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The article presents a discussion of the research paper "Influence of Particle-Size Distribution Homogeneity on Shearing of Soils Subjected to Internal Erosion" by S. Li, A. R. Russell and D. Muir Wood published in the "Canadian Geotechnical Journal" in 2020. The discussion provided a few observations about the test procedure and preparation of soil samples used to study the internal erosion process of granular soils. It also addressed the threshold value of fines.

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The authors discuss a report on vacuum preloading with booster pre-fabricated vertical drains to improve deep marine clay strata. Topics mentioned include selection of the method that can maintain the highest mobilized vacuum possible during the required preloading period at the site elevation, repeated reference to air pressure booster action in the report, and concepts for undrained shear strength of soft clays and silts based on fill loading.

The authors convey their response to a feedback about their report on vacuum preloading with booster pre-fabricated vertical drains (PVDs) to improve deep marine clay strata. Topics mentioned include the use of an airtight connector to connect the PVDs and horizontal airtight pipes directly, the use of a boosted PVD to replace the conventional booster tube, and the use of the booster PVD for drainage for the entire duration of the soil improvement process.

The author conveys his response to a commentary about a report that developed a series of stability charts that could be used for integrated deterministic and probabilistic analysis for soil slopes under pseudo-dynamic loading. Topics mentioned include the finite element modeling of the ground via Monte Carlo simulation, discrepancy between estimated failure probabilities, and the variance estimate used in first-order approximation.