Figure 1
Mineralogy of a soil profile from the Federal District, Brazil.
Figure 2
Microstructure of the interior of a laterite from the Federal District, Brazil.
Figure 3
Microstructure of soils along a weathering profile: deeply weathered soil (a, b, and c); moderately weathered soil (d); slightly weathered soil (e and f).
Figure 4
Lateritic aggregates from the Federal District and Goiânia, Brazil: (a) laterites with pores; (b) laterites without pores.
Figure 5
Estimated load capacity versus load test results on collapsible tropical soils in the Federal District, Brazil.
Figure 6
Effect of normalized stress state variables on: (a) NSPT; (b) maximum torque.
Figure 7
Results of static load tests on piles (modified from Rodrigues et al., 1998Rodrigues, A.A., Camapum de Carvalho, J., Cortopassi, R.S., & Silva, C.M. (1998). Avaliação da adaptabilidade de métodos de previsão de capacidade de carga a diferentes tipos de estacas. In Anais do XI COBRAMSEG (Vol. 3, pp. 1591-1598. Brasília.).
Figure 8
Shear strength envelopes of tropical soils.
Figure 9
Typical soil-water characteristic curves of soils from tropical weathering profiles.
Figure 10
Suction influence on the behavior of aggregated tropical soils (modified,
Valencia et al., 2007Valencia, Y.G., Santos, M.A.A., Camapum de Carvalho, J., Farias, M.M., & Gitirana Júnior, G.F.N. (2007). Una metodología simple para determinar la envolvente de resistencia al corte de suelos no saturados: resultados experimentales y validación. In Conferencia Panamericana de Mecánica de Suelos e Ingeniería Geotécnica, Isla de Margarita (pp. 710-715). Venezuela: SVDG & ISSMGE (in Spanish).,
2019Valencia, Y.G., Camapum de Carvalho, J., & Gitirana, G. (2019). Metodologias simples para determinar em solos parcialmente saturados a envoltória de resistência ao cisalhamento. Revista EIA, 16(32), 43-53. https://doi.org/10.24050/reia.v16i32.1218.
https://doi.org/10.24050/reia.v16i32.121...
)
Figure 11
Model of pore-volume distribution in laterites and lateritic soils: (a) concretion from Goiânia, Brazil; (b) concretion from the Federal District (DF), Brazil.
Figure 12
Impact of mineral expansion on the volume of solids.
Figure 13
Particle-size distribution curves of a highly weathered soil collected at 4 m in depth, Federal District, Brazil (Modified from Roseno & Camapum de Carvalho, 2007Roseno, J.L., & Camapum de Carvalho, J. (2007). Avaliação granulométrica de um perfil de solo tropical usando o granulômetro a laser. In Anais do III Simpósio sobre Solos Tropicais e Processos Erosivos no Centro-Oeste (pp. 136-147). Cuiabá, MT.).
Figure 14
Particle-size distribution curves of lateritic soils treated with lime: (a) modified from
Ayala (2020)Ayala, R.J.L. (2020). Melhoria de solos com fibras provenientes da indústria avícola [Doctoral thesis, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
; (b) modified from
Delgado (2007)Delgado, A.K.C. (2007). Estudo do comportamento mecânico de solos tropicais característicos do Distrito Federal para uso na pavimentação rodoviária [Doctoral thesis, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
.
Figure 15
Soil-water characteristic curves of pure lateritic soils and stabilized soils with lime (modified from
Rezende, 2003Rezende, L.R. (2003). Estudo do comportamento de materiais alternativos utilizados em estruturas de pavimentos flexíveis [Doctoral thesis, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
).
Figure 16
Soil-concrete interaction (Wanderley Neto, 2020).
Figure 17
Shear strength in the soil - concrete interface as a function of curing time (Wanderley Neto, 2020).
Figure 18
Load test on a ground anchor (modified from Silva et al., 2008Silva, C.M., Cordão Neto, M.P., Ribeiro, L.F.M., & Soares, E. (2008). Perda da capacidade de carga de tirantes executados na argila porosa de Brasília. In Anais do XIV Congresso Brasileiro de Mecânica dos Solos e Engenharia Geotécnica (pp. 367-372). São Paulo, Brasil: ABMS.).
Figure 19
Plasticity chart and tropical soil’s data under several conditions.
Figure 20
Relationship between the air-entry value transformed by the void ratio and the corrected plastic and liquid limits (modified from Camapum de Carvalho et al., 2017Camapum de Carvalho, J., Guimarães, R.C., Siddiqua, S., Bigdeli, A., & Barreto, P.N.M. (2017). Relação entre a plasticidade do solo e o ponto de entrada de ar na curva característica de retenção de água. In GEOCENTRO 2017 (pp. 734-739). São Paulo, Brasil: ABMS.)
