力作用下峰值剪应力初始增幅分别为6.2%、22.3%、33.0%，表明竖向应力越大筋土界面初期增幅越大，而非饱和含水率下筋土界面呈现剪切软化特征；竖向应力为50kPa时，筋土界面在含水率为25%时达到抗剪强度峰值，竖向应力为100kPa、150kPa时，筋土界面循环抗剪强度与含水率呈负相关，降幅为35.47%、43.17%；筋土界面在循环剪切作用下发生剪缩，含水率为13%、19%、25%、32%时筋土界面最终剪缩量分别为4.6、7.7、8.6、7.2mm，表明剪缩量随着含水率的升高先增大后减小；各含水率下，筋土界面最大剪切刚度随剪切频率的升高先降低后增大，随剪切幅值的增大而减小，0.5Hz的剪切频率对筋土界面剪切刚度弱化作用最强。
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 different water content, a series of cyclic shear tests were carried out by large indoor direct shear apparatus. The shear stress-shear displacement curves, shear strength, shear stiffness and volume of the soil-reinforced interface were analyzed under four kinds of water content (13%, 19%, 25%, 32%), three kinds of normal stress (50, 100, 150kPa), four kinds of shear frequency (0.2, 0.5, 1, 2Hz) and four kinds of shear amplitude (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 stiffness 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 50, 100 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. Under unsaturated water content, the interface of soil-reinforced soil shows shear softening characteristics. When the normal stress is 50kPa, the shear strength of the interface reaches the peak value when the water content is 25%. When the normal stress is 100kPa and 150kPa, the cyclic shear strength of the interface is negatively correlated with the water content, decreasing by 35.47% and 43.17%. 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 the increase of 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.
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- 收稿日期:2023-02-03
- 最后修改日期:2023-04-16
- 录用日期:2023-04-21
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