Efficiency of Geosynthetic Lateral Drainage in Northern Climates

1996 ◽  
Vol 1534 (1) ◽  
pp. 12-18
Author(s):  
Jean Lafleur ◽  
Y. Savard
Keyword(s):  
Glacial Till ◽  
In Situ Monitoring ◽  
Frost Heave ◽  
Full Scale Test ◽  
Severe Damage ◽  
Flow Rates ◽  
Scale Test ◽  
Frost Penetration ◽  
Lateral Drainage

During winter the formation of ice lenses causes frost heave within frost-susceptible materials. The uneven spatial distribution of heave due to heterogeneity results in severe damage to the pavement. Fissures are created, favoring excess infiltration, especially during subsequent springtime thaw. The installation of drainage can be beneficial in reducing the amount of water present in road foundations. Some uncertainty, however, exists about the sources of water feeding the lenses and, therefore, the optimal location of the systems. To assess the efficiencies of deep lateral drainage systems, a full-scale test has been undertaken along an existing road constructed on a glacial till subgrade. Three 150-m-long vertical geocomposite systems were installed at depths ranging between 2 and 3 m. In situ monitoring included piezometers and frost indicators and measurements of flow rates and pavement heave. To obtain a point of comparison, the measurements started 1 year before drain installation. For the period of observation the freezing indexes ranged between 1432°C-day and 1558°C-day, and the maximum frost penetration was 2.5 m. The flow rates varied considerably with the seasons, ranging between 1 ml/sec/linear meter during winter and 10 ml/sec/m during the April thaw. Before drainage the heave values ranged between 50 and 150 mm. After installation they were reduced by a factor ranging between 10 and 50 percent.

Mechanics of Buried Chilled Gas Pipelines

1996 ◽  
Author(s):  
A. P. S. Selvadurai ◽  
J. Hu
Keyword(s):  
Three Dimensional ◽  
Frozen Soil ◽  
Frost Heave ◽  
Elastic Behaviour ◽  
Full Scale Test ◽  
Flexural Behaviour ◽  
Moisture Migration ◽  
Factors Influencing ◽  
Scale Test ◽  
Interaction Test

This paper examines the factors influencing the modelling of soil-pipeline interaction for a pipeline which is used to transport chilled gas. The soil-pipeline interaction is induced by the generation of discontinuous frost heave at a boundary between soils with differing frost susceptibility. The three-dimensional modelling takes into consideration the time-dependent evolution of frost heave due to moisture migration, the creep and elastic behaviour of the frozen soil and flexural behaviour of the embedded pipeline. The results of the computational model are compared with experimental results obtained from the frost heave induced soil-pipeline interaction test performed at the full scale test facilities in Caen, France.

Using electrochemical coupling between parallel microbands for in situ monitoring of flow rates in microfluidic channels

2004 ◽  
Vol 573 (2) ◽  
pp. 333-343 ◽  
Author(s):  
Christian Amatore ◽  
Michele Belotti ◽  
Yong Chen ◽  
Emmanuel Roy ◽  
Catherine Sella ◽  
...  
Keyword(s):  
In Situ Monitoring ◽  
Microfluidic Channels ◽  
Flow Rates ◽  
Electrochemical Coupling

scholarly journals In situ monitoring of frost heave pressure during cross passage construction using ground-freezing method

2016 ◽  
Vol 53 (3) ◽  
pp. 530-539 ◽  
Author(s):  
Lei Han ◽  
Guan-lin Ye ◽  
Yuan-hai Li ◽  
Xiao-he Xia ◽  
Jian-hua Wang
Keyword(s):  
Pressure Gauge ◽  
Earth Pressure ◽  
In Situ Monitoring ◽  
Frost Heave ◽  
Freezing Process ◽  
Groundwater Levels ◽  
Freezing Method ◽  
Ground Freezing ◽  
Artificial Ground Freezing

The artificial ground-freezing method has the dual effect of ground reinforcement and waterproof sealing, and the frozen curtain can be designed flexibly. It is widely used in the construction of cross passages for shield tunnels in soft ground with high groundwater levels. However, due to the lack of in situ monitoring data, it remains difficult to determine the frost heave pressure acting upon a tunnel. In this study, based on the use of an anti-freezing pad-type earth pressure gauge, in situ monitoring was carried out to measure the frost heave pressure acting upon tunnel segments during the construction of cross passages for the Shanghai Yangtze River Tunnel. The monitoring results show that the earth pressure acting upon the tunnel could decrease dramatically during freezing, and this kind of decrease can take place suddenly and unpredictably, which can be illustrated using the finite element method. The maximum measured frost heave pressure during freezing and cross passage excavation was approximately 0.2 MPa, which was much smaller than the predicted value. Combining the distribution of temperature in the ground and construction countermeasures, the observed phenomena are mainly related to three factors: water migration during the freezing process, the tunnel–ground interaction, and the countermeasure of pressure release holes. The tunnel showed a horizontal extension–deformation, which was consistent with the releasing frost heave pressure acting upon it.

