槐沟水力冲填坝滑坡分析及冲填体抗剪强度指标的探讨

Analysis on Land Slides of Huaigou Hydraulic Fill Earth Dam and Study on Indexes of Shearing Strength of Filled Earth Body

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。

Light loam and medium loam with less clay particles as fill earth had been extensively used in the construction of hydraulic fill dam in the Loess Plateau region.If using weight loam as fill earth,because its penetration coefficient is low,the dewatering and consolidating velocity is slow,so land slide easily happens in construction period.As for muddy,because it deforms easily and is difficult to be controlled in the laborary,so at present the observation of the index of shearing strength in the laborary is difficult too.Through analysing land slide destruction of Huaigou hydraulic fill earth dam in Pengyang County,the paper gives out the equation about the indexes of shearing strength of fill earth body with 26.3% of average clay particle content,22% to 28% of water content.The equation can provide basis for analysis and selection of index of shearing strength of similar fill earth body surveyed in the laborary and determination of its experienced value.In the weight loam area,the economic feasibility of constructing higher dam by hydraulic fill method needs to be discussed in future.