刘茂, 袁磊, 张鹏. 2020: 不规则隔水地质界面上覆均质土体稳态浸润线研究. 工程地质学报, 28(S1): 25-32. DOI: 10.13544/j.cnki.jeg.2020-249
    引用本文: 刘茂, 袁磊, 张鹏. 2020: 不规则隔水地质界面上覆均质土体稳态浸润线研究. 工程地质学报, 28(S1): 25-32. DOI: 10.13544/j.cnki.jeg.2020-249
    LIU Mao, YUAN Lei, ZHANG Peng. 2020: STUDY ON STEADY STATE PHREATIC SURFACES OF HOMOGENEOUS SOIL OVERLYING IRREGULAR IMPERVIOUS GEOLOGICAL INTERFACE. JOURNAL OF ENGINEERING GEOLOGY, 28(S1): 25-32. DOI: 10.13544/j.cnki.jeg.2020-249
    Citation: LIU Mao, YUAN Lei, ZHANG Peng. 2020: STUDY ON STEADY STATE PHREATIC SURFACES OF HOMOGENEOUS SOIL OVERLYING IRREGULAR IMPERVIOUS GEOLOGICAL INTERFACE. JOURNAL OF ENGINEERING GEOLOGY, 28(S1): 25-32. DOI: 10.13544/j.cnki.jeg.2020-249

    不规则隔水地质界面上覆均质土体稳态浸润线研究

    STUDY ON STEADY STATE PHREATIC SURFACES OF HOMOGENEOUS SOIL OVERLYING IRREGULAR IMPERVIOUS GEOLOGICAL INTERFACE

    • 摘要: 地下水的分布对斜坡(滑坡)稳定性评价和治理有着重要的影响,且其影响因素较多,目前,对于下伏不规则隔水地质界面上斜坡的稳态浸润线还没有可用的解析解,特别是已知斜坡(滑坡)体上具有已知水位的情况下,准确确定已知水位之间坡体的浸润线对斜坡(滑坡)稳定性评价有重要作用,因此,下伏不规则隔水地质界面上斜坡的稳态浸润线研究是很有必要的。本文采用自由表面流的简化,推导了下伏隔水地质界面上均质土体的单宽含水层流量表达式,依据基床倾角把均质含水层流量表达式(Boussinesq方程式)分为两种:顺坡和逆坡。依据两种Boussinesq方程式,利用流体连续性原理,得到了下伏不规则隔水地质界面上均质土体的稳态浸润线方程和流量,通过与数值模拟(Autobank有限元程序)结果对比可知,本文的解析解与有限元数值模拟(Autobank有限元程序)的稳态浸润线和通过的流量基本一致。由于采用了Dupuit近似,本文的解析解与数值解存在一定的误差,顺坡的误差大于逆坡,坡度较大的误差大于坡度较小的误差,庆幸的是该近似产生的误差很小,总体来说,该稳态浸润线解析方法是可靠、稳定和合理的。

       

      Abstract: The distribution of groundwater has a significant impact on the stability and treatment of slopes(landslides), and there are many influencing factors. At present, there are no analytical formula for the steady state phreatic surfaces of homogeneous soil overlying irregular impervious geological interface, especially knowing that the slope(landslide) body has a known water level, accurately determining the infiltration line of the slope body between the known water levels plays an important role in evaluating the stability of the slope(landslide).Therefore, It is necessary to study the steady state phreatic surfaces of homogeneous soil overlying irregular impervious geological interface. Based on the simplification of free surface flow, this paper deduces the expression of groundwater single-width aquifer flow of homogeneous soil on the bed with a certain slope(impermeable). According to the bed inclination angle, the expression of homogeneous aquifer flow(Boussinesq equation) is divided into two kinds of expressions(downstream slope and reverse slope). According to two Boussinesq equations and the principle of fluid continuity, the steady seepage analytical formula of phreatic surfaces and the flow of homogeneous soil overlying irregular impervious geological interface are obtained. By comparing with the results of numerical simulation(Autobank finite element program),it can be seen that the analytical solution in this paper is basically consistent with the phreatic surfaces and the flow rate of finite element numerical simulation(Autobank finite element program). Due to the use of the Dupuit approximation, there is a certain error between the analytical solution and the numerical solution. The error along the slope is greater than that of the reverse slope, and the larger error of the slope is larger than that of the smaller slope. Fortunately, the error caused by the approximation is very small. Generally speaking, the analytical method of the steady-state phreatic surfaces is reliable, stable and logical.

       

    /

    返回文章
    返回