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Structural design of retaining wall with ecological geo-textile bags and its changes in mechanical properties
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摘要: 目前我国河流整治工程中过度硬化现象仍然普遍，亟需开发和应用兼具生态保护、资源可持续利用以及符合工程安全需求的生态护岸技术。生态袋挡墙护岸技术是能够将生态岸坡和墙体工程完美融合的系统，该系统解决了结构工程与生态工程结为一体的难题。以南京市板桥河岸坡整治工程为例，详细研究了生态袋挡墙护岸结构的设计、施工及植被种植技术。通过现场试验段的全过程跟踪，总结归纳出影响生态袋挡墙护岸工程质量的主要因素为生态袋体质量、加筋材料质量、袋内土体密实度、植被覆盖度等。以生态袋这一典型柔性护岸材料为例，通过对比全新生态袋、工程中已使用1.5年的生态袋力学性能和抗老化性能，评估生态袋的耐久性，研究生态岸坡工程质量与生态袋物理力学性能的内在联系，结论表明使用1.5年后的生态袋力学性能保持率较好，但较难满足30年使用寿命的设计要求。必须进一步改进生态袋护岸工程设计和施工方案，以满足工程耐久性能与力学性能要求。Abstract: At present, an excessive hardening phenomenon is still prevalent in the river regulation works of China. It is urgent to develop ecological revetment technologies for meeting the requirements of ecological protection, sustainable utilization of resources and works safety. The eco-bag retaining wall revetment is the only system which can perfectly integrate the ecological slope with wall works, and the system is a successful way to solve problems of integration of the structural engineering and the ecological engineering. In this paper, taking the bank slope regulation works of the Banqiao River of Nanjing city as a classic case, the design, construction and vegetation planting technologies of the eco-bag retaining wall revetment have been studied in detail. The field test results show that the main factors affecting the engineering quality of the retaining wall revetment of the ecological geo-textile bag are the qualities of the bag， the reinforced material, soil compactness in the bag and vegetation coverage. Taking the ecological geo-textile bag, a typical flexible revetment material, as an example, by comparing the mechanical properties and aging-resistant performance of a new ecological geo-textile bag and an old ecological geo-textile bag used for 1.5 years, the ecological geo-textile bag’s durability is evaluated and studies of the intrinsic relationships between the physico-chemical properties for the ecological geo-textile bag and the engineering quality of the bank slope have been carried out too. The test results show that the retention rate of the mechanical properties is better for the ecological geo-textile bag used for 1.5 years, but it is difficult to meet the requirements of design for 30 years service life. The improved design and construction schemes for the revetment works with the ecological geo-textile bags must be further proposed in order to meet the requirements of mechanics and durability of the revetment works.
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期刊类型引用(18)
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