Cutter Soil Mixing Solutions in Portugal

Pinto, Alexandre; Tomásio, Rui; Pita, Xavier; Pereira, A.; Peixoto, Artur

doi:10.1061/9780784412350.0017

Cited by 3 publications

(3 citation statements)

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“…При проектуванні основ і фундаментів новобудов за умов щільної міської забудови оцінюють вплив нового будівництва на напружено-деформований стан (НДС) навколишнього масиву, зокрема, й основ і фундаментів наволишніх об'єктів. Якщо розкриття котлованів з вільними відкосами під новобудови не можливо обгрунтувати аналітичними чи чисельними розрахунками [1][2][3][4][5][6][7], то враховуючи інженерно-геологічні й гідрогеологічні умови ділянки, технічний стан існуючих будівель, конструктивні, організаційно-технологічні, економічні та інші чинники, приймають огородження котлованів різних видів і технологій [8][9][10][11][12][13][14][15], найбільш популярні з яких наступні:…”

Section: аналіз попередніх дослідженьunclassified

The practice of arranging a pit deeper than the level of the soles of the foundations of the surrounding buildings

Vynnykov,

Akopian

2023

B&F

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A rational constructive-technological decision to arrange a fence of a deeper pit for a new building than the depth of laying strip foundations of the surrounding buildings has been substantiated and tested in practice. The decision to arrange the fence was tested based on the results of complex experimental and theoretical studies under the conditions of a wet loess massif. At same time, regulatory restrictions on additional subsidence of these buildings foundations are provided. It has been proven that the additional subsidence of existing objects did not exceed the permissible values according to the norms. This happened due to the arrangement of the pit fence, the phasing of soil extraction in the initial stages under of the soil berm protection. The technology provided for the construction of a pit fence with sheet piling (I-beam No. 30) with a step of 1 m, with timber lagging between them. Then they installed the capping beam, struts, rakers and gradually raised the floor and outer wall of the parking lot of the new building. The results of long-term geodetic observations of the foundations deformations of buildings located in the zone of the pit influence of the new building at various construction stages of its enclosure are described. Sufficient convergence of the simulation results in the plane condition using the FEM and field studies was determined (the relative error did not exceed 20%). An elastic-plastic soil model of the "basement - foundations of an existing building - pit enclosure" system was used for modeling. The article describes examples of the results of FEM modeling of soil massif deformations at various stages of pit fence construction. It was determined that during construction the largest horizontal movements of the pit fence vary from 8 to 23 mm in the area of existing buildings.The maximum vertical movements of the bases foundations of these buildings amounted to 10 mm, which does not exceed the permissible values according to the norms. Prospects for further research on assessing the level of reliability of the pit enclosure by determining the variability parameters of the components of the system "foundation - foundation of the existing building - pit enclosure" have been determined.

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Section: аналіз попередніх дослідженьunclassified

The practice of arranging a pit deeper than the level of the soles of the foundations of the surrounding buildings

Vynnykov,

Akopian

2023

B&F

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“…It offers many advantages, such as seepage prevention, soil retaining, foundation engineering, and geological improvement [7][8][9][10][11][12]. The CSM approach for excavating multi-span foundation pits offers several benefits, including high construction efficiency, suitability for complex site conditions, precise verticality control, effective anti-seepage measures, low soil replacement rates, and environmentally friendly practices [13][14][15][16][17][18][19][20]. The quality of the deep foundation pit wall is raised to a new level by using the CSM construction method with new materials.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Multi-span Pit Excavation on Supporting Structures Based on the Cutter Soil Mixing Method

Wu,

Shan,

Liu

et al. 2023

Sustainability

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The Cutter Soil Mixing (CSM) method, a relatively recent innovation, employs twin-wheel milling and profound agitating machinery for wall construction. In an endeavor to scrutinize the displacements and internal support stresses to the support structure during the excavation of a multi-span foundation pit founded upon the CSM method, a two-dimensional finite element model was established, utilizing the Midas GTS NX 2019 V1.2 finite element software. This model was grounded on a multi-span foundation pit excavation endeavor situated in the eastern expanse of China, where steel bracing and the CSM method assumed the preeminent mantle of support. A comprehensive scrutiny encompassed ten distinct working conditions, each juxtaposed and dissected to ascertain the displacements affecting the CSM wall and the forces exerted upon the support system during the foundation excavation process. The research findings manifest a certain interplay between the embedment depth of the CSM wall and the span of the pit excavation in shaping the displacement and support stresses within the supporting structure. While deeper embedment augments the potential for enhanced support outcomes, its efficacy remains constrained. As the embedment depth increases, the internal support moment and lateral displacement of the wall increase slightly. Taking a pit with a shallow embedded CSM wall as an example, wherein both the lateral and vertical displacements experience an ascent followed by a descent, culminating at the juncture of a four-span pit. Likewise, the axial force and bending moment exerted upon the steel supports undergo a similar trajectory, culminating with a two-span pit as the threshold. At the five-span, the maximum lateral displacement of the CSM wall exceeds that observed at the two-span by an increment of 21.14%. These findings offer invaluable insights into the embedment depth of diaphragm walls and the span of pit excavations, wielding profound implications for future undertakings akin to the foundation pits in question.

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“…Among the structural and technological solutions for the enclosure of pits for new buildings, the following have proven themselves to be the most reliable and effective: sheet metal fences (metal, reinforced concrete, wooden, plastic flat or profile retaining walls, the stability of which is provided by deep walling in the soil or in combination with soil anchors, soil nails, struts, rakers, etc.). Soil berms and unloading trenches have become quite effective as a supplement to the sheet pile fence under conditions of weak soils [8]. However, this option has a limit on the depth of pits to 5-6 m; enclosure of the "wall in the soil" type, which also makes it possible to arrange pits of considerable depth [9].…”

Section: Introductionmentioning

confidence: 99%

Subsidence of Existing Buildings from the Impact of New Construction

Vynnykov,

Kharchenko,

Yermolenko

et al. 2023

Construction Technologies and Architecture

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The article describes the methodology and results of geodetic observations of additional subsidence of two residential buildings with strip foundations on moist loess soil. Next to them, a pit was dug for the new building, which was deeper than the level of the soles of these foundations. The authors proved that of arranging the pit fence ensured the fulfillment of regulatory requirements for not exceeding the maximum allowable values of foundations of existing buildings by additional subsidence. The technology provided for the construction of a pit enclosure with sheet piling (I-beam No. 30) with a step of 1 m, with timber lagging between them. At the same time, the phasing of soil extraction in the initial stages under the protection of a soil berm was maintained. Then they installed the capping beam, struts, rakers and gradually raised the floor and outer wall of the parking lot of the new building. Sufficient convergence of the simulation results in the plane condition using the finite element method and field studies was determined. An elastic-plastic soil model of the "basement - foundations of an existing building - pit enclosure" system was used for modeling.

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Cutter Soil Mixing Solutions in Portugal

Cited by 3 publications

References 0 publications

The practice of arranging a pit deeper than the level of the soles of the foundations of the surrounding buildings

The practice of arranging a pit deeper than the level of the soles of the foundations of the surrounding buildings

Study on the Effect of Multi-span Pit Excavation on Supporting Structures Based on the Cutter Soil Mixing Method

Subsidence of Existing Buildings from the Impact of New Construction

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