|Table of Contents|

Simulated Study on High-pressure Penetration in Confined Aquifer of Xi'an(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2010年第04期
Page:
386-391
Research Field:
水资源与环境
Publishing date:

Info

Title:
Simulated Study on High-pressure Penetration in Confined Aquifer of Xi'an
Author(s):
SUN Gang-chen1; 2; 3;  PENG Jian-bing1; 4;  DAI Hai-tao5;  SUN Xiao-han1; 4;  HE Xiao-feng6;  LU Quan-zhong1; 4
(1. School of Geology Engineering and Surveying, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Guangxi Key Laboratory for Construction Engineering Testing and Experiment, Guilin University of Technology,Guilin 541004, Guangxi, China; 3. School of Civil Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China; 4. Key Laboratoryof Western Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi,China; 5. Engineering Company Limited of China Guangdong Nuclear Power Group, Shenzhen 518124, Guangdong,China; 6. Ningxia Institute of Land and Resources Investigation and Monitoring, Yinchuan 750004, Ningxia, China)
Keywords:
confined aquifer;  medium-fine sand;  groundwater head;  high-pressure penetration;  inelastic deformation;  particle composition
PACS:
P641
DOI:
-
Abstract:
In order to reveal the physical and mechanical properties of soil in confined aquifer of Xi'an when groundwater head changes, high-pressure infiltration and consolidation test system was designed to simulate the high-pressure penetration of medium-fine sand in confined aquifer of Xi'an. Relationships between strain and time, and strain and stress of sand column under different vertical pressure and pore water pressure were discussed; penetrability of sand sample was analyzed; and microstructures of sand samples before and after the test were compared. The results showed that sand column characterized compression deflection and piecewise linearity, when pore water pressure deceased or vertical pressure increased; deflection of sand column could not resile when pore water pressure increased in a certain limit of stress. According to the comparison of the test curves before and after the particle analysis, and the photographs of binocular microscope and electron scanning microscope before and after the tests, it was estimated that the sand sample characterized particle slides, position adjustment and particle crushed or fractured partly in the compression process. It caused particle composition changing and permeability coefficient sharply decreasing in the process of groundwater head change and the sand sample characterized imperfectly elastic, such as piecewise linearity, treacliness and partly irrecoverable.

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Last Update: 2010-12-20