Experimental study on time ⁃varying characteristics of saturated water content of granite residual soil in acid⁃etched environment

Authors

ZHANG Maolin, 1. China Communications Fourth Highway Engineering Bureau Co., Ltd., Beijing 100022, China;Follow
XIE Qingzhong, 1. China Communications Fourth Highway Engineering Bureau Co., Ltd., Beijing 100022, China;
FU Helin, 2. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;
ZHANG Meng, 1. China Communications Fourth Highway Engineering Bureau Co., Ltd., Beijing 100022, China;
LI Qinglong, 3. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, Hunan 411105, China
DONG Hui, 3. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, Hunan 411105, ChinaFollow

Abstract

In order to clarify the correlation between saturated water content variability and slope stability, characteristic tests on saturated water content of granite residual soil affected by acid were carried out. Direct shear tests were carried out to test the variation rule of saturated water content and its characteristic value under the influence of vertical loading and acidification time, and the internal causes of variation were deduced based on the structural characteristics obtained by microscope electron microscopy. The results show that: ① The vertical pressure σ = 300 kPa is the turning point of the linear and nonlinear relationship, and under the same vertical pressure, the acidification time is positively correlated with the saturated water content; ② The ion exchange efficiency between the surface ions of mineral particles and the acid solution is the highest when pH = 4 for 30 days of acidification, so pH = 4 is the characteristic value of acidity that affects the saturated water content. When the water chemical reaction of the saturated sample under pH > 4 is almost finished, there is a peak saturated water content. ③ The microstructure reflects that the change of saturated water content under acid etching is mainly related to the cementation type. The cementation type pattern under different acidity and acidification time is summarized.

Publication Date

7-14-2023

DOI

10.14048/j.issn.1671-2579.2023.03.037

First Page

237

Last Page

243

Submission Date

March 2025

Recommended Citation

Maolin, ZHANG; Qingzhong, XIE; Helin, FU; Meng, ZHANG; Qinglong, LI; and Hui, DONG (2023) "Experimental study on time ⁃varying characteristics of saturated water content of granite residual soil in acid⁃etched environment," Journal of China & Foreign Highway: Vol. 43: Iss. 3, Article 37.
DOI: 10.14048/j.issn.1671-2579.2023.03.037
Available at: https://zwgl1980.csust.edu.cn/journal/vol43/iss3/37

Reference

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