Model Discussion of Pressure Fluctuations Propagation within Lining Slab Joints in Stilling Basins

Pressure fluctuations propagation within lining slab joints is one of the main causes of linings damage in stilling basins downstream of large dams. Based on three hydraulic models for pressure fluctuations propagation within lining slab joints proposed in the last 30 years, this paper uses both theoretical analysis and numerical simulation to study the mechanism of pressure propagation within joints. The result shows that these models have the inherent relationship but are adoptable to flows at different stages. The model of vibrating flow may simulate the flows within joints of lining slabs which vibrate randomly within their matrix. When lining slabs do not vibrate in their matrix, the model of transient flow can explain reasonably the mechanism of pressure fluctuations propagation within lining slab joints and the cause of fluctuating uplift generation. The model of seepage is only accepted when the joints of lining slabs are blocked completely.

[1]  Alberto Bellin,et al.  Direct Dynamic Force Measurement on Slabs in Spillway Stilling Basins , 1995 .

[2]  Anton Schleiss,et al.  Discussion of ''Simulation of Scour Process in Plunging Pool of Loose Bed- , 2002 .

[3]  A. Rinaldo,et al.  Turbulent pressure fluctuations under hydraulic jumps , 1992 .

[4]  Liu Shanjun,et al.  Experimental Investigation on Influence of Aeration on Plane Jet Scour , 2004 .

[6]  Erik Bollaert,et al.  Scour of rock due to the impact of plunging high velocity jets Part II: Experimental results of dynamic pressures at pool bottoms and in one- and two-dimensional closed end rock joints , 2003 .

[7]  Peiqing Liu,et al.  Experimental investigation of fluctuation uplift on rock blocks at the bottom of the scour pool downstream of Three-Gorges spillway , 1998 .

[8]  Pierre Y. Julien,et al.  Mechanics of jet scour downstream of a headcut , 1993 .

[9]  G. Rehbinder.  A theory about cutting rock with a water jet , 1980 .

[10]  G. Rehbinder.  Slot cutting in rock with a high speed water jet , 1977 .

[11]  J. F. Melo,et al.  Forces on Plunge Pool Slabs: Influence of Joints Location and Width , 2006 .

[12]  V. Fiorotto,et al.  Design of anchored slabs in spillway stilling basins , 2000 .

[13]  Qing Wang.  STUDY ON FULL-BRIDGE ZERO-VOLTAGE-SWITCH INVERTER RESISTANCE WELDING MACHINE , 2002 .

[14]  Willi H. Hager,et al.  Effect of Jet Air Content on Plunge Pool Scour , 2003 .

[15]  Joel W. Toso,et al.  Karnafuli Project, Model Studies of Spillway Damage , 1988 .

[16]  A. Rinaldo,et al.  Fluctuating Uplift and Lining Design in Spillway Stilling Basins , 1992 .

[17]  Yafei Jia,et al.  Simulation of Scour Process in Plunging Pool of Loose Bed-Material , 2001 .

[18]  E. Bollaert,et al.  Physically Based Model for Evaluation of Rock Scour due to High-Velocity Jet Impact , 2005 .

[19]  Joel W. Toso,et al.  Extreme Pressures in Hydraulic‐Jump Stilling Basins , 1988 .