ESTUDIO DE LA SUBRASANTE PARA PAVIMENTOS

ESTUDIO DE LA SUBRASANTE PARA PAVIMENTOS

ESTUDIO DE LA SUBRASANTE PARA PAVIMENTOS

El presente Informe comprende el Estudio de Suelos llevado a cabo con la finalidad de determinar las características del perfil del subsuelo, la subrasante y las condiciones de pavimentación en el tramo comprendido.

El programa de exploración de campo llevado a cabo consistió en la ejecución de cinco calicatas excavadas en forma manual hasta 1.50 m de profundidad con respecto a la superficie actual de la calle, y ensayos de densidad de campo para determinar la compactación al nivel de la subrasante.

El perfil del suelo registrado en las calicatas bajo el pavimento existente y hasta 1.50 m de profundidad, está conformado por estratos intercalados de suelos finos:

– Arcilla limosa, de plasticidad baja a media, medianamente compacta;
– Limo arcilloso, arenoso, de plasticidad baja, medianamente compacto; y
– Arena fina limosa, medianamente densa

En las calicatas efectuadas no se detectó el nivel de la napa freática. Los suelos más desfavorables y que predominan al nivel de la subrasante, son las arcillas y limos de plasticidad baja a media, medianamente compactos. A estos suelos le corresponde un valor de CBR de 7, un módulo elástico (Mr) de 7,500 psi y un módulo de reacción de la subrasante (k) de 170 lb/pulg3, que equivale a 4.70 Kg/cm2 x cm.

Con respecto a la compactación de la subrasante existente en los ensayos de densidad de campo realizados se han obtenido valores comprendidos entre 91 y 93% de la máxima densidad seca del ensayo proctor modificado en las calicatas C-1 y C-2; y valores comprendidos entre 95 y 96% en las calicatas C-3, C-4 y C-5 excavadas.

Cabe señalar, que la subrasante debe estar compactada a un mínimo del 95% de la máxima densidad seca del ensayo proctor modificado, siendo la tolerancia 92.5%.

PAVIMENTOS EXISTENTES

El pavimento está conformado por las siguientes capas:

– Adoquines de concreto de 5 a 6 mm de espesor.
– Cama de arena de 0.10 m de espesor en las calicatas C-1 y C-2 y 0.05 m en la calicata C-3.
– Base de afirmado de 0.10 m de espesor sólo en la calicata C-1. En la calicata C-2 la cama de

arena se encuentra directamente sobre el suelo natural arcilloso y en la calicata C-3 existe un relleno de grava arenosa limosa, con pedazos de ladrillos de 0.10 m de espesor, que no puede considerarse como base.

El pavimento está conformado por las siguientes capas:

Calicata C-4

– Carpeta asfáltica de cobertura: 0.07 m
– Losa de concreto simple: 0.13 m
– No tiene base granular. Las losas se apoyan directamente sobre la subrasante natural limo
arcilloso.

Calicata C-5

– Carpeta asfáltica de cobertura: 0.07 m
– Losa de concreto simple: 0.18 m
– No tiene base granular. Las losas se apoyan sobre un relleno de 0.15 m de espesor de grava arenosa, arcillosa, limosa, con restos de desmonte, que no se puede considerar como base, tanto por encontrarse contaminada por desmonte, como por no alcanzar el porcentaje de compactación recomendado para capas de base granular (96%, siendo el valor recomendable 100% de la máxima densidad seca del ensayo proctor modificado).

 

                               👇COMPARTE AHORA Y DESCARGA GRATIS AQUÍ ABAJO👇

 

julio 12, 2018

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