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california bearing ratio
- Definição1
- One of the methods used to evaluate different soil conditions, which consists of dropping a plunger or cone of a specified area and weight from a predetermined height. The measured penetration of the plunger or cone into the soil is plotted on a graph providing a CBR reading by putting a figure on the inherent strength of the soil.
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Airport services manual: part 5: removal of disabled aircraft. 4th ed. Montreal, 2009. (Doc. 9137 AN/898).
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Airport services manual: part 1: rescue and firefighting. 4th ed. Montreal, 2015. (Doc. 9137 AN/898).
- Nota Adicional1
- The CBR test measures the load necessary to force a plunger or penetrometre into a soil sample, thus identifying the inherent strength of the soil.
- Nota Adicional2
- Acronym in English: CBR.
- Contexto
- Aircraft manufacturers consider that a depth of 15 cm is the maximum depth to which the nose gear may sink without collapsing. Therefore, it is recommended that the soil at a depth of 15 cm below the finished strip surface be prepared to have a bearing strength of California Bearing Ratio (CBR) value of 15 to 20. The intention of this underlying prepared surface is to prevent the nose gear from sinking more than 15 cm. The top 15 cm may be of lesser strength which would facilitate deceleration of aircraft.
- Subárea
- Airport Infrastructure
- Français
- indice portant californien