Influences of different modifiers on the disintegration of improved granite residual soil under wet and dry cycles  

作　　者：Yinlei Sun Qixin Liu Hansheng Xu Yuxi Wang Liansheng Tang 

机构地区：[1]School of Earth Science and Engineering,Sun Yat-Sen University,Zhuhai 519082,China [2]Guangdong Provincial Key Lab of Geodynamics and Geohazards,Zhuhai 519082,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China

出　　处：《International Journal of Mining Science and Technology》2022年第4期831-845,共15页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 41877228, 41877229 and 42102303);Guangdong Basic and Applied Basic Research Foundation (Nos. 2018B030311066 and 2019A1515010554);China Postdoctoral Science Foundation (No. 2019M663241);Science and Technology Program of Guangzhou, China (No. 201904010136)。

摘　　要：The disintegration of granite residual soil is especially affected by variations in physical and chemical properties. Serious geologic hazards or engineering problems are closely related to the disintegration of granite residual soil in certain areas. Research on the mechanical properties and controlling mechanisms of disintegration has become a hot issue in practical engineering. In this paper, the disintegration characteristics of improved granite residual soil are studied by using a wet and dry cycle disintegration instrument, and the improvement mechanism is analyzed. The results show that the disintegration amounts and disintegration ratios of soil samples treated with different curing agents are obviously different. The disintegration process of improved granite residual soil can be roughly divided into 5 stages:the forcible water intrusion stage, microcrack and fissure development stage, curing and strengthening stage, stable stage, and sudden disintegration stage. The disintegration of granite residual soil is caused by the weakening of the cementation between soil particles under the action of water. When the disintegration force is greater than the anti-disintegration force of soil, the soil will disintegrate. Cement and lime mainly rely on ion exchange agglomeration, the inclusion effect of curing agents on soil particles, the hard coagulation reaction and carbonation to strengthen granite residual soil. Kaolinite mainly depends on the reversibility of its own cementation to improve and strengthen granite residual soil. The reversibility of kaolinite cementation is verified by investigating pure kaolinite with a tensile, soaking, drying and tensile test cycle. Research on the disintegration characteristics and disintegration mechanism of improved granite residual soil is of certain reference value for soil modification.

关 键 词：Granite residual soil DISINTEGRATION Wet and dry cycle MECHANISM Improved soil 

分 类 号：P642.1[天文地球—工程地质学] TU43[天文地球—地质矿产勘探]