AUTHOR=Zhenkun Hou , Zhanlin Li , Zejun Han , Mengxiong Tang , Yupeng Liu , Dingli Su , Lei Wang 

TITLE=Experimental research on the flow law of the grouting fluid in an annular gap between a non-soil-squeezing PHC pipe pile wall and a hole wall

JOURNAL=Frontiers in Ecology and Evolution

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2023.1133631

DOI=10.3389/fevo.2023.1133631

ISSN=2296-701X

ABSTRACT=Abstract: The bearing capacity of the drilling with pre-stressed concrete pile cased pile (hereafter referred to as DPC pile) is closely related to the grouting effect in the annular gap between the PHC pipe pile wall and hole wall (hereafter referred to as the annular pile-soil gap). A physical grouting model test system for the DPC pile has been independently developed based on a high-precision three-dimensional scanner and a multi-functional grouting box. In this way, the three-dimensional geometric size and spatial point information of the grouting stone have been quantitatively characterized. The influences of water-cement ratio, grouting pressure, collapsed holes, and falling sand have been studied. The following conclusions are obtained: (1) The quantitative characterization method of the three-dimensional geometric dimensions of the grouting stone based on a three-dimensional scan is accurate and reliable and can overcome the shortcomings of traditional manual measurement. (2) In the same horizontal plane, the thickness of the grouting body gradually decreases as the horizontal distance from the grouting outlet increases, and the higher the elevation, the greater the rate of decrease; conversely, the lower the elevation, the smaller the rate of decrease. When the horizontal distance from the pulp outlet is equal, the thickness of the slurry gradually decreases as the height increases. (3) For grouting liquid with a water-cement ratio of 0.5, the grouting pressure should not be lower than 0.6 MPa. (4) When the falling sand is not far above the grouting outlet, a grouting root system can be formed, whose grout veins, complexity, and grout coverage area can be optimally improved by changing the fluidity of the grout and the grouting pressure. When the falling sand is on the side of the grout outlet or above the grout outlet, but far away from the grout outlet, it is easy to be bypassed by the grout, which can greatly reduce the grouting effect.