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本文根据小浪底项目组中美联合设计组提出的要求,选用小浪底筑坝土料中具有代表性的重粉质壤土和中粉质壤土,进行非饱和土三轴UU非线性弹性参数和反复荷载模量K_(ur)测定,为小浪底大坝稳定分析提供了所需的计算参数。还进一步探讨了湿度对反复模量K_(ur)的影响,在周压力σ_3=29.4MPa下,试样中含水量增加3—4％的中粉质壤土、重粉质壤土模最E_(ur)分别降低20—51％。
Based on the requirements put forward by the Sino-US Joint Design Team of the Xiaolangdi Project Group, this paper selects representative heavy silt soils and medium silty loam soils from the Xiaolangdi dam earthwork for the triaxial UU nonlinear elastic parameters and repeated load modelling of unsaturated soils. The determination of K_(ur) provides the necessary calculation parameters for the stability analysis of Xiaolangdi Dam. The influence of humidity on the repeated modulus K_(ur) was further discussed. Under the weekly pressure σ_3=29.4 MPa, the moisture content in the sample increased by 3 to 4% in the medium silty loam soil and heavy silt soil model E_(ur). ) Reducing 20-51% respectively.