格宾网加筋红层软岩土石混填路堤在降雨渗入下的宏细观工作机理研究

Regionally distributed redbed soil-rock mixture is largely used as embankment fillings of road engineering in China's redbed area. However, under rainfall infiltration conditions redbed soil-rock embankment generally exists some serious disadvantages such as poor stability, easily cracking, uneven settlement, etc. Geotechnical reinforcement technology is an effective way to alleviate the problem. Basic scientific research on the macro-mesoscopic behavior mechanism of redbed soil-rock embankment reinforced by gabion mesh under rainfall infiltration conditions is conducted through a series of macro-mesoscopic technical means such as model test on reinforced embankment subjected to vertical load and rainfall infiltration, triaxial test, reinforcement-soil interface characteristic test, mesoscopic digital image technology, numerical simulation.The rainwater infiltration mechanism of reinforced redbed soil-rock embankment, redbed soft rock progressive damage law, interaction mechanism between redbed soil-rock mixture and gabion mesh under rainfall conditions will be studied.The macro-mesoscopic mechanics models coupled rainfall environment factors of redbed soil-rock embankment reinforced by gabion mesh, and its multi-field coupling macro-mesoscopic numerical analysis method for simulating behavior mechanism under rainfall infiltration will be built.The macro-mesoscopic damage cumulative effect, evolution patterns and catastrophic failure mode of redbed soil-rock embankment reinforced by gabion mesh in rainfall environment will be revealed.The project will provide a scientific basis and technical support to the safe operation control and performance assessment of redbed soil-rock embankment reinforced by gabion mesh under rainfall infiltration.

红层软岩土石混填路堤在我国红层地区道路工程中应用需求广泛，但降雨渗入条件下其开裂、稳定性不佳及不均匀沉降等问题突出，土工加筋技术是缓解该问题的有效途径。本项目以格宾网加筋红层软岩土石混填路堤为研究对象，利用加筋路堤降雨载荷模型试验、筋-土界面特性试验、三轴试验、细观数字图像技术及数值模拟等宏细观技术手段，对其在降雨渗入条件下的宏细观工作机理进行基础科学研究。研究降雨条件下红层软岩土石混填加筋路堤雨水入渗机制、红层软岩体渐进损伤规律及红层软岩土石混填体-格宾网的相互作用机制，建立耦合降雨环境因素的格宾网加筋红层软岩土石混填路堤系统宏细观力学模型，及其在降雨入渗下工作机理的多场耦合宏细观数值模拟方法，揭示降雨环境中格宾网加筋红层软岩土石混填路堤性能的宏细观损伤累积效应、演化规律及灾变失效机制。本项目将对降雨条件下格宾网加筋红层软岩土石混填路堤的安全运行控制及性能评估提供科学依据与技术支撑。

红层软岩土石混填加筋路堤在降雨渗入下的工作机理研究，是我国广大红层地区红层软岩土石混填路堤工程实践发展带来的新课题。本项目基于已有成果和宏观、细观的多尺度理论，对格宾网加筋红层软岩土石混填路堤在降雨入渗下的工作机理深入研究，利用实体试验、三轴试验、细观数字图像技术及数值模拟等宏细观技术手段，研究降雨条件下格宾网加筋红层软岩土石混填路堤雨水入渗机制、红层软岩体渐进损伤规律及红层软岩土石混填体-格宾网的相互作用机制，建立耦合降雨环境因素的格宾网加筋红层软岩土石混填路堤宏细观力学模型，揭示降雨环境中格宾网加筋红层软岩土石混填路堤的宏细观工作机制。已发表科研论文5篇（EI期刊收录3篇），其中项目主持人为第一作者发表3篇（均EI期刊收录）、通讯作者发表1篇；项目主持人为第一发明人获国家专利1项（授权专利号：CN201620220181.3），另申请了国家发明专利（一种土体雨水入渗特性批量化实验装置及其使用方法，申请号：201611212987.9）；部分研究成果论文（专著）正在投稿或审理中。研究成果将对红层地区修建安全可靠的红层软岩土石混填路堤、节省工程投资、保护生态环境具有重要的指导意义，具有重要的学术价值和广阔的工程应用前景。