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Large-Scale Model Swelling Potential of Expansive Soils in Comparison with Oedometer Swelling Methods
Iranian Journal of Science and Technology, Transactions of Civil Engineering ( IF 1.7 ) Pub Date : 2019-09-03 , DOI: 10.1007/s40996-019-00307-6
Yousif Ismael Mawlood , Rizgar Ali Hummadi

Samples of natural high, medium and low expansive soils (respectively, designated as Soil - A , Soil - B and Soil - C ) were collected from different locations to obtain a wide range of swelling criteria. Soil - B was mixed with 5%, 10%, 15%, 20% and 25% bentonite mineral. The swell potentials of the expansive soil samples were measured using standard test methods for natural deposits and reconstituted samples. The non-homogeneous soil formation in the field and the existing micro- and macrocracks due to drying shrinkage hindered the accurate prediction of the swelling index of the small-scale samples under different stages of field conditions. A large-scale model was established to improve the accuracy and reliability of the test results. The proposed model was designed to estimate the swelling potential of the reconstituted samples under simulated field conditions. The empirical relationships of the multiple regression analysis models were determined on the basis of the best statistical information criteria using STATGRAPHICS Centurion XVII V.17.200. Results supported the prediction of the swelling potential on the basis of the physical properties of soils, thereby alleviating the need to conduct oedometer tests. The proposed relationships and the equations in the literature were compared with the test results of these samples. Overall, the oedometer technique overestimates ground heave by approximately 1.5%, and the proposed relationships are consistent with the measurement results of some researchers but inconsistent with those of others.

中文翻译:

膨胀土的大尺度模型膨胀势与固结仪膨胀方法的比较

从不同地点收集天然高、中、低膨胀土(分别指定为土壤-A、土壤-B 和土壤-C)的样品,以获得广泛的膨胀标准。土壤-B 与 5%、10%、15%、20% 和 25% 的膨润土矿物混合。膨胀土样品的膨胀势使用标准测试方法测量天然沉积物和重建样品。田间土壤形成的非均质性以及因干缩导致的微裂纹和宏观裂纹的存在,阻碍了对不同阶段田间条件下小样本膨胀指数的准确预测。建立大规模模型以提高测试结果的准确性和可靠性。所提出的模型旨在估计模拟现场条件下重构样品的溶胀潜力。多元回归分析模型的经验关系是根据使用 STATGRAPHICS Centurion XVII V.17.200 的最佳统计信息标准确定的。结果支持基于土壤物理特性的膨胀潜力预测,从而减少了进行固结仪测试的需要。将文献中提出的关系和方程与这些样品的测试结果进行了比较。总体而言,固结仪技术高估了约 1.5% 的地面隆起,所提出的关系与一些研究人员的测量结果一致,但与其他人的测量结果不一致。多元回归分析模型的经验关系是根据使用 STATGRAPHICS Centurion XVII V.17.200 的最佳统计信息标准确定的。结果支持基于土壤物理特性的膨胀潜力预测,从而减少了进行固结仪测试的需要。将文献中提出的关系和方程与这些样品的测试结果进行了比较。总体而言,固结仪技术高估了约 1.5% 的地面隆起,所提出的关系与一些研究人员的测量结果一致,但与其他人的测量结果不一致。多元回归分析模型的经验关系是根据使用 STATGRAPHICS Centurion XVII V.17.200 的最佳统计信息标准确定的。结果支持基于土壤物理特性的膨胀潜力预测,从而减少了进行固结仪测试的需要。将文献中提出的关系和方程与这些样品的测试结果进行了比较。总体而言,固结仪技术高估了约 1.5% 的地面隆起,所提出的关系与一些研究人员的测量结果一致,但与其他人的测量结果不一致。结果支持基于土壤物理特性的膨胀潜力预测,从而减少了进行固结仪测试的需要。将文献中提出的关系和方程与这些样品的测试结果进行了比较。总体而言,固结仪技术高估了约 1.5% 的地面隆起,所提出的关系与一些研究人员的测量结果一致,但与其他人的测量结果不一致。结果支持基于土壤物理特性的膨胀潜力预测,从而减少了进行固结仪测试的需要。将文献中提出的关系和方程与这些样品的测试结果进行了比较。总体而言,固结仪技术高估了约 1.5% 的地面隆起,所提出的关系与一些研究人员的测量结果一致,但与其他人的测量结果不一致。
更新日期:2019-09-03
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