US 11,987,941 B2
Pier scour protection method by combinating a downward bivariate normal distribution surface and granular mixture
Zhilin Sun, Hangzhou (CN); Yizhi Sun, Hangzhou (CN); and Haiyang Dong, Hangzhou (CN)
Assigned to ZHEJIANG UNIVERSITY, Hangzhou (CN)
Filed by ZHEJIANG UNIVERSITY, Zhejiang (CN)
Filed on Apr. 19, 2022, as Appl. No. 17/723,461.
Application 17/723,461 is a continuation of application No. PCT/CN2021/072817, filed on Jan. 20, 2021.
Claims priority of application No. 202110035631.7 (CN), filed on Jan. 12, 2021.
Prior Publication US 2022/0235524 A1, Jul. 28, 2022
Int. Cl. E01D 19/02 (2006.01); E02B 3/02 (2006.01); E02B 17/00 (2006.01)
CPC E01D 19/02 (2013.01) [E02B 3/02 (2013.01); E02B 17/0017 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A pier scour protection method by combinating a downward bivariate normal distribution surface and granular mixture, wherein the method is used for protecting a pier foundation of a sea-crossing or river-crossing bridge from scouring, laying a protection structure in a shape of a downward bivariate normal distribution surface when a depth of a local scour hole around a pile or a bridge pier reaches a given depth, and paving a bottom of a rotationally symmetric surface with the granular mixture with a specific thickness, wherein the bottom of the rotationally symmetric surface is located at mhb below a bed surface, where hb is a maximum depth of the scour hole, and m=0.7-0.9.