Figure 21
Aggregate content as a function of: (a) plasticity index; (b) cation exchange capacity (modified from
Camapum de Carvalho et al., 2015bCamapum de Carvalho, J., Barbosa, M.C., Mendonca, R.M.G., Farias, W.M., & Cardoso, F.B.F. (2015b). Propriedades químicas, mineralógicas e estruturais de solos naturais e compactados. In J. Camapum de Carvalho, G.F.N. Gitirana Junior, S.L. Machado, M.M.A. Mascarenha, & F.C. Silva Filho (Orgs.), Solos não saturados no contexto geotécnico (pp. 39-78). ABMS. Retrieved in July 18, 2021, from https://www.abms.com.br/biblioteca/
https://www.abms.com.br/biblioteca/...
).
Figure 22
Influence of dispersion on the compaction and resistance of a lateritic soil (modified from Guimarães et al., 1997Guimarães, R.C., Camapum de Carvalho, J., & Farias, M.M. (1997). Contribuição ao estudo da utilização de solos finos em pavimentação. In Anais do I Simpósio Internacional de Pavimentação de Rodovias de Baixo Volume de Tráfego - I SIMBRATA (Vol. 1, pp. 469-478). Rio de Janeiro, Brasil.).
Figure 23
Influence of water quality on the compaction curve of tropical soils (modified from Coelho et al., 2016Coelho, J. A., Aquino, S. C. N., & Camapum de Carvalho, J. (2016). Análise da influência da qualidade da água na compactação de solos tropicais. In Anais do 45ª RAPv, 19º ENACOR (pp. 1-13). Brasília.).
Figure 24
Influence of sample drying on the optimal compaction condition (modified from
Pessoa, 2004Pessoa, F.H.C. (2004). Análise dos solos de Urucu para fins de uso rodoviário [Master’s dissertation, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
).
Figure 25
Effect of gravimetric water content on basal interplanar distance and on density of a bentonite (modified from Camapum de Carvalho et al., 2019Camapum de Carvalho, J., Silva, F.C., Barreto, P.N.M., Pérez, A.C., Guimarães, R.C., & Oliveira, R.B. (2019). Aspectos químico-mineralógicos e as propriedades e comportamento dos solos expansivos. In Anais do II GeoBASE - II Seminário Geotécnico Bahia/Sergipe (pp. 277-286). São Paulo, Brasil: ABMS.).
Figure 26
Compaction curves (modified from
Delgado, 2002Delgado, A.K.C. (2002). Influência da sucção no comportamento de um perfil de solo tropical compactado [Master’s dissertation, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
;
Consoli et al., 2020Consoli, N.C., Araújo, M.T., Ferrazzo, S.T., Rodrigues, V.L., & Rocha, C.G. (2020). Increasing density and cement content in expansive soils stabilization: conflicting or complementary procedures for reducing swelling? Canadian Geotechnical Journal, 58, 866-878. http://dx.doi.org/10.1139/cgj-2019-0855.
http://dx.doi.org/10.1139/cgj-2019-0855...
)
Figure 27
Analysis of swelling considering: (a) global parameters; (b) effective parameters.
Figure 28
Temporal effects of weathering near an erosion gully: (a) soil composition; (b) soil-water characteristic curves (modified from
Lima, 2003Lima, M.C. (2003). Degradação físico-química e mineralógica de maciços junto às voçorocas [Doctoral thesis, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
).
Figure 29
Accumulation of sediments as a function of the elapsed time and as a function of elapsed time normalized by the thermal variation.
Figure 30
Slope failures in excavations (Camapum de Carvalho et al., 2007Camapum de Carvalho, J., Valencia, Y.G., Santos, M.A.A., & Gitirana Junior, G.F.N. (2007). Estabilidad de un talud cóncavo considerando condiciones en 3D. In XIII Conferencia Panamericana de Mecánica de Suelos e Ingeniería Geotécnica (pp. 988-993). SVDG e ISSMGE (in Spanish).).
Figure 31
Formation of crystals by bacteria present in the soil (
Valencia, 2009Valencia, Y.G. (2009). Influência da biomineralização nas propriedades físico - mecânicas de um perfil de solo tropical afetado por processos erosivos [Doctoral thesis, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
).
Figure 32
SWCC and apparent cohesion of a soil in a natural state and modified by the action of bacteria (modified from
Valencia, 2009Valencia, Y.G. (2009). Influência da biomineralização nas propriedades físico - mecânicas de um perfil de solo tropical afetado por processos erosivos [Doctoral thesis, University of Brasília]. University of Brasília’s repository. https://www.geotecnia.unb.br/index.php/pt/producao-academica/teses-e-dissertacoes
https://www.geotecnia.unb.br/index.php/p...
).
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