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Computation Analysis of Hydrogeological Parameters of Phreatic Aquifer Based on Pumping Test

Author: MaChenGuang
Tutor: HanXiaoLei
School: Xi'an University of Architecture and Technology
Course: Geotechnical Engineering
Keywords: phreatic aquifer interferentical well pumping test permeability coefficient radius of dewatering influence
CLC: P641.2
Type: Master's thesis
Year: 2011
Downloads: 481
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Abstract


The permeability coefficient and radius of dewatering influence of phreatic aquifer, the degree of accuracy of which have a direct impact on reliability of excavation dewatering design, are two important hydrogeological parameters in excavation dewatering design. The determination method of permeability coefficient and radius of dewatering influence is field pumping test. At present, steady flow pumping test is often used to test the permeability coefficient and radius of dewatering influence of phreatic aquifer in practice. But the test method needs much exploration and test wrok, which is often diffcult to realize.With the development and application of unsteady theory of the motion of ground water, more and more unsteady flow formula is used to find the solution of phreatic aquifer parameters. In the two cases of pumping in interferentical single well of phreatic without and with observation holes, the paper study the solution method of permeability coefficient and radius of dewatering influence according to the theory of stable and unstable flow, pointing out the shortcomings of common methods and giving methods how to solve parameters. At last , the aforementioned methods are verified by filed pumping test data in Xi’an north station, and compared to the result of steady flow pumping test formula of two observation wells, proofing the rationality and practicability of methods of this paper.Through study of the paper, some conclusions can be made as follows: 1. In the case of pumping in interferentical single well of phreatic without observation holes:①Using conventional method(iterative method of Dupuit, J. -J. formula and emprical formula ) to solve permeability coefficient and radius of dewatering influence is short of the theory evidence;②When having more drawdown of pumping well(0.1H<s_w <0.3H,H-thickness of phreatic aquifer, s_w -drawdown of pumping well ), it well have some ww amount of deviation compared with the actual situation using speeddown method to solve permeability coefficient;③Using recovery theory of pumping well to solve permeability coefficient and radius of dewatering influence is concordant with the actual situation, which is premise with drawdown of pumping well of belowing 0.3H. 2. In the case of pumping in interferentical single well of phreatic with one observation hole:①Using steady flow formula to solve permeability coefficient and radius of dewatering influence is concordant with the actual situation, however, which needs calculating well loss, so at least carrying out three times steady draw-off with much work;②Using straight line slope method of observation hole to solve permeability coefficient has some amount of deviation compared with the actual situation;③Combining with recovery theory formula of observation hole and equivalence of big well formula to solve permeability coefficient and radius of dewatering influence is concordant with the actual situation, without calculating well loss. Thus, for permeability coefficient and radius of dewatering influence of phreatic aquifer, in the two cases of pumping in interferentical single well of phreatic without and with observation holes, the former suggests adopting recovery theory to solve, the latter suggests adopting the method of combining with recovery theory formula of observation hole and equivalence of big well formula to solve.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Hydrogeology (groundwater hydrology ) > Groundwater Dynamics
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