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粘粒含量较少的轻、中粉质壤土作冲填土料修建水坠坝，在黄土高原地区已被广泛应用。重粉质壤土作为冲填土料，由于其渗透系数小，脱水固结速度慢，施工期易形成滑坡。对于冲填泥浆，由于在实验室不易控制，且变形较大，其抗剪强度指标的实验室测定目前还是困难的。本文通过对彭阳县槐沟水力冲填坝的滑动破坏分析，得到平均粘粒含量２６．３％、含水量在２２％～２８％范围的冲填体抗剪强度指标的方程式。该方程式可为相近冲填体实验室测定的抗剪强度指标的分析、选择及其经验值确定提供依据。结合槐沟水力冲填坝的施工情况，在重粉质壤土地区修筑较高的土坝，采用水力冲填法施工的经济合宜性还有待进一步探讨。
The light and medium silty loam with less clay content is used to construct the water crashed dam, which is widely used in the Loess Plateau. Heavy silty loam as red fill material, due to its low permeability coefficient, slow dehydration and consolidation, easy to form landslides during construction. For the red mud filling, due to the laboratory is not easy to control, and large deformation, the laboratory determination of shear strength index is still difficult. Based on the analysis of the sliding failure of Huaiogou hydraulic impounding dam in Pengyang County, the equation of shear strength index of the impoundment with the average clay content of 26.3% and the water content of 22% ~ 28% is obtained. The equation can provide the basis for the analysis and selection of the shear strength index and the determination of the empirical value of the laboratory of similar filling bodies. Combined with the construction of the Huai Gou Hydraulic Recirculation Dam, the construction of a high earth dam in the heavy silty loam area requires further discussion on the economic suitability of the construction by hydraulic impulse filling.