型钢与板桩组合式坑中坑支护设计与施工创新  

An Innovation on Design and Construction of Pits in Foundation-Pit Support with Combined Structural Steel and Sheet Piles

作　　者：吴刚 庄宁 洪佳杰 WU Gang;ZHUANG Ning;HONG Jia-jie(Zhejiang Xinsheng Construction Group Co.,Ltd.,Hangzhou 310015,China)

机构地区：[1]浙江新盛建设集团有限公司,浙江杭州310015

出　　处：《工业技术创新》2020年第5期101-105,117,共6页Industrial Technology Innovation

基　　金：浙江省住房和城乡建设厅科学技术项目“预制混凝土构件在临时施工设施中的应用与研究”(2018K135)。

摘　　要：随着地下空间被大量开发和利用,坑中坑的稳定性与安全性越来越成为基坑设计中的关键问题。以杭州运河中央公园工程为例,结合淤泥质粉质粘性土特点,将朗肯土压力理论与库伦土压力理论相结合,得到粘性土的等效内摩擦角φd,进而推演出型钢与板桩组合式坑中坑支护长度L及板桩配筋面积As。将设计的支护参数应用于施工实践,表明支护方案安全性高,现场施工方便,经济合理,支护性能满足GB 50068-2018等国家标准要求。With the development and utilization of underground space,the stability and safety of pits in foundation-pit become more and more important in the foundation-pit design.Taking Hangzhou Canal Central Park Project as an example,combined with the characteristics of muddy silty clay,Rankine’s earth pressure theory and Coulomb’s earth pressure theory are combined to obtain the equivalent internal friction angle φd of the clay,and then the support length L of pits in foundation-pit and reinforcement area As of sheet piles with combined structural steel and sheet piles are deduced.The application of the designed support parameters into the construction practice shows that the support scheme is with high safety,convenient field construction,economy and reasonability,and the support performance meets the requirements of national standard such as GB 50068-2018.

关 键 词：型钢与板桩组合 坑中坑 支护设计 等效内摩擦角 粘性土 

分 类 号：TV551.42[水利工程—水利水电工程]