摘要
某工程规划总建筑面积约91040m^2,基坑开挖±0.000以下19.50m,属于深基坑。深基坑开挖后,因固结性差的土层临空面在地下水渗流的动水压力作用下很快会失稳坍塌,要进行支护。根据建筑物上部荷载特征、地基土工程性能较差及地区工程建设经验,对该基坑各面选用合适的方法分别进行支护(AB段设计采用复合土钉墙支护方式;BCD段使用土钉墙+桩锚支护的方式;DEA段设计桩锚支护),提出施工方法及技术、质量和现场质量检测等方法和要求,以达到工程需要,保证基坑边坡稳定性与安全。
A very large deep excavation project is located at the east and south sides of Fengshun Street and north side of the People＇s Bank of China.The planned building area is approximately 91,040 square meters and the deepest excavation is approximately 19.5meters below the proposed ground floor.Due to the high groundwater level,the excavation support is necessary otherwise the side soils would be collapsed under the seepage force.Based on the excavation requirements and the superstructure types,different excavation support systems are used：Segment AB was designed using combined soil nailed wall supporting system;Segment BCD used soil nailed wall plus soldier pile with ground anchor system;and Segment DEA utilized soldier pile with ground anchor as the primary support measure.The construction procedures,quality assurance and in-situ monitoring at each segment are also presented in the paper.
出处
《土工基础》
2016年第6期622-626,共5页
Soil Engineering and Foundation
基金
国家自然科学基金(5136 8015)
关键词
基坑支护
施工技术
监测
沉降
降水工程
Deep Excavation Support
Construction Technique
Construction Monitoring
Settlement
Dewatering Project
