Experimental Study of Static Disintegration on Unsaturated Soil

Abstract

In order to explore the disintegration characteristics of compacted loess, through the unsaturated soil disintegration instrument by independently developed,conduct the soaking disintegration experimental study on remolded soil unsaturated samples,obtained a series of experimental results:①The curves can be divided into the slow disintegration, rapid disintegration and stabilization of disintegration in three stages，the degree of compaction and water rate impact on rapidly disintegrating stage;②When the degree of compaction is certain,the disintegration rate decreased with the water contented increasing,the decreased amplitude is increasing with the moisture content increased to18%,the disintegration characteristics disappeared with the moisture content increased to 22%;③When the initial moisture content is certain, the disintegration rate decreased with the degree of compaction increasing, The time significantly prolonged when the disintegration completed. the decreased amplitude is increasing with the degree of compaction increased to 95%,the disintegration characteristics basically disappeared. Based on the relationship of degree of compaction and the moisture content to void ratio, the thesis establishes the model between the disintegration rate and the effective porosity ratio,the formula can be used to calculate the disintegration rate of compacted loess.The specific conclusions are:①When the critical moisture content increased to 22%,the disintegration characteristics disappeared;②When the critical degree of compaction increased to95%，the disintegration characteristics also disappeared.

Water‐induced disintegration behaviour of Malan loess

“…Poor permeability prolongs the duration of infiltration and saturation, leading to the slow disintegration of specimens. This finding is consistent with the results of previous investigations, that is the disintegration velocity of remoulded loess samples decreases with the increasing compaction degree (Li & Tian, 2005; Wang et al, 2014). The disintegration percentage of the specimens tends to increase with the increase of dry density.…”

“…The mass loss with time is recorded and used to interpret the characteristics of loess disintegration (Li et al, 2009). The external factors affecting the disintegration process of loess include water temperature, specimen size and shape and hanging mesh aperture (Wang et al, 2019); the internal factors include initial water content (Wang et al, 2019), compaction degree (Wang et al, 2014) and clay content (Yuan et al, 2017). The disintegration velocity increases with the water temperature.…”

Experimental study of loess disintegration characteristics

“…Test device The method to assess disintegration of soil is commonly used in indoor disintegration tests (Jiang et al, 1995;Li and Yan, 2011;Wang et al, 2014b). However, the device used has some drawbacks; it is difficult to correct the the reading of the buoyancy pontoon and it has low accuracy.…”

Relationship between Disintegration Characteristics and Intergranular Suction in Red Soil

“…In general, disintegration testing is performed using inundation techniques (shown in Figure 11); that is, the water's external inducement factor (which directly influences the pore air pressure, mineral composition and microstructures) is considered, although the temperature is also frequently mentioned. [34,35,42,73,96,101,102]; Scheme (b) [103]; Scheme (c) [77,82,104,105]; Scheme (d) [54,106]; Scheme (e) [107]; Scheme (f) [48]; Scheme (g) [38,101]; Scheme (h) [108]; Scheme (i) [109].…”

“…Figure 11. Disintegration testing instruments: Scheme (a)[34,35,42,73,96,101,102]; Scheme (b)[103]; Scheme (c)[77,82,104,105]; Scheme (d)[54,106]; Scheme (e)[107]; Scheme (f)[48]; Scheme (g)[38,101]; Scheme (h)[108]; Scheme (i)[109].…”