Frost penetration studies in glacial till on the James Bay hydroelectric complex

1978 ◽  
Vol 15 (4) ◽  
pp. 473-493 ◽  
Author(s):  
J. J. Paré ◽  
J. G. Lavallée ◽  
P. Rosenberg
Keyword(s):  
Thermal Conductivity ◽  
Geotechnical Properties ◽  
Glacial Till ◽  
Field Conditions ◽  
Frost Heave ◽  
James Bay ◽  
Freeze Thaw ◽  
Frost Penetration

This paper reports on observations of frost penetration into glacial till in a region of high freezing indices. The frost penetration measurements were carried out in borrow areas and in exposed dyke crests. The locations are far enough apart to be representative of regional frost penetrations. The frost susceptibility of the till is evaluated, and the effect of frost penetration on the design of freeboard and crest detail requirements for the dams and dykes is discussed. The geotechnical properties of the till are given along with the results of a series of surcharged cyclic freeze–thaw and thermal conductivity tests.The use of standard frost susceptibility criteria indicates that the till is classified as being highly frost susceptible; however, if surcharge pressure is considered and recognized as being a factor in reducing frost heave, then the till under field conditions may behave like a material of low frost susceptibility.

scholarly journals CHARACTERIZATION OF THE FROST HEAVE DEFORMATIONS IN HIGH LATITUDE AND DEEP SEASONALLY FROZEN SOIL OF INNER MONGOLIA WITH SENTINEL-1 INSAR OBSERVATIONS

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 887-891
Author(s):  
T. Qu ◽  
H. Zhang ◽  
F. Niu ◽  
X. Shi ◽  
Z. Li
Keyword(s):  
Time Series ◽  
High Latitude ◽  
Inner Mongolia ◽  
Hydrothermal Process ◽  
Frozen Soil ◽  
In Situ Monitoring ◽  
Frost Heave ◽  
Permafrost Degradation

Abstract. Global warming in recent years led to significant permafrost degradation worldwide. Accurate monitoring and comprehensive characterization of the deformation process in seasonally frozen soil is of great importance for constructions in cold regions in China. This work concentrates on the deformation laws and spatio-temporal characteristics of frost heave in high latitude and seasonally frozen soil of Inner Mongolia with time series InSAR observations. With 101 Sentinel-1 descending scenes that covered more than three freeze-thaw cycles for the study area along Shiwei-Labudalin Highway, this study realized the characterization of the frost heave deformations in seasonally frozen soil, and the analysis of the influencing factors of the hydrothermal process with the help of temperature and moisture data from in-situ monitoring. Time series InSAR observations show that most parts of the highway show obvious deformation with a displacement rate of around 30–60 mm/yr. Especially, the deformation evolution in this seasonally frozen soil region changes with seasons, demonstrating a notable annual cyclical characteristic and seasonal activity. Moreover, time series in-situ monitoring data in deep underground boreholes not only further explains the deformation kinematics from InSAR observations, but also provide a better supplement for a more comprehensive mechanism understanding of frost heave deformations.

Frost sensitivity of core materials: Case histories

1983 ◽  
Vol 20 (3) ◽  
pp. 373-384
Author(s):  
Z. V. Solymar ◽  
J. O. H. Nunn
Keyword(s):  
Laboratory Test ◽  
Frost Heave ◽  
Core Material ◽  
Dam Construction ◽  
Case Histories ◽  
North Shore ◽  
The North ◽  
Plastic Membrane ◽  
Frost Penetration

Waterloo Lake, White Lake, and Charlot River Power Projects are situated some 60 km west of Uranium City, Saskatchewan, on the north shore of Lake Athabasca.Waterloo Lake Dam is a simple zoned earth–rockfill structure with a wide central impervious core of silt. Since the first winter, frost penetration of the silt core has caused gradual deterioration of the dam. Pronounced longitudinal cracking and silt outflows have been evident along almost the entire length of the crest.Based on the experience gained from Waterloo Lake Dam and other northern projects the designs of the White Lake Dam and the Charlot River Dam incorporated safeguards against frost heave cracking of the core.This paper presents details of both in situ and laboratory test programs and the subsequent construction of the White Lake and Charlot River Dams. Keywords: bentonite, core material, frost, northern dam construction, plastic membrane.

Sign in / Sign up

Export Citation Format

Share Document