粉煤灰加筋高填路基边坡稳定性分析

发布时间：2018-06-22 14:38

本文选题：湿排粉煤灰 + 土工格栅加筋路基边坡　；参考：《青岛理工大学》2014年硕士论文

【摘要】：土工格栅具有高强度、低变形、耐腐蚀、与土的相互作用力大等特点，可以作为重要的或永久性结构物使用。粉煤灰自重轻，与土工合成材料的相互作用力大，作为土工结构物的填料可以减轻作用在地基上的堆载、挡土墙上的土压力、边坡的自重应力，同时变废为宝、节省工程造价，又可以避免可能因为开采砂石导致对生态环境的破坏。用粉煤灰作为加固土体的加筋复合体结构迄今研究相对较少，但废弃的粉煤灰的应用前景却相当广泛，尤其是考虑用粉煤灰修建堤坝、路基边坡、支挡结构更具有其深远意义。本文结合海水、淡水养护粉煤灰的强度特性以及土工格栅与填料相互作用的界面特性和加筋机理，依托美国TIACSA咨询公司开发的FLAC岩土工程分析软件对土工格栅加筋粉煤灰路基边坡的稳定性进行分析研究。具体的内容包括：（1）通过对海水湿排粉煤灰、水泥固化粉煤灰的力学特性分析研究，得到了水泥固化海水湿排粉煤灰基本力学性质及指标。研究表明，，水泥固化海水湿排粉煤灰具有良好的稳定性和耐久性，拌合固化混合料强度随龄期稳定增长，随水泥掺量增加强度提高。该研究对边坡结构、路基加固及地基处理等工程应用有重要的理论与实践研究价值。（2）查阅资料，阐述土工格栅与填料相互作用的界面特性和加筋机理。（3）加筋边坡稳定性分析。依托软件FLAC3D，利用强度折减系数法,分析边坡的稳定性，取得安全系数。为土工格栅加筋粉煤灰路基边坡的广泛应用提供工程依据。
[Abstract]:Geogrid has the characteristics of high strength, low deformation, corrosion resistance, and strong interaction with soil. It can be used as an important or permanent structure. The fly ash has a light weight and the interaction force with the geosynthetics is great. As a filler of the geosynthetics, it can reduce the load on the foundation and the earth pressure on the wall of the retaining wall. The self weight stress and the transformation of waste into treasure can save the cost of the project and avoid the damage to the ecological environment because of the mining of sand and rock. The research on the reinforced composite structure with the fly ash as the reinforcement of the soil is relatively small, but the application prospect of the abandoned fly ash is widespread, especially the construction of the embankment with the fly ash. Based on the strength characteristics of the fly ash and the interfacial characteristics and reinforcement mechanism of the geogrid and fillers, the stability of the geogrid reinforced fly ash roadbed slope is carried out based on the FLAC geotechnical analysis software developed by TIACSA consulting company of the United States. The specific contents include:
(1) through the analysis and study of the mechanical properties of the wet fly ash and cement solidified fly ash, the basic mechanical properties and indexes of cement solidified sea wet fly ash are obtained. The research shows that the cement solidified sea wet fly ash has good stability and durability, and the strength of the mixing solidified mixture increases steadily with the age of the cement, with the cement mixed with the cement. The study has important theoretical and practical research value for slope engineering, subgrade reinforcement and foundation treatment.
(2) consult the data to explain the interface characteristics and reinforcement mechanism of the interaction between geogrids and fillers.
(3) the stability analysis of the reinforced slope. Relying on the software FLAC3D, the stability of the slope is analyzed by the strength reduction coefficient method, and the safety factor is obtained. It provides the engineering basis for the wide application of the geogrid reinforced fly ash roadbed slope.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14

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