Research on the Consolidation Theory of Sand Drain Foundation Settlement

2011 ◽  
Vol 378-379 ◽  
pp. 282-287
Author(s):  
Wei Dong Pan ◽  
Xiao Long Sheng ◽  
Ren Guo Gu ◽  
Ke Zhu
Keyword(s):  
Water Level ◽  
Groundwater Level ◽  
Dissipation Rate ◽  
Field Measurements ◽  
Theoretical Research ◽  
Foundation Settlement ◽  
Soil Consolidation ◽  
Consolidation Process ◽  
Consolidation Theory ◽  
Groundwater Level Changes

In the consolidation theory of sand drain foundation settlement, the influence of groundwater level changes on the soil consolidation has been paid less attention. Therefore, discussing those changes' influence will help to deepen and perfect the sand drain consolidation theory. Through theoretical research and field measurements, the concrete influences of water level weight, dissipation rate and other factors on the consolidation process are obtained. This helps to improve the consolidation theory and efficiency.

A Probabilistic Model of Aquifer Susceptibility to Earthquake-Induced Groundwater-Level Changes

2020 ◽  
Vol 110 (3) ◽  
pp. 1046-1063 ◽  
Author(s):  
Konrad C. Weaver ◽  
R. Arnold ◽  
C. Holden ◽  
J. Townend ◽  
S. C. Cox
Keyword(s):  
New Zealand ◽  
Water Level ◽  
Random Effects ◽  
Groundwater Level ◽  
Probabilistic Model ◽  
Modeling Framework ◽  
Monitoring Wells ◽  
Monitoring Well ◽  
Water Level Changes ◽  
Groundwater Level Changes

ABSTRACT A probabilistic model for earthquake-induced persistent groundwater-level response as a function of peak ground velocity (PGV) has been constructed using a catalog of monitoring well observations spanning multiple earthquakes. The regional-scale, multi-site, multi-earthquake investigation addresses the occurrence and absence of hydraulic responses to large earthquakes spanning almost a decade of seismic shaking. Persistent groundwater-level changes, or absences of change, have been quantified in 495 monitoring wells in response to one or more of 11 recent New Zealand earthquakes larger than Mw 5.4 that occurred between 2008 and 2017. A binary logistic regression model with random effects has been applied to the dataset using three predictors: earthquake shaking (PGV), degree of hydrogeological confinement (monitoring well depth), and rock strength (site-average shear-wave velocity). Random effects were included as a partial proxy for variations in monitoring wells’ susceptibilities to earthquake-induced persistent water-level changes. Marginal probabilities have been calculated as a function of PGV and related to modified Mercalli intensity (MMI) levels using a New Zealand-specific MMI–PGV relationship that enables the likelihood of persistent water-level changes to be expressed for MMIs of II–VIII. This study capitalizes on one of the largest catalogs of earthquake hydrological observations compiled worldwide and is the first attempt at incorporating seismic and hydrogeological factors in a common probabilistic description of earthquake-induced groundwater-level changes. This modeling framework provides a more generalizable approach to quantifying responses than alternative metrics based on epicentral distance, magnitude, and seismic energy density. It has potential to enable better comparison of international studies and to inform practitioners making engineering or investment decisions to mitigate risk and increase the resilience of water-supply infrastructure.

scholarly journals Seismological and Hydrogeological Controls on New Zealand-Wide Groundwater Level Changes Induced by the 2016 Mw 7.8 Kaikōura Earthquake

2021 ◽  
Author(s):  
KC Weaver ◽  
SC Cox ◽  
John Townend ◽  
H Rutter ◽  
IJ Hamling ◽  
...  
Keyword(s):  
New Zealand ◽  
Water Level ◽  
Groundwater Level ◽  
Ground Acceleration ◽  
Permeability Enhancement ◽  
Water Level Changes ◽  
Stress Changes ◽  
Kaikoura Earthquake ◽  
Directivity Effects ◽  
Groundwater Level Changes

