Clogging of pervious concrete pile caused by soil piping: an approximate experimental study

Abstract

Due to their high permeability and high strength, pervious concrete piles (PCPs) can improve ground bearing capacity. However, clogging of pervious concrete in practice is a potential disadvantage. To investigate the clogging mechanism of PCPs due to sand piping, a series of laboratory simulation tests is conducted on a developed hydraulic conductivity test system. This testing demonstrates the effects of pervious concrete porosity, grading of fine movable particles, mix ratio of skeleton particles to movable particles, relative density of soil, and distance between PCPs on PCP clogging. The experimental test results show that the hydraulic conductivity of PCP decreases for approximately 70 min and then becomes relatively stable. In addition, it is observed that PCP clogging rarely occurs in cases of low pervious concrete porosity, small movable sand particle size, high sand relative density, and large pile distance. The results also show that measurement of electrical conductivity can be an alternative method of hydraulic conductivity measurement. Based on the test results, preliminary clogging models are proposed.

Study on the Process and Characteristics of Clogging for Ceramic Permeable Brick

“…erefore, particles smaller than 20 µm were hardly removed. e experimental results further proved that fine particles had a great influence on the clogging phenomenon [42]. Overall, the particles larger than 88 µm were almost removed completely, the particles within 20-88 µm were removed in variable amounts, and almost all the particles smaller than 20 µm passed through the brick during the clogging process.…”

“…At this time, particulates were easily congested or squeezed into this pore size range, which made it difficult to continue to move downwards under the action of (in spite of ) water and air flow. Furthermore, the particulates evolved into new skeletal particles, resulting in fewer pore channels and lower pore ratios [37], and interlocking of the pores with clogging particles [38]. Another reason why the large pores were easily blocked might be that the speed of rainwater passing through the large pores was slower [39].…”

Model tests on pervious concrete pile and impervious concrete pile composite foundation

“…Z. [3][4][5] and Mei G. X. [6] has studied the advantages of acceleration of excess pore water pressure dissipation and consolidation, but this method is still in this infancy, so further research is still needed.…”