Deformation mechanism and optimization analysis on joints between cutoff wall and connection plates of CFRD on ultra-deep overburden layer
For the safety concerns of joints in concrete faced rockfill dams(CFRD)built on ultra-deep weak overburden layers,research was conducted to optimize both deformation and stress.The deformation modes of the anti-seepage system including the cutoff wall,connecting slab,toe slab,and face slab were revealed.The weak points were identified.The optimization strategies were proposed,and the effects of the application were quantitatively assessed.The results indicate that the differential settlement between the cutoff wall and the toe slab is primarily concentrated at the joint between the cutoff wall and the connecting plate.Implementing mul-tiple connecting plates is ineffective in gradually mitigating this differential settlement.Lateral supports on the downstream side of the cutoff wall,inclined joints,and a support wall beneath the toe slab can contribute to reducing the joint deformation between the cutoff wall and the connecting plate.Compared with the traditional designs involving vertical joints and multiple connecting plates,the proposed comprehensive optimization schemes for the anti-seepage system in concrete-faced rockfill dams with thick overburden layers,which in-clude widening the top of the cutoff wall with connecting plates and inclined joints,and widening the top of the cutoff wall with inclined joints and a support wall beneath the toe slab,can reduce the settlement deforma-tion at the joint between the cutoff wall and the connecting plate by 41.5％and 53.8％,respectively.
deep overburden layerconcrete faced rockfill damjoint deformationoptimization design
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