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通过室内常规三轴试验(UU),研究了含水率对天水职院滑坡区马兰黄土的抗剪强度指标影响,以及不同含水率和围压下的应力应变关系。研究结果表明,粘聚力与含水率呈指数函数关系衰减,而内摩擦角呈二次函数关系衰减。当围压和初始含水率均较小时,黄土结构性明显,应力应变曲线呈软化型;当围压和初始含水率均较大时,黄土结构性不明显,曲线呈硬化型。研究成果对天水地区滑坡预测及防治有参考意义。
The effect of water content on the shear strength of Malan loess in Tiansuoyuan landslide and the relationship between stress and strain under different water content and confining pressure were studied by the indoor conventional triaxial test (UU). The results show that the cohesion and moisture content exponentially decay, while the internal friction angle decreases quadratically. When the confining pressure and the initial water content are both small, the loess structure is obvious and the stress-strain curve is softened. When the confining pressure and the initial water content are both large, the structure of the loess is not obvious and the curve is hardened. The research results have reference significance to landslide prediction and prevention in Tianshui area.