© 2019 K. C. Weaver et al. The 2016 Mw 7.8 Kaikōura earthquake induced groundwater level changes throughout New Zealand. Water level changes were recorded at 433 sites in compositionally diverse, young, shallow aquifers, at distances of between 4 and 850 km from the earthquake epicentre. Water level changes are inconsistent with static stress changes but do correlate with peak ground acceleration (PGA). At PGAs exceeding 2 m/s2, water level changes were predominantly persistent increases. At lower PGAs, there were approximately equal numbers of persistent water level increases and decreases. Shear-induced consolidation is interpreted to be the predominant mechanism causing groundwater changes at accelerations exceeding 2 m/s2, whereas permeability enhancement is interpreted to predominate at lower levels of ground acceleration. Water level changes occur more frequently north of the epicentre, as a result of the fault's northward rupture and resulting directivity effects. Local hydrogeological conditions also contributed to the observed responses, with larger water level changes occurring in deeper wells and in well-consolidated rocks at equivalent PGA levels.

scholarly journals Seismological and Hydrogeological Controls on New Zealand-Wide Groundwater Level Changes Induced by the 2016 Mw7.8 Kaikōura Earthquake

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
K. C. Weaver ◽  
S. C. Cox ◽  
J. Townend ◽  
H. Rutter ◽  
I. J. Hamling ◽  
...  
Keyword(s):  
New Zealand ◽  
Water Level ◽  
Groundwater Level ◽  
Ground Acceleration ◽  
Permeability Enhancement ◽  
Water Level Changes ◽  
Stress Changes ◽  
Kaikoura Earthquake ◽  
Directivity Effects ◽  
Groundwater Level Changes

The 2016 Mw7.8 Kaikōura earthquake induced groundwater level changes throughout New Zealand. Water level changes were recorded at 433 sites in compositionally diverse, young, shallow aquifers, at distances of between 4 and 850 km from the earthquake epicentre. Water level changes are inconsistent with static stress changes but do correlate with peak ground acceleration (PGA). At PGAs exceeding ~2 m/s2, water level changes were predominantly persistent increases. At lower PGAs, there were approximately equal numbers of persistent water level increases and decreases. Shear-induced consolidation is interpreted to be the predominant mechanism causing groundwater changes at accelerations exceeding ~2 m/s2, whereas permeability enhancement is interpreted to predominate at lower levels of ground acceleration. Water level changes occur more frequently north of the epicentre, as a result of the fault’s northward rupture and resulting directivity effects. Local hydrogeological conditions also contributed to the observed responses, with larger water level changes occurring in deeper wells and in well-consolidated rocks at equivalent PGA levels.

scholarly journals Seismological and Hydrogeological Controls on New Zealand-Wide Groundwater Level Changes Induced by the 2016 Mw 7.8 Kaikōura Earthquake

2021 ◽  
Author(s):  
KC Weaver ◽  
SC Cox ◽  
John Townend ◽  
H Rutter ◽  
IJ Hamling ◽  
...  
Keyword(s):  
New Zealand ◽  
Water Level ◽  
Groundwater Level ◽  
Ground Acceleration ◽  
Permeability Enhancement ◽  
Water Level Changes ◽  
Stress Changes ◽  
Kaikoura Earthquake ◽  
Directivity Effects ◽  
Groundwater Level Changes

© 2019 K. C. Weaver et al. The 2016 Mw 7.8 Kaikōura earthquake induced groundwater level changes throughout New Zealand. Water level changes were recorded at 433 sites in compositionally diverse, young, shallow aquifers, at distances of between 4 and 850 km from the earthquake epicentre. Water level changes are inconsistent with static stress changes but do correlate with peak ground acceleration (PGA). At PGAs exceeding 2 m/s2, water level changes were predominantly persistent increases. At lower PGAs, there were approximately equal numbers of persistent water level increases and decreases. Shear-induced consolidation is interpreted to be the predominant mechanism causing groundwater changes at accelerations exceeding 2 m/s2, whereas permeability enhancement is interpreted to predominate at lower levels of ground acceleration. Water level changes occur more frequently north of the epicentre, as a result of the fault's northward rupture and resulting directivity effects. Local hydrogeological conditions also contributed to the observed responses, with larger water level changes occurring in deeper wells and in well-consolidated rocks at equivalent PGA levels.

scholarly journals Groundwater-level changes in response to bursts of seismic activity off the Izu Peninsula, Japan

1999 ◽  
Vol 26 (16) ◽  
pp. 2501-2504 ◽  
Author(s):  
Masao Ohno ◽  
Tsutomu Sato ◽  
Kenji Notsu ◽  
Hiroshi Wakita ◽  
Kunio Ozawa
Keyword(s):  
Groundwater Level ◽  
Seismic Activity ◽  
Izu Peninsula ◽  
Groundwater Level Changes
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