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中文摘要：
室内直剪试验应用较为广泛,但其试验过程以及结果处理存在一定的局限性.运用国际大型岩土工程数值计算软件FLAC3D,以室内大型剪切试验为依据,建立直剪试验三维数值模型,进而直观展现了碎石土试样内部的随着剪切推动的应力变化规律,并对比有无考虑了剪切盒侧壁摩擦力的情况.结果表明：随着剪切过程的进行,剪切应力刚开始随着剪切位移增加而急剧爬升达到“峰值”（试样破坏）逐步趋于稳定；剪应力云图由最初的“耳状”以剪切面为核心向周围扩展；剪切盒侧壁摩擦力对测试结果的影响不容忽视.直剪试验三维数值模拟研究是对室内直剪试验的一个有效补充.
英文摘要：
Indoor direct shear test is applied more widely,but the test process and results processing have certain limitation.The direct shear test 3-dimensional numerical model is established by international large geotechnical engineering numerical calculation software FLAC3D,and based on large shear test data The model can lead to intuitive understanding internal rule of shearing stress and strain,By the model we research the shear box wall friction.The results show that,with the shear process,shear stress increases sharply at beginning,and then climbs to ＂ peak＂（sample destruction） with the shear displacement,and at last gradually becomes stable.Shear stress nephogram is expanded from the initial ＂auricular＂ to around as the shear plane core.The test results of the shear box wall friction impact cannot be overlooked.3-dimensional direct shear test numerical simulation research is an effective supplement for indoor direct shear test.
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