土工合成材料在三峡库区重庆市万州区库岸防护中的应用可行性研究

Feasibility Study of the Use of Geosynthetics in Bank Slopes Maintenance in Wanzhou Town, Chongqing City in the Three Gorges Reservoir Area

三峡水库建成后,库水位的消涨变化非常频繁且变化幅度比水库建造前有了明显提高.这势必会对库岸的稳定性产生影响,引起库岸堆积体沿深层基岩面滑动或发生塌岸,必须采取工程措施进行防治.而土工合成材料以其良好的整体性、抗变形能力、保土透水性能及施工简便、造价低等独特优势和兼具反滤、排水、防渗、隔离、防护、加筋等强大功能不失为一种上好的库岸防护材料.本文首先介绍了土工合成材料的种类及其功能,进而简单介绍了土工合成材料在库岸防护工程中的应用现状;然后在详细分析了重庆市万州区鞍子坝库岸段工程地质条件的基础上计算了堆积体沿基岩面滑动的稳定性,并分析了库岸的破坏形式;最后对库岸防护采用加筋土进行了初步设计并对设计从外部稳定性(地基承载力、抗滑稳定性、抗倾覆稳定性)和内部稳定性(土工格栅强度和抗拔稳定性)进行了验算.研究结果认为利用土工合成材料对库岸防护完全可行.

After the completion of the the Three Gorges Project, frequency of the water table fluctuation in the reservoir area will increase dramatically than before, which will give rise to great influence to banks slopes stability. Slopes failure such as landslides, debris flow may occur in the long run. Since geosynthetics materials have many merits, for example good unity, excellent penetrability, low cost, easiest construction and so on, geosynthetics are excellent materials in bank slopes maintenance, which has been verified by many projects. Status in quo of the use of geosynthetics in bank slopes maintenance has been introduced first in this paper.Then a case study has been discussed in detail. The result has showed the feasibility of the use of geosynthetics in bank slopes maintenance.