Study on Drainage Patterns of 100-meter-level Homogeneous Earth Dams
Dam drainage design is one of the important tasks in earth-rock dam engineering design.Reasonable arrangement of the dam drainage pattern,drainage elevation and range can effectively reduce the dam infiltration line,control dam seepage,increase the stability of the downstream dam slope,and prevent seepage failure.At present,there is still a lack of successful engineering experience in the drainage design of homogeneous earth dams with dam heights exceeding 70 m in China.In order to solve the problems of unreasonable drainage pattern design in the dam and defects in the drainage scheme design,relying on a project under construction,different drainage pattern combinations are drawn up at different elevations and locations in the homogeneous earth dam body,and the drainage is studied through numerical simulation analysis.The impact of the drainage system on the infiltration line of the dam body and the stability of the dam slope is analyzed,and the optimal drainage pattern(vertical drainage+horizontal drainage+prism drainage)suitable for 100-meter-level homogeneous earth dams is proposed.The results show that for a 100-meter-level homogeneous earth dam with a high normal wa-ter level downstream of the dam,vertical drainage+horizontal drainage+prism drainage can be the best drainage pattern,and the verti-cal drainage structure is set in the middle and lower reaches of the dam body and is tilted upstream.Considering the construction quality,the slope of the upstream tilt should be 1∶0.5.However,for this type of combined drainage,the applicable scope of the dam seepage anisotropy kx/kz needs to be calculated and analyzed based on specific projects.The study results can provide reference for the drainage design of 100-meter-level homogeneous earth dams.
国家科技期刊平台
NSTL
万方数据
维普
