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Performance of a deep excavation and the influence on adjacent piles:A case history in karst region covered by clay and sand

引用

Underground Space 2023年第1期8卷 45-60页

作者： Yubing Yang Caiyuan Chen Chao Liu Longtian Huang Wei Chen Nengyou Lin Jie Cui Wandong Xie College of water Conservancy and Civil Engineering South China Agricultural UniversityGuangzhou 510642PR China School of Civil Engineering Guangzhou UniversityGuangzhou 510006PR China Architectural Design and Research Institute of Guangdong Province Guangzhou 510010PR China CCCC–FHDI Engineering Co. LtdGuangzhou 510290PR China

This paper presents a case study of deep excavation adjacent to an existing bridge in karst region of Guangzhou city,*** movements of retaining structures,settlements of surrounding ground and pipelines,and the responses of bridge piles were measured and evaluated.A sudden surge of groundwater was recorded at the north pit when excavated ***-cement columns using the Metro Jet System(MJS)method was employed along the outer perimeters of the diaphragm wall where water inflow occurred,for the sake of blocking the flow *** measured maximum wall deflection dhm in this case ranged from 0.13%H to 0.3%H,with a mean value of 0.2%H(H is the excavation depth),which agreed well with the empirical prediction in mixed *** the MJS treatment,the wall and surrounding soils experienced notable lateral deflection and *** bridge piles experienced significant settlement since the excavation commenced,which might be attributed to the inherent deficiency in geological condition and pile *** soil disturbance induced by the adjacent deep excavation accelerated bridge *** finite element analysis revealed that the excessive settlement of the bridge piles and ground surface resulted from confined-water withdrawal in sand layers.

关键词： Deep excavation MJS treatment Pile-foundation Karst region confined-water

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