Barreras de Flujo de Detritos

Las alcantarillas que tienen el trabajo de desalojar el agua de los escurrimientos fueron interrumpidas por el arrastre de sólidos como rocas, troncos, ramas de árboles y suelos finos. El agua de lluvia se almacenó en los terraplenes generando reblandecimiento del suelo y con ello desplazamientos y oquedades las cuales se vieron reflejadas en la carpeta de rodamiento, lo anterior causó pérdidas económicas importantes debido a la interrupción en la operación de la autopista Cuernavaca Acapulco.

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Turkey experiences most of its avalanches and debris flows in the northeast part of Anatolia, a region replete with mountains, valleys and rivers. These events of nature interrupt transportation and communication lines, let alone their potentially deadly impact on life and loss of property. Contributing to their frequency is land use in the forms of new roads and railways, new residential developments and the expansion of arable farming lands, in addition to the effects of climate, geology and hydrology. The denuding of forested areas for human purposes exposes soils to nature’s elements triggering sliding movements of soil pulled by gravity downward seeking equilibrium. Particularly troublesome are steep slopes with high permeability and water volume discharge rates. Deposits form by debris particles moving down the slope. In some cases the speed of this movement can be so slow as to be almost imperceptible. Additionally, water seeping into the deposits freezes and thaws during winter months being finally released from this cycle in Spring. This freezing and thawing of water expands and contracts the deposits generating weathering particles that travel down the stream bed with the effect of gravity. The mass of the debris material in the flows can move from 8-10 cm to several meters per event. Moreover, highways and railways in slope areas particularly prone to debris flows experience flooding, mudslides and wash outs.

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Discovery Bay is a high-end mixed development situated on Lantau Island, New Territories Region. It is privately developed by Hong Kong Resorts Co. Ltd. (HKR) since 1982. Prior to rapid development at Discovery Bay, the existing terrain is mountainous and there has been incidents of debris flow recorded in the past, near to the development area. To address possible debris flow safety concerns, interception structures on hill slopes shall be provided to capture loose debris, safeguard infrastructure and lives in the event of landslip. HKR has awarded the construction works package for the Discovery Bay North Development to China State Construction Engineering (HK) Ltd (CSCE). For the scope of debris flow barrier design, supply and construct, CSCE engaged G And E Co. Ltd. (G&E) as the specialist contractor to come up with the solution which meets the authorities requirements. Rockfall simulations has been performed and the impact energy identified for open hill slope debris flow is 2,000kJ and channelized debris flow is 5,000kJ. The fence will be located near to the coast, beside Sam Pak Wan Bay, hence needs to be able to withstand salt spray attack.

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