周期性饱水砂泥岩混合料的劣化机理及其演化过程

项目名称： 周期性饱水砂泥岩混合料的劣化机理及其演化过程

项目编号： No.51479012

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 水利工程

项目作者： 王俊杰

作者单位： 重庆交通大学

项目金额： 80万元

中文摘要： 在库岸等涉水工程建设中，当砂泥岩混合料被填筑于库水位变幅区域时，必然因为库水位变化经受周期性饱水作用。周期性饱水作用将劣化砂泥岩混合料，严重时可能导致沿岸结构物发生变形、开裂甚至失稳。如何在涉水工程中科学合理地利用砂泥岩混合料，已成为亟待解决的关键科学问题。项目利用自行研制的土体饱水-疏干循环三轴压缩试验系统、压缩试验系统和静止侧压力系数测试系统等先进仪器开展试验研究，查明周期性饱水砂泥岩混合料的强度及变形特性。在机理层面上，从砂岩颗粒和泥岩颗粒的差异劣化角度入手，揭示周期性饱水砂泥岩混合料的劣化机理。在理论层面上，用劣化评价指标反映劣化特征，先基于劣化评价指标的演变规律，揭示周期性饱水砂泥岩混合料的劣化演化过程；再基于劣化演化过程，确定周期性饱水劣化指标的计算方法，建立能够描述周期性饱水砂泥岩混合料劣化的数学模型。项目成果有益于解决砂泥岩混合料在涉水工程中的利用问题，具有重大的理论意义。

中文关键词： 岩土工程；岩土力学；力学特性；破坏机理；试验研究

英文摘要： The mixture of sandstone and mudstone particles, if it is filled in the zone of variable water level during the construction works along reservoir bank or other waterfront projects, will go through the effect of periodic saturation due to the change of the reservoir water level. The periodic saturation may deteriorate the mixture. While the deterioration is large enough, the structure or building along the bank may deform, crack and even fail. Hence, it has become a critical issue that how to use scientifically and reasonably the sandstone-mudstone particle mixture in the hydrographic works as a filling material. In this study, the strength and deformation characteristics of the mixture after periodic saturation will be ascertained using experimental studies. Some advanced instruments will be used in the experimental studies. They include at least the triaxial test equipment, compression test system, and lateral pressure coefficient test system. The three instruments, which can simulate the course of saturation and dry cycle, are developed by the investigators of the present study. The deterioration mechanism of the sandstone-mudstone particle mixture induced by the periodic saturation effect will be revealed on the base of analyzing on the difference in degradation between sandstone and mudstone particles. At the theoretical level, some degradation indexes may be suggested to reflect the characteristics of degradation. The evolutionary process of the deterioration induced by the periodic saturation will firstly be revealed by analyzing the change of the degradation indexes.Then, according to the evolutionary process of the degradation, and the calculating method on the degradation indexes, a mathematical model of degradation will be established or suggested. The mathemetical model can describe the deterioration property of the sandstone-mudstone particle mixture induced by the periodic saturation. It can be certained that the studing conclusion from this study is beneficial to solve the problem how to use the sandstone-mudstone particle mixture in hydrographic construction as a filling material. The researching works in the present study does therefore have important theoretical significance and construction value.

英文关键词： Geotechnical engineering;Geomechanics;Mechanical behavior;Failure mechanism;Experimental study