Abstract
For the support engineering of the deep and large foundation pit (DLFP) due to tomb protection, there are still no clear standards. The construction of DLFP will introduce large-range transverse and longitudinal disturbance on the stratum; therefore, it should be reinforced. In this paper, the reinforcement of the deep and large foundation pit of a national first-class key tomb protection project is studied. By comparing the existing supporting scheme and the stress conditions of the reinforced tomb, the combination reinforcement scheme by bored pile and pile slab retaining wall is found to be safe and feasible. Furthermore, according to the simulated bending moment, displacement, and axial force of the tomb by numerical analysis, an economic and reasonable mixed anchor support scheme is selected. In order to ensure the stability of the tomb during the supporting process of the foundation pit, a maximum value of 10 mm for the overall settlement of the tomb can be treated as the control benchmark based on the support and anchorage schemes in each specification and the in-site measured settlement values of the tomb. The determined support, anchorage schemes, and the control benchmark can provide certain technique guidance and research significance for the protection of similar ancient buildings in the future.
Highlights
From the twenty-first century, relative specifications put forward clear requirements on the support effects of the foundation pit and their influence on the surrounding environment, and the conventional design calculation for general foundation pit support is already mature
The controlled settlement due to repair of the ancient buildings, ancient tombs, and other cultural heritages protected by the state is mainly based on the experience of experts. e control benchmark of settlement is higher and higher, and some key protection projects even require zero settlement. e increment of the benchmark can better provide the cultural relic from destroying, but it increases construction difficulty and cost
According to the protection requirements of isolated ancient buildings in soft soil deep foundation pit engineering, Gong et al [2] simulated various construction conditions of foundation pit excavation by using PLAXIS finite element software and determined the support mode that can effectively control the deformation of isolated ancient buildings
Summary
From the twenty-first century, relative specifications put forward clear requirements on the support effects of the foundation pit and their influence on the surrounding environment, and the conventional design calculation for general foundation pit support is already mature. The conventional single support type is difficult to meet the design requirements of the foundation pit of ancient tombs, which have complex surrounding environment, strict support effect demand, and large depth and area. According to the protection requirements of isolated ancient buildings in soft soil deep foundation pit engineering, Gong et al [2] simulated various construction conditions of foundation pit excavation by using PLAXIS finite element software and determined the support mode that can effectively control the deformation of isolated ancient buildings. Chen [14] optimized the supporting system and the reinforcement scheme of the pit bottom through the characteristics of the ancillary structure of the station close to the old City God Temple of the historical building According to this scheme, the deformation of the old City God Temple has been effectively controlled to ensure the smooth progress of the project. In order to ensure the safety of the foundation pit and the site not be damaged during excavation, the proper enclosing structure of the foundation pit and support structure of the earthen ruins should be selected, and the proper water stop curtain should be selected to avoid the damage of the antiquities due to excessive settlement
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