Stability of Geotextile Cofferdam Considering the Riverbed Scouring and Differences of Water Level
Although geotextile tube cofferdams offer the advantages of low construction costs and ease of implementa-tion,their operational lifespans are frequently marred by engineering accidents such as foundation sliding instability and tensile failure of the geotextile tubes.These accidents are often precipitated by the combined influence of complex geolog-ical conditions and water level fluctuations.This study is anchored on a geotextile tube cofferdam project situated at a spe-cific estuary of the Qiantang River.Utilizing a movable bed flume model and a numerical model for the geotextile tube cofferdam,we ascertained the distribution characteristics of foundation plastic strain and geotextile tube tensile forces un-der different tidal conditions.Employing the allowable stability coefficient and the tensile strength of the geotextile mate-rial as control parameters,the critical conditions for the overall stability of the geotextile tube cofferdam was identified from the perspectives of both foundation sliding instability and geotextile tube tensile failure.The findings reveal that when the foundation scouring depth is within 3 meters,the stability coefficient remains above 1.16.However,as the scouring depth increases,tensile failure of the geotextile material becomes inevitable.When the scouring depth reaches 5 meters,the stability coefficient of the foundation decreases to 1.1,and tensile failure of the geotextile tube material can no longer be averted.
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