Numerical Analysis of Pumping-recovery Tests Performed on a Transverse Isotropic Circular Excavation

doi:10.16183/j.cnki.jsjtu.2013.06.001

Abstract

Abstract:

A consolidation model for saturated-unsaturated soil was formulated in axisymmetric cylindrical coordinates to simulate the hydraulic head changes and land deformations of circular excavations caused by well pumping. The transverse isotropic properties with respect to both hydraulic and mechanical properties were considered, so were the effects of underground structures. Based on this model, two groups of pumping-recovery tests performed on a circular excavation were simulated to study the effects of transverse isotropy related to Young's modulus and initial saturated hydraulic conductivity on hydraulic heads and soil displacements. The result shows that as Young's modulus increases, hydraulic head changes get easier and soil displacements get smaller. As initial saturated hydraulic conductivity increases, both hydraulic head changes and soil displacements get smaller.

Key words: circular excavation, transverse isotropy, pumping-recovery test

CLC Number:

TU473.3

HUANG Kai-yong, ZHOU Xiang-lian, WANG Jian-hua. Numerical Analysis of Pumping-recovery Tests Performed on a Transverse Isotropic Circular Excavation[J]. Journal of Shanghai Jiao Tong University, 2013, 47(06): 851-855.

Figures/Tables 7

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References 10

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参数名称	参数值
参数名称	砂土	黏土
n₀	0.44	0.66
K_satv0／（mm·s^-1）	0.906	2.29×10^-3
ν_hv	0.25	0.35
ν_h／ν_hv	0.2	0.2
E_v／kPa	8.33×10³	312
α_c	1.00	1.00
ρ_s／（kg·m^-3）	2.65×10³	2.80×10³
S_wr	1.52×10^-1	7.58×10^-5
α_v／m^-1	9.13	1.35
n_v	4.27	1.2