气候变化领域集成服务门户(CCPortal): Effect of freeze-thaw cycles on soil engineering properties of reservoir bank slopes at the northern foot of Tianshan Mountain

CCPortal

DOI	10.1007/s11629-020-6215-z
	Effect of freeze-thaw cycles on soil engineering properties of reservoir bank slopes at the northern foot of Tianshan Mountain
	Qin Zi-peng; Lai Yuan-ming; Tian Yan; Zhang Ming-yi
发表日期	2021
ISSN	1672-6316
EISSN	1993-0321
起始页码	541
结束页码	557
卷号	18 期号:2
英文摘要	The instability of soil bank slopes induced by freeze-thaw cycles at the northern foot of Tianshan Mountain is very common. The failure not only caused a large amount of soil erosion, but also led to serious reservoir sedimentation and water quality degradation, which exerted a lot of adverse effects on agricultural production in the local irrigation areas. Based on field investigations on dozens of irrigation reservoirs there, laboratory tests were carried out to quantitatively analyze the freeze-thaw effect on the soil engineering characteristics to reveal the facilitation on the bank slope instability. The results show that the softening characteristics of the stressstrain curves gradually weaken, the effective cohesions decline exponentially, the seepage coefficients enlarge, and the thermal conductivities decrease after 7 freeze-thaw cycles. The freeze-thaw effect on the specimens with low confining pressures, low dry densities and high water contents is more significant. The water migration and the phase transition between water and ice result in the variations of the soil internal microstructures, which is the main factor affecting the soil engineering characteristics. Sufficient water supply and the alternation of positive and negative temperatures at the reservoir bank slopes in cold regions make the water migration and phase transition in the soil very intensely. It is easy to form a large number of pores and micro cracks in the soil freezing and thawing areas. The volume changes of the soil and the water migration are difficult to reach a dynamic balance in the open system. Long-term freeze-thaw cycles will bring out the fragmentation of the soil particles, resulting in that the micro cracks on the soil surfaces are developing continuously. The soil of the bank slopes will fall or collapse when these cracks penetrate, which often happens in winter there.
英文关键词	Mechanical properties; Seepage coefficient; Thermal conductivity; Micro structure; Freeze-thaw cycles; Reservoir bank slope
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS关键词	SHEAR-STRENGTH ; MECHANICAL-PROPERTIES ; THERMAL-CONDUCTIVITY ; SILTY CLAY ; HYDRAULIC CONDUCTIVITY ; DAMAGE MECHANISM ; REGION
WOS记录号	WOS:000606417600001
来源期刊	JOURNAL OF MOUNTAIN SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/240153
作者单位	[Qin Zi-peng; Lai Yuan-ming; Zhang Ming-yi] Chinese Acad, State Key Lab Frozen Soil Engn, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Qin Zi-peng; Lai Yuan-ming; Zhang Ming-yi] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Tian Yan] Lanzhou Univ, Coll Civil Engn & Mech, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Qin Zi-peng,Lai Yuan-ming,Tian Yan,et al. Effect of freeze-thaw cycles on soil engineering properties of reservoir bank slopes at the northern foot of Tianshan Mountain[J]. 中国科学院西北生态环境资源研究院,2021,18(2).
APA	Qin Zi-peng,Lai Yuan-ming,Tian Yan,&Zhang Ming-yi.(2021).Effect of freeze-thaw cycles on soil engineering properties of reservoir bank slopes at the northern foot of Tianshan Mountain.JOURNAL OF MOUNTAIN SCIENCE,18(2).
MLA	Qin Zi-peng,et al."Effect of freeze-thaw cycles on soil engineering properties of reservoir bank slopes at the northern foot of Tianshan Mountain".JOURNAL OF MOUNTAIN SCIENCE 18.2(2021).