水位升降过程中崩解预处理炭质泥岩路堤稳定性分析

发布时间：2018-10-16 15:24

【摘要】：为了研究水位升降期间炭质泥岩路堤稳定性,在探讨路堤稳定性影响因素的基础上,结合渗流及稳定性分析基本理论,提出了一种能同时考虑坡前水位压力、孔隙水压力、孔隙水重力、渗透力、软化、非饱和强度的路堤稳定性分析方法,并基于该方法对水位升降过程中炭质泥岩路堤渗流特性及稳定性进行了计算。研究结果表明:提出的路堤稳定性评价方法具有较强的适用性和针对性,能够综合评价多因素影响下炭质泥岩路堤稳定性;水位上升期及高水位恒定期,路堤内部地下水位、孔隙水压力、饱和度均逐渐升高,孔隙水压力升高幅度与高程成反比,饱和度升高幅度与高程成正比,水平向内、竖直向下的渗透力及其峰值、水平向内的位移均先增大,后减小,竖直向上的位移不断增大;水位下降期及低水位恒定期,路堤内部地下水位、孔隙水压力、饱和度均逐渐降低,孔隙水压力降低幅度与高程成反比,饱和度降低幅度与高程成正比,水平向外的渗透力及其峰值、水平向外与竖直向下的位移、塑性应变区面积均先增大、后减小,竖直向下的渗透力呈""形分布。研究成果对库、河岸地区炭质泥岩路堤的修筑及稳定性的控制具有一定的参考意义。
[Abstract]:In order to study the stability of carbonaceous mudstone embankment during water level rise and fall, on the basis of discussing the influencing factors of embankment stability, combined with the basic theory of seepage flow and stability analysis, a new kind of embankment can consider the water level pressure and pore water pressure at the same time. The stability analysis method of embankment with pore water gravity, permeability, softening and unsaturated strength is presented. Based on this method, the seepage characteristics and stability of carbonaceous mudstone embankment during water level rise and fall are calculated. The results show that the proposed method has strong applicability and pertinence, it can comprehensively evaluate the stability of carbonaceous mudstone embankment under the influence of many factors, the rising period of water level and the constant period of high water level, the underground water level inside the embankment, The pore water pressure and saturation increase gradually, the increase amplitude of pore water pressure is inversely proportional to the elevation, the increase amplitude of saturation is proportional to the elevation, the horizontal inward, vertical downward permeability and its peak value, and the horizontal displacement increase first. After decreasing, the vertical displacement increases continuously, the groundwater level, pore water pressure and saturation in the embankment gradually decrease during the period of water level falling and the low water level is constant, and the decrease of pore water pressure is inversely proportional to the elevation. The degree of saturation decrease is proportional to the elevation, the horizontal outward permeability and its peak value, the horizontal outward and vertical downward displacement, the plastic strain area first increases and then decreases, and the vertical downward permeability is "distributed". The research results have certain reference significance for the construction and stability control of carbonaceous mudstone embankment in reservoir and riparian area.
【作者单位】：长沙理工大学道路结构与材料交通行业重点实验室;长沙理工大学土木与建筑学院;长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金项目(51508040,51508079,51678073,51678074) 湖南省自然科学基金项目(2016JJ3010) 湖南省教育厅优秀青年项目(17B013) 湖南省研究生科研创新项目(CX2016B383) 道路结构与材料交通行业重点实验室开放基金项目(kfj150305)
【分类号】：U416.12

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