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No-dig technology as a prevention

No-dig technology as a prevention

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There were very intensive rainy periods in Europe and in Hungary as well in the years 1999-2000 and 2003-2004.Following these rainy periods large scale landslides occurred on the riverbank areas where clay, silt, loessic, fine/medium sand layers had been settled in different geological periods in a slight slope towards a creek or a river creating a multi-layer composite soil structure.There are higher level background water collector areas in the neighborhood of the riverbanks threatened with landslides, where the rainfall can infiltrate into this multi-layer soil structure and this is the main supply of the groundwater there.Because of the slight slope the groundwater is continuously streaming in the permeable soil layers of this multi-layer soil structure from the higher level background water collector area towards the river or creekUnder normal meteorological conditions (at average rainfall) the groundwater discharge and outflow capacity of the permeable layers in this composite soil structure at the riverbanks is equal or higher than the volume of the streaming groundwater arrives from the background water collector areas.In this case the whole multi-layer soil structure is in stable, positive balanced condition.In certain cases either the volume of the streaming groundwater increases suddenly and enormously (e.g.: extreme rainfall, more intensive infiltration possibility of the rainwater into the soil on the water collector areas, damage of the public utility lines, etc.), or the discharge/outflow capacity of the permeable layers decreases dramaticallyThere is no more positive balance between the volume of the streaming groundwater and the discharge/outflow capacity of the permeable layers.In this case the piezometric pressure in the streaming groundwater turns to a much higher level, the uplifting force increases, the water content at the contact surface of the very sensitive silt and clay layers comes to a critical figure where the passive resistance of these soil layers against sliding dramatically reduces, practically ceases.The whole multi-layer soil structure comes to an unstable situation and starts to slide. This paper intends to present a peculiar application of the No-Dig technologies (deep bored subsurface drainage system) on the field of environmental protection, especially at the prevention of certain type of landslides.


Parameters: Conference Papers
Author:  Istvan Szemesy
Year:  2005
Event:  Intl No-Dig-2005-Rotterdam


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