Typical geotechnical profiles of the main soil deposits found in the Maceio city, Alagoas, from SPT boreholes

Santos, Juciela Cristina dos; Coutinho, Roberto Quental; Marques, Juliane Andréia Figueiredo

doi:10.28927/SR.2022.000122

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Article • Soil. Rocks 45 (4) • 2022 • https://doi.org/10.28927/SR.2022.000122 copy

Typical geotechnical profiles of the main soil deposits found in the Maceio city, Alagoas, from SPT boreholes

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This work had as objective to carry out the construction of typical soil profiles of the main existing deposits in the city of Maceio from a database of SPT boreholes, built in GIS environment. In total, 1,686 records of drilling were specialized in sediments of the Barreiras Formation, Coastal Deposits, and lagoons-river, presenting the most frequent characteristics, exemplified through representative profiles. The Barreiras Formation, which covers about 75% of the urban area of the city, presented profiles with a predominance of clayey, without water level records. The deposits lagoons-river, located in the vicinity of Mundaú lagoon, were characterized by the significant presence of soft and organic clays, sometimes peat, it can reach large thicknesses and with the water table rising in certain regions. In the coastal plain, where the highest vertical construction indices in the city are concentrated, it presented an area with a predominance of fine to medium sand, with or without silt, and a water table varying between 1,00 m and 5,00 m. The analysis also allowed for the identification and mapping of the occurrence of limestone rock, sandstone rock, soft and organic clay rocks in the coastal plain, presenting a typical profile of their occurrence, helping to understand the geotechnical behavior of these materials in the studied region.

Keywords:
Barreiras formation; Typical profile; Limestone; Sandstone; Organic clay

Layers	Group	Occurrence	Material Classification
1^st	G04	51% Clay + Sand + Silt	Gray, yellow, orange-red and variegated colours, medium consistency, occurring pebbles (pebbles).
	G02	30% Clay and Clay +Silt	Colours yellow, sometimes gray, orange-red and variegated, soft to hard with the occurrence of pebbles.
	G01	11% Sand and Sand +Silt	Gray, yellow, cream and orange-red colours, fluffy to medium compact, with gravel, pebble, and clay nodules.
	G03	8% Sand +Clay + Silt	Gray, yellow, and cream colours, fluffy to little compact, with gravel and clay nodules.
2^nd	G02	59% Clay and Clay +Silt	Colours yellow, gray and orange-red, soft to hard, with little occurrence of gravel.
	G04	29% Sand +Clay + Silt	Orange-red and yellow colours, medium compact to hard, with the occurrence of gravel and rusty concretions.
	G03	10% Clay + Sand + Silt	Yellow and orange-red colours occurring gray, soft to hard, with gravel and ferruginous concretions.
	G01	3% Sand and Sand +Silt	Yellow, red-orange, cream, grey and mottled, medium compact to compact, with clay and gravel nodules.
3^rd	G04	58% Clay + sand + Silt	Colours orange-red, yellow, gray and mottled, medium compact, with gravel (pebble) and ferruginous concretions.
	G02	26% Clay and Clay +Silt	Red-orange, yellow and variegated colours, medium to hard consistency, with gravel and ferruginous concretions.
	G03	13% Sand + Clay + Silt	Orange-red, yellow and gray colours, medium compact to compact, with gravel and ferruginous concretions
	G01	2% Sand and Sand +Silt	Yellow, grey, orange-red and cream, fluffy to very compact, with gravel and clay nodules occurring
4^th	G04	42% Clay + Sand + Silt	Red-orange and variegated colours, occurring yellow and gray, hard to hard, occurring pebbles (pebbles) and ferruginous concretions.
	G02	32% Clay and Clay +Silt	Colours variegated, orange-red, yellow, and grey, soft to hard, with gravel and ferruginous concretions.
	G03	22% Sand +Clay + silt	Red-orange and yellow colours, medium compact to hard, with possible gravel (pebbles) and rusty concretions.
	G01	4% Sand and Sand +Silt	Yellow, gray and orange-red colours, medium compact to hard, clay nodules and little gravel may occur
5^th	G04	43% Clay and Clay +Silt	Colours reddish orange variegated and yellow, hard, with gravel (pebbles) and ferruginous concretions.
	G02	41% Clay + Sand + Silt	Colours red orange, mottled and yellow, hard to hard, occurring pebbles (pebbles).
	G01	12% Sand +Clay + Silt	Red-orange and yellow colours, compact to very compact, with gravel.
	G03	4% Sand and Sand +Silt	Colours yellow and orange red, compact to very compact, with gravel.

Layers	Class	Occurrence	medium width (m)	Material Classification
Layers	Class	Occurrence	medium width (m)	color	consistency	note
1^st	Sandy Silt	-	2.3	Yellow, ligth gray, dark gray, brown and red orange	Fluffy, medium compact	construction waste (26%), crustacean fragments (7%), clay nodules (2%), boulder (pebbles) (6%)
	Fine Sand with Silt	49%
	Fine to Medium Sand	30%
	Limestone Sand	-
	Limestone	-
	Clay and Clay+Silt+Sand	16%
2^nd	Sandy Silt	12%	3.4	Yellow, light gray, dark gray, cream and brown.	Fluffy, medium compact	Resíduos da construção (2%), fragmento de crustáceo (7%), pedregulho (seixo) (6%)
	Fine Sand with Silt	57%
	Fine to Medium Sand	20%
	Limestone Sand	3%
	Limestone	2%
	Clay and Clay+Silt+Sand	8%
3^rd	Sandy Silt	23%	3.4	Yellow, ligth gray, dark gray, cream.	Fluffy, medium compact	Resíduos da construção (2%), fragmento de crustáceo (33%), pedregulho (seixo) (10%).
	Fine Sand with Silt	38%
	Fine to Medium Sand	26%
	Limestone Sand	3%
	Limestone	2%
	Clay and Clay+Silt+Sand	9%
4^th	Sandy Silt	20%	3.4	Yellow, ligth gray, dark gray, cream.	Fluffy, medium compact	Fragmento de crustáceo (27%), pedregulho (seixo) (13%), nódulo de argila (3%)
	Fine Sand with Silt	54%
	Fine to Medium Sand	14%
	Limestone Sand	4%
	Limestone	7%
	Clay and Clay+Silt+Sand	8%
5^th	Sandy Silt	13%	3.62	Yellow, ligth gray, dark gray, cream.	medium to very compact	Fragmento de crustáceo (13%), pedregulho (seixo) (15%), nódulo de argila (6%)
	Fine Sand with Silt	30%
	Fine to Medium Sand	30%
	Limestone Sand	9%
	Limestone	2%
	Clay and Clay+Silt+Sand	19%

Layer	W.L. (m)	Material Classification		Nspt medium
Layer	W.L. (m)	Class	consistency	Nspt medium
1^st	2.00	Fine Sand with or without silt	Fluffy to medium compact	1 - 10
2^nd		Soft clay or Organic Soil (peat)	Very soft	0 - 1
3^rd		Silt Sand, with or without clay	Medium compact to little compact	4 - 15
4^th		Sand clay or Silt clay	Medium to hard	6 - 12
5^th		Fine Sand with or without clay	Medium compact	15 - 18

Associação Brasileira de Mecânica dos Solos Av. Queiroz Filho, 1700 - Torre A, Sala 106, Cep: 05319-000, São Paulo - SP - Brasil, Tel: (11) 3833-0023 - São Paulo - SP - Brazil
E-mail: secretariat@soilsandrocks.com

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[1] #Corresponding author. E-mail address: juciela.santos@ceca.ufal.br