According to the relationship between permeability and porosity of geotechnical materials, a finite element model representing pore and solid particles is generated randomly according to the porosity of a given finite element calculation model. According to Darcy’s law of flow distribution and steady seepage in the finite element random simulation section, the equivalent permeability coefficients at different porosities are calculated, and the relationship between the equivalent permeability coefficient and the porosity of rock and soil is studied. The results show that the equivalent permeability coefficient is proportional to the porosity with the same pore size. In order to study the seepage characteristics of structural planes of nonmaterial geotechnical materials in different strata contact zones, the formulas for calculating the deformation parameters and permeability coefficients of heterogeneous rock masses with single nonmaterial geotechnical materials are deduced theoretically, and the correctness and applicability of the formulas are verified by experiments. The rock mass sample selected in this paper is granite, which is simulated and analyzed by sandstone in the experiment. The results show that the permeability coefficients of coarse sandstone, fine sandstone, and heterogeneous rock mass are different under the same water pressure and confining pressure. This shows that the lithology on both sides of the nonmaterial geotechnical material surface has a significant influence on the permeability of the nonmaterial geotechnical material rock mass; the permeability coefficient of the nonmaterial geotechnical material rock mass decreases with the increase of confining pressure, the numerical change is limited to a certain confining pressure range, and the permeability coefficient tends to be stable when the confining pressure reaches a certain value. Comparing the theoretical calculation value of permeability coefficient of rock mass with the experimental result, it is found that the two values are in good agreement, which indicates the correctness and applicability of the theoretical calculation formula of permeability coefficient of rock mass of single intangible geotechnical material.

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基于数字图像的非均质土工材料渗透系数研究

根据岩土材料的渗透率与孔隙率之间的关系，根据给定有限元计算模型的孔隙率随机生成表示孔隙和固体颗粒的有限元模型。根据有限元随机模拟区的达西定律和渗流规律，计算了不同孔隙度时的等效渗透系数，研究了等效渗透率与岩土孔隙率之间的关系。结果表明，在相同孔径下，等效渗透系数与孔隙率成正比。为了研究非材料岩土材料在不同地层接触区的结构面的渗流特性，从理论上推导了计算非单一岩土材料非均质岩体变形参数和渗透系数的公式，并通过实验验证了该公式的正确性和适用性。本文选择的岩体样品为花岗岩，在实验中用砂岩进行模拟分析。结果表明，在相同水压和围压下，粗砂岩，细砂岩和非均质岩体的渗透系数不同。这表明非材料岩土材料表面两侧的岩性对非材料岩土材料岩体的渗透性有很大的影响。非材料岩土材料岩体的渗透系数随围压的增加而减小，数值变化被限制在一定的围压范围内，当围压达到一定值时渗透系数趋于稳定。将岩体渗透系数的理论计算值与实验结果进行比较，发现两个值吻合良好，表明单一无形岩土材料岩体渗透系数理论计算公式的正确性和适用性。 。当围压达到一定值时，渗透系数趋于稳定。将岩体渗透系数的理论计算值与实验结果进行比较，发现两个值吻合良好，表明单一无形岩土材料岩体渗透系数理论计算公式的正确性和适用性。 。当围压达到一定值时，渗透系数趋于稳定。将岩体渗透系数的理论计算值与实验结果进行比较，发现两个值吻合良好，表明单一无形岩土材料岩体渗透系数理论计算公式的正确性和适用性。 。