Geo-Textile Sand Container Mattresses (GSCM) Lining for Temporary River Diversion Channels

摘要

HCC (Hindustan Construction Co. Ltd) has been a leading construction industry in India sincern1926. For about 80 years, HCC has led the way in engineering construction. The company hasrnmade landmark contributions in the field of Power, Water, Transportation, Tunneling,rnEnvironmental engineering and Industrial Construction. HCC exceeds in undertaking all types ofrnlarge Civil engineering and Infrastructure projects, and has the capability inrnEngineering and design Research and developmentrnProcurement Construction and commissioningrnOperation and maintenance Project managementrnHCC has innovated new method of lining of temporary river diversion channels. Temporaryrnriver diversion work is a very important part of all river valley projects. The river is required to berndiverted so as to facilitate the construction of the hydraulic structure, like dam or barrage, acrossrnthe valley in the course of project execution. In most of the projects, diversion through an openrnchannel is the easiest and most economical option.rnThe diversion channels are designed and constructed for a functional period of 1 to 3 yearsrndepending upon the type and size of the project. These channels are required to carry monsoonrnand non-monsoon river discharge safely without hampering or endangering construction activity.rnConstruction of diversion channels is carried out in non-monsoon lean flow period. Largernquantity of excavation is required to be done which consumes major part of available timernleaving very short time period for execution of lining work.rnTraditionally, diversion channels are lined with (rip rap) boulders, 600 to 800 mm thick, inrnconcrete ribs. Well graded sand filter of thickness varying from 300 to 600 mm is provided belowrnthe boulders. Collection of large quantity of boulders, its transportation to the site and stackingrnin a very short time frame involves unavoidable delays and higher costs. In some cases, like thernone faced by HCC at Teesta hydro-electric project, the unavailability of the boulders itself wasrnthe bottleneck in lining constructing.rnConsidering the constraints associated with this traditional design, a need was felt to develop anrneconomical, speedy and reliable method of lining. Geo-Textile Sand Container Mattressesrn(GSCM) Lining was conceived, designed and installed for the Teesta IV Hydro electric projectrnby HCC.rnThe paper discusses the design approach, adoption of design for different soil conditions,rnconstruction methodology, performance review (over a short time period) and economics of thernGSCM lining.