西北山区永久性边坡预应力锚固结构性能退化及全寿命稳定性控制研究

According to the hydrogeological conditions, natural environment, and long-term working conditions, a number of studies on long-term erformance and whole life stability control of prestressed anchorage structure are carried out for permanent high soil slope. First of all, aimed at each factors affecting long-term performance of prestressed anchorage concrete structure,some deterioration tests of material properties are performed in order to reveal the evolution of the degradation process of material properties of anchorage structure and to obtain a quantitative evaluation parameters of material properties degradation. Secondly,some reseahces on mechanism of whole life stability control of prestressed anchorage structure are carried out for permanent high soil slope, and the model tests are carried out to reveal the variation of internal forces and derfomaiton of prestressed anchorage structure as well as stress and displacement state of slope soil inside. Third, Based on optical fiber sensing technology, some esearches on modes and methods of long-term stability monitoring of prestressed anchorage structure are carried out to establish a system of real-time assessment and predictive of slope stability. Finally, through in-depth analysis of damage formation process and long-term perfomance degradation rule in the full life cycle of prestressed anchorage structure, regarded the permanent monitoring data as a real dynamic parameter modification, a new model and perceptual system of stability control of prestressed anchorage structure are poposed for permanent high soil slope. These researches will have very important scientific significance and practical value for the design, construction and maintenance of permanent prestressed anchorage structure.

根据西北山区边坡预应力锚固结构所处的地质、自然环境，以及结构长期工作条件，开展永久性边坡预应力锚固结构性能退化及全寿命稳定性控制研究。首先，针对永久性支护结构长期性能的各影响因素进行支护结构材料性能劣化试验，以揭示支护结构材料长期性能的劣化过程与演变规律，取得材料性能退化定量评价参数。其次，开展永久性高边坡预应力锚固结构全寿命稳定性控制机理研究，并进行预应力锚固稳定性控制模型试验，揭示边坡预应力锚固结构在全寿命阶段结构内力、变形及土体应力及位移状态变化规律。再次，结合光纤传感监测技术，提出岩土高边坡预应力锚固结构长期稳定性监测模式与方法。最后，深入研究整个生命周期边坡预应力锚固结构损伤及其性能退化规律，将长期监测数据视为时实动态参数修正，建立一种基于全寿命动态监测的永久性岩土高边坡预应力锚固结构稳定性控制模型及感知系统。成果对永久性岩土预应力锚固工程设计、施工及后期维修具有重要科学意义。

本项目主要依据西北山区边坡预应力锚固结构所处的地质、自然环境，以及结构长期工作条件，开展了永久性边坡预应力锚固结构性能退化及全寿命稳定性控制研究。首先，针对可能存在的侵蚀因素和腐蚀因子的种类及含量，选取了氯离子、碳酸氢根离子为腐蚀影响因子，进行了支护结构材料性能劣化试验，主要揭示了预应力锚索应力腐蚀后长期性能的劣化过程与演变规律，取得了相关材料性能退化定量评价参数。其次，对影响边坡稳定性的因素进行研究分析，开展了永久性高边坡预应力锚固结构全寿命稳定性控制机理研究，并进行预应力锚固稳定性控制模型试验，揭示了边坡预应力锚固结构在全寿命阶段结构内力、变形及土体应力及位移状态变化规律，提出了一种基于应力场网格化离散三维边坡稳定性控制计算模型。再次，结合光纤传感监测技术，针对长期性服役情况下，开展预应力锚固结构岩土边坡长期稳定性监测方法及模型试验研究，提出具有经济性、高效性的全新监测方法。通过室内模型试验，证明了新型光纤布拉格光栅传感装置布设在土体内部用来监测内部土体的位移情况切实可行、证明了立体网格形式监测方法对岩土边坡内部土体进行监测是可行的。通过数值模拟，证明了室内模型试验的可靠性，同时进一步验证了立体网格形式监测方法的可行性以及准确性。最后，深入研究整个生命周期边坡预应力锚固结构损伤及其性能退化规律，将长期监测数据视为时实动态参数修正，从理论上建立了一种基于全寿命动态监测修正的永久性岩土高边坡预应力锚固结构稳定性控制系统。研究成果对永久性岩土预应力锚固工程设计、施工及后期维修具有重要科学意义。

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