Consolidation, dilation and yield characteristics of unsaturated undisturbed loess in Qingyang
庆阳非饱和原状黄土固结, 剪胀与屈服特性的试验研究作者机构：Guangdong Sohui Technology Group Guangzhou 510000 China Beijing General Municipal Engineering Design and Research Institute Co. Ltd. Beijing 100082 China School of Civil and Transportation Engineering Guangdong University of Technology Guangzhou 510006 China
出 版 物：《Yantu Lixue/Rock and Soil Mechanics》 (Rock Soil Mech)
年 卷 期：2020年第41卷
页 面：219-228页
核心收录：
学科分类：0819[工学-矿业工程] 081401[工学-岩土工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0814[工学-土木工程]
主 题：Shrinkage
摘 要：The loess in Qingyang is characterized as silty loess based on particle size distribution. The confined compression tests and triaxial consolidation drainage shear tests with different combinations of confining pressure and matrix suction were carried out on undisturbed loess in Qingyang, and triaxial consolidation drainage shear tests on saturated remolded loess in Qingyang were also conducted. The results show that: (1) both the increase in net confining pressure and matrix suction cause the increase in the shear strength of undisturbed loess. However, the increase in the net confining pressure causes the development of shear shrinkage in undisturbed loess, while the increase in the matrix suction leads to the increase of undisturbed loess particle size and a much smaller shear shrinkage occurs. (2) Different volumetric deformation is induced by different stress paths such as triaxial consolidation and axial shearing under the same matrix suction force. (3) The Alonso model is applicable for unsaturated soils transformed from water loss after normal consolidation, but the prediction results show that the shear shrinkage in the undisturbed collapsible loess of Qingyang is relatively smaller than experimental value. Because the loess particles are fixed by the calcium cement before fully consolidated in place under their own weights, which results in more pores in the loess and this problem can be solved by adding state parameters in the shear dilatation equation. © 2020, Science Press. All right reserved.
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