Deep Excavation Supported by Diaphragm Wall: A Case Study
Tóm tắt
Space scarcity and demand for us to build skyscrapers as well as deeper basements are increasing in the present scenario. Excavations are commonly carried out in congested areas to increase underground usable spaces. Hence a case study is made on shoring system for excavation depth of 14.2 m for an office block located in Noida. The office blocks which consist of 14 stories with 3 levels of combined basement are surrounded by existing structures and service lines. Subsoil of the study area mainly consists of two strata, silty sand with occasional gravel and sand with traces of silt at deeper depth. Diaphragm wall is supported by soil anchors during excavation and after basement construction is over, the diaphragm wall will derive horizontal support from the floor slabs and the basement raft. Hence analyses of diaphragm wall are divided into two phases and are carried out using PLAXIS 2D and STAAD Pro software. Inclinometers are used to monitor the diaphragm wall deflection and a similar trend of displacement pattern is observed between the predicted and the measured lateral deflection of the wall. Cross-hole sonic logging and Koden test were also carried out to check the quality of concrete and verticality of the drilled hole respectively.
Tài liệu tham khảo
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