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| 1 | 层状土体变特性及变形计算方法研究进展显示文摘由于传统的地基变形计算方法应用于计算大型基础下层状土变形的局限性,在对国内外非自由场(受载)层状土的变形性能研究现状及其发展趋势进行深入分析的基础上,总结了非自由场层状土的体变理论在工程应用中尚存在的问题。结果表明,目前对层状土的静动力体变特性研究还不够深入,现有方法不能在宏微观两个层面上表征土骨架与孔隙水的相互作用,无法同时考虑地基中不同类型土的本构关系、物理力学性质及基底有效附加应力的空间传递与叠加过程,导致计算结果与实际情形相差甚远,只能靠引入经验系数的做法来解决问题。基于此,选取适用于描述非自由场层状土体变特性的理论方法,揭示土-水-力多场耦合作用下复杂地基土的变形演化规律,构建科学合理的层状土体变预测模型,是今后需要深入研究的方向。 | 李纯 王煜斌 王刚 | 2023 | 水利与建筑工程学报2023，21，4： | 0 |
| 2 | Evaluation of red soil-bentonite mixtures for compacted clay liners显示文摘Compacted clay liners are an integral part of the waste landfills,which are provided to contain the leachate within the landfills and protect the surrounding environment.Generally,locally available natural soils are used for the construction of compacted clay liners if they satisfy the design criteria.However,not all soils in their natural state satisfy all the design criteria for the liner materials.Thus,there is a definite need to modify the locally available natural soils by blending with bentonite to meet the required design criteria for the liners.In view of this,the present study evaluates the suitability of an Indian red soil enhanced with bentonite as a liner material.To achieve this,a series of experiments were carried out using locally available red soil and bentonite.First,the suitability of the red soil was evaluated as a liner material.The experimental results showed that the red soil met all the selection criteria stipulated by the Environmental Protection Agencies(EPAs)for the liners except the hydraulic conductivity criterion.Therefore,the red soil was mixed with bentonite contents of 10%,20%and 30%,and the red soil-bentonite mixtures were evaluated for their suitability for liners in their compacted state.Further,as the liners in the arid and semi-arid regions are subjected to moisture variations due to seasonal moisture fluctuations and other factors,the red soil-bentonite mixtures were subjected to wetdry cycles,and their suitability was evaluated after wet-dry cycles.The experimental results revealed that all the red soil-bentonite mixtures met the stipulated EPA criteria for the liners in the as-compacted state.However,the red soil-bentonite mixtures with 20%and 30%bentonite contents only satisfied the hydraulic conductivity requirement even after wet-dry cycles.The experimental findings were supplemented with the microstructural insights captured through digital camera images,scanning electron microscopy(SEM),and mercury intrusion porosimetry(MIP)studies. | A.S.Devapriya T.Thyagaraj | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，2： | 0 |
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