Technological settlement due to protection of the existing buildings

• Published in: IOP conference series. Materials Science and Engineering 2020-07, Vol.896 (1), p.12026
• Main Authors: Nikiforova, N S, Konnov, A V
• Format: Article
• Language: English
• Subjects: Building construction; Buildings; Jet grouting; Micro piles; Settlement analysis; Soft soils
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/896/1/012026

Values of technological settlement caused by technological impacts during protective measures installation were obtained for existing buildings in the zone of deep excavation influence. Neglecting the technological part in settlement prediction of adjacent buildings can lead to their unserviceability. The technological settlement was determined by following methods: geodetic measurements of buildings settlements, numerical modelling and analogy method. The technological settlement was determined for 4 types of geological conditions that can be applied to geo conditions of Moscow and soft soils of St. Petersburg and Hanoi (Vietnam). The authors recommend values of technological settlement for the underpinning with micropiles, jet-grouting columns, the installation of a jet-grouting cut-off wall and changing a foundation type to a slab. A formula is given for the calculation of technological settlement along the building due to changes in a protection design. A satisfactory converge of predicted settlements of buildings in the influence zone of deep excavations considering technological part with geodetic measurements data was achieved for construction projects in Moscow and St. Petersburg. Obtained values of technological settlement made it possible to propose recommendations on choice of protection measures ensuring safety of adjacent buildings.