三峡库区消落带淤泥质土上施工平台填筑方案优化及稳定性分析  

Optimized scheme for filling construction platform using mucky soil in riparian zone of Three Gorges reservoir area and its stability analysis

作　　者：王小华 姚劲松 黄帅 任毕云 丁高俊 杨云杰 WANG Xiaohua;YAO Jinsong;HUANG Shuai;REN Biyun;DING Gaojun;YANG Yunjie(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;Chongqing Water Resources Port and Waterway Construction Group Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]重庆市水利港航建设集团有限公司,重庆401120

出　　处：《水利水电快报》2020年第4期37-42,共6页Express Water Resources & Hydropower Information

摘　　要：三峡库区消落带重庆万州密溪沟至长江四桥综合整治工程穿越回淤严重软土区,拟选取振冲碎石桩法对天然软基进行处理,但在淤泥质土上填筑施工平台成为工程控制性条件。对淤积层力学特性、平台填筑高度以及地基处理区域特征进行分析,提出平台填筑优化方案,优先对满足极限填筑高度区域进行地基处理,其他区域采取插塑料排水板+抛(铺)碎石垫层预固结,平台前缘抛填块石压脚。选取两个典型地质断面,对平台抗滑稳定性进行了计算分析,计算结果证明了优化方案的可行性。An integrated rehabilitation project of riparian zone in the Three Gorges reservoir area,orientated from Mixi trench of Wanzhou,Chongqing,to fourth Yangtze River bridge,is sitting on the deep soft deposit.we planned to adopt vibro-replacement stone column technique to improve the foundation.Filling the construction platform on the soft deposit is critical to the project.We analyzed mechanical properties of the deposit layer,height of the platform,and characteristics of the foundation.We put forward optimized scheme for filling the platform,that is,priority should be given to the foundation that meets the ultimate height limit of filling;combination of plastic drainage board and rubble leveling is adopted for pre-reinforcing rest of the area;stones are dumped in front of the platform.We chose two sections with typical geological condition,and estimated the anti-sliding stability of the platform by taking considerations of changes in water level and vibration stone pile construction,and the results verified the feasibility of the optimized scheme.

关 键 词：消落带 振冲碎石桩法 软弱地基 施工平台填筑 抗滑稳定 三峡库区 

分 类 号：TU43[建筑科学—岩土工程]