干旱区生态环境知识资源中心(Arid): A two-dimensional experimental study of active progressive failure of deeply buried Qanat tunnels in sandy ground

Arid

DOI	10.1016/j.sandf.2023.101323
	A two-dimensional experimental study of active progressive failure of deeply buried Qanat tunnels in sandy ground
	Zhang, Yanfei; Liu, Xianfeng; Yuan, Shengyang; Chen, Weizhi; Dias, Daniel
通讯作者	Liu, XF
来源期刊	SOILS AND FOUNDATIONS
ISSN	0038-0806
EISSN	2524-1788
出版年	2023
卷号	63 期号:3
英文摘要	As an ancient underground hydraulic engineering facility, the Qanat system has been used to draw groundwater from arid regions. A qanat is a horizontal tunnel with a slight incline that draws groundwater from a higher location and delivers it to lower agricultural land. During long-term water delivery, the qanat tunnel has experienced different degrees of aging and collapse, which may result in the sig-nificant ground settlement and even disasters. This paper developed a two-dimensional laboratory system to investigate the influence of progressive failure on the stability of deeply buried qanat tunnels. The developed system is fully instrumented with a particle image velocimetry (PIV) system and earth pressure and displacement monitoring. A special cylindrical membrane tube is designed and con-nected to an advanced pressure-volume controller to simulate the step-wise failure process of the tunnel. Three model tests were con-ducted on a dry sand considering the buried qanat tunnels at three different depths. Experimental results clearly show the progressive evolution of soil arching effect in the dry sand associated with the progressive failure of the tunnels. The failure of the Qanat ground starts from the vault and develops upwards, which is closely related to the evolution of stress contour at three consecutive stages. Ground surface settlement and volume loss corresponding to three burial depths were compared. A deeply buried qanat tunnel has a small effect on surface settlement. Earth pressure evolution on the 2D plane shows the load redistribution when the qanat collapses. The maximum arch and the initial point of the limit state correspond to a volume loss of 12.5 % and 50 %, respectively. For the collapse of the deep buried qanat tunnel, ground earth pressure evolution can be divided into a stress-increasing region, stress-decreasing region, and no redistribution region. Furthermore, a multi trap-door model considering soil expansion is proposed to describe the progressive failure behavior and its effects.& COPY; 2023 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
英文关键词	Qanat tunnel Sand Failure effect Soil arching Model test
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001039052800001
WOS关键词	LOAD-TRANSFER MECHANISMS ; MODEL TEST ; EROSION
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
WOS研究方向	Engineering ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398681
推荐引用方式 GB/T 7714	Zhang, Yanfei,Liu, Xianfeng,Yuan, Shengyang,et al. A two-dimensional experimental study of active progressive failure of deeply buried Qanat tunnels in sandy ground[J],2023,63(3).
APA	Zhang, Yanfei,Liu, Xianfeng,Yuan, Shengyang,Chen, Weizhi,&Dias, Daniel.(2023).A two-dimensional experimental study of active progressive failure of deeply buried Qanat tunnels in sandy ground.SOILS AND FOUNDATIONS,63(3).
MLA	Zhang, Yanfei,et al."A two-dimensional experimental study of active progressive failure of deeply buried Qanat tunnels in sandy ground".SOILS AND FOUNDATIONS 63.3(2023).