Влияние возрастания характеристик грунтов в основании реконструируемых зданий на их осадку при устройстве подземной части

Н. С. Никифорова, Н. С. Семенов
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Abstract

Introduction. With the time of operation of buildings and structures, soil compaction occurs under the base of their foundations from all the acting loads from the building. The purpose of the research is to study the movements of the building foundations during the construction of the underground part with their possible preventive reinforcement during reconstruction, taking into account changes in the strength and deformation characteristics of soils. The solution of this problem will allow the most detailed consideration of buildings settlement during reconstruction. Materials and methods. A series of numerical calculations in the PLAXIS 2D software package of the interaction of the foundation with the foundation soil during the reconstruction of a building with the development of underground space, including the construction of two or three underground floors, were carried out. Results. The effect of taking into account the improved soil characteristics with regard to the time of building operation on the settlement of existing foundations during reconstruction with the development of underground space is studied. It was revealed that the reinforcement of foundations with soil-cement elements reduces the settlement during reconstruction approximately in two times. The influence of the number of floors of the designed underground car park on the stress-strain state of the soil massif is considered. Conclusions. Numerical studies show that strengthening of soils under the base of existing foundations leads to a decrease in the building settlement during reconstruction with the development of underground space. Reinforcement of the existing foundation with soil-cement elements makes it possible not to exceed the maximum additional settlement of the reconstructed building. A decrease in the settlement of existing foundations with a decrease in the number of storeys of the designed underground part is revealed.
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地下建筑基础上土壤特性上升的影响,取决于地下建筑的沉积物。
介绍。随着建筑物和构筑物的使用时间的延长,在建筑物的所有作用荷载作用下,其基础下部发生了土体压实。本研究的目的是在考虑土体强度和变形特性变化的情况下,研究地下部分施工过程中建筑物基础的运动及其在改造过程中可能进行的预防性加固。这一问题的解决将使重建过程中最详细地考虑建筑物的沉降。材料和方法。在PLAXIS 2D软件中,对地下空间开发后的建筑物重建过程中,包括地下两层或三层的重建过程中,地基与地基土的相互作用进行了一系列数值计算。结果。研究了随着地下空间的发展,在改造过程中,考虑建筑施工时间对土质特性的改善对既有基础沉降的影响。结果表明,采用水泥土单元加固地基可使重建过程中的沉降减少约两倍。考虑了地下停车场层数对土体应力-应变状态的影响。结论。数值研究表明,随着地下空间的发展,在改造过程中,对既有基础基底下的土体进行加固可以减小建筑物的沉降。用水泥土构件加固现有基础,使其不超过重建建筑的最大附加沉降。随着地下部分设计层数的减少,现有基础的沉降也随之减少。
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