Comparative Analysis of the Lateritic Soil of Brasília and Soil Mixed with Vermiculite for Urban Cavities

• 作者: Bruno de Castro Biill Neusa Maria Bezerra Mota Sonny Albert Amorim da Silva
• 来源期刊: 土木工程与建筑:英文版
• 学科: 农学
• 关键词: SOIL MIXED with VERMICULITE RECONSTITUTION of CAVITIES reduction of specific density
• 年，卷（期）: tmgcyjzywb_2020,（7）
• 页码范围: 385-390
• 页数: 6页
• 分类号: S15

摘要

Civil construction has high demand for new procedures and technologies capable of generating better results in numerous situations throughout the process.Nowadays,cavities in urban areas are commonly used due to the implantation of commercial and residential developments with more than two floors,seeking a better use of the nobler areas of the big cities.In geotechnical terms,the filling of these cavities,with the local soil,especially in the Federal District,lateritic soils,can represent additional efforts for the structures and foundations and lead to a compromise of the technical and functional performance of the same,compromising the efficiency and the economy of the enterprise.In this sense,this research evaluates the mechanical behavior of the mixtures,using GEO5 Software,Containment Design and Verification Modules,presenting an alternative to fill cavities in urban regions,with a mixture of material with lower specific density in relation to the soil Natural.Proctor Normal compression tests,simple direct shear saturation and sample expansibility were performed.The results showed a reduction of 38%in the strength of the reinforced concrete curtain,as well as a 25%reduction in maximum bending moments and 31%in maximum shear forces,and a reduction of about 32%in the displacements of the structure to the soil with addition of expanded vermiculite for tests obtained in the saturated condition.For the compositions of cement soil,expanded vermiculite soil and soil cement and expanded vermiculite,the deformations were of the order of 0.3%,0.4%and 0.2%,respectively.