Permeability Prediction Model Modified on Kozeny-Carman for Building Foundation of Clay Soil
Permeability Prediction Model Modified on Kozeny-Carman for Building Foundation of Clay Soil
复制标题
修正Kozeny-Carman 粘土地基渗透率预测模型
DOI：
10.3390/buildings12111798
复制
发表时间：
2022-11-01
期刊：
影响因子：
3.8
通讯作者：
Gu, Renguo
中科院分区：
文献类型：
--
作者：
Chen, Jian;Tong, Huawei;Gu, Renguo
粘性土是一种常见的建筑地基材料，其渗透性对基坑的安全和建筑物的后期沉降至关重要。然而，传统的Kozeny-Carman（K-C）公式在预测建筑地基处理中粘土的渗透性时存在严重的偏差。因此，解决K-C方程在粘土中的应用问题是工程界和学者们面临的一个难题。本文分析了粘土矿物学对孔隙结构和渗透率的影响，提出了有效e（eeff）和有效SSA（Seff）的概念。在此基础上，建立了基于Kozeny-Carman修正的渗透率预测模型。通过两种粘土样的渗流试验对该预测模型进行了验证，同时采用MIP结合冷冻干燥法得到了Seff和eeff。通过对试验结果的讨论，得出三个主要结论：（1）由于粘土矿物的影响，粘土中存在无效孔隙，这是K-C方程不适用于粘土的原因;（2）eeff和Seff能反映粘土在渗流过程中的结构状态;（3）本文建立的渗透率预测模型与试验结果吻合较好，表明该预测模型适用于粘土。本文的研究成果对于解决K-C方程不适用于粘土的理论问题，保证粘土地区建筑基坑的安全具有重要意义。
Clay soil is a common building foundation material, and its permeability is very important for the safety of foundation pits and the later settlement of buildings. However, the traditional Kozeny-Carman (K-C) equation shows serious discrepancies when predicting the permeability of clay in building foundation treatment. Therefore, solving the application of K-C equation in clay is a problem faced by the engineers and scholars. In this paper, the influence of clay mineralogy on pore structure and permeability is analyzed, and then the effective e (eeff) and effective SSA (Seff) are proposed. Based on the eeff and Seff, the permeability prediction model modified on Kozeny-Carman is built. Then, seepage experiments are conducted on two types of clay samples to test this prediction model; at the same time, the MIP combining freeze-drying methods are used to obtain the Seff and eeff. Through the discussion of the test results, three main conclusions are obtained: (1) there are invalid pores in clay due to the influence of clay mineral, this is the reason for which K-C equation is unsuitable for clay; (2) the eeff and Seff can reflect the structural state of clay during seepage; (3) the results of the permeability prediction model in this paper agree well with the test results, which indicates that this prediction model is applicable to clay. The research results of this paper are significant to solve the academic problem that K-C equation is not applicable to clay and significant to ensure the safety of building foundation pits in clay areas.