|Table of Contents|

Study on Pumping Test for Xi'an Metro Crossing Ground Fracture(PDF)

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

Issue:
2010年第04期
Page:
378-385
Research Field:
水资源与环境
Publishing date:

Info

Title:
Study on Pumping Test for Xi'an Metro Crossing Ground Fracture
Author(s):
LI Xin-sheng1; 2; 3;  WANG Peng-peng1;  LI Ya-sheng1;  LI Zhong-sheng1;  GAO Duo-wen1;  WAN Tong1;  GAO Hu-yan4
(1. School of Geological Engineering and Surveying, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Western Mineral Resources and Geology Engineering of Ministry of Education, Xi'an 710054,Shaanxi, China; 3. Open Research Laboratory of Geotechnical Engineering of Ministry of Land Resources,Xi'an 710054, Shaanxi, China; 4. Xi'an Metro Company Limited, Xi'an 710018, Shaanxi, China)
Keywords:
Xi'an Metro;  ground fracture;  pumping test;  permeability coefficient;  hydrological geology;  stationary flow
PACS:
P641.2
DOI:
-
Abstract:
Measuring hydrogeological condition of ground fissure could provide a basis for the design and construction of Xi'an Metro. Hydrogeological test around the ground fracture was done in Laodonglu primary school of Xi'an City, which located above the ground fracture, from July to September, 2008. It included water penetration, drilling hole injected with water and pumping tests, and the stationary flow pumping test in No.1 pumping well was taken as a special example. Effect of ground fracture on seepage action of ground water was studied. The three formulas(stationary flow dive fully penetrating well with one or two observation wells, water level reset rate fully penetrating well)were used to calculate the permeability coefficients of shallow soils, which were parallel or vertical to the ground fracture. The differences of permeability coefficients were discussed. Finally, effect of stress application of building on foundation soil was simulated by finite element software MADIS. The results showed that the permeability coefficients of soil body parallel to the ground fracture was a little bigger than that vertical to the ground fracture based on the above mentioned three formulas; the permeability coefficient calculated by the three formulas decreased in the order of water level reset rate fully penetrating well, stationary flow dive fully penetrating well with two observation wells and stationary flow dive fully penetrating well with one observation well under the same height of drop,and well loss caused the difference; the influence of building on soil body mainly focused on plain fill, loess and paleosol strata, gradually decreased under silty clay strata, and the influence depth was approximately 18 m; because of the load application of building to the upper side of ground fracture for a long time, effect of subsidiary stress caused foundation soil consolidation, and the permeability coefficients in the upper side of ground fracture was smaller than that in the lower side.

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Last Update: 2010-12-20