Experimental study on laws of frost heave and thawing settlement of the artificially frozen soil

2004 ◽  
pp. 493-496
Author(s):  
Wenshun Wang ◽  
Jianping Wang ◽  
Huiguang Yin
Keyword(s):  
Experimental Study ◽  
Frozen Soil ◽  
Frost Heave

Experimental study on settlement of model piles in frozen soil under dynamic loading

1999 ◽  
Vol 42 (S1) ◽  
pp. 30-37 ◽  
Author(s):  
Jianming Zhang ◽  
Yuanlin Zhu ◽  
Jiayi Zhang
Keyword(s):  
Experimental Study ◽  
Dynamic Loading ◽  
Frozen Soil

Stress Analysis of Pipeline Subjected to Differential Frost Heave

2013 ◽  
Author(s):  
Yan Di ◽  
Jian Shuai ◽  
Lingzhen Kong ◽  
Xiayi Zhou
Keyword(s):  
Strain Analysis ◽  
Element Model ◽  
Frozen Soil ◽  
Computational Method ◽  
Frost Heave ◽  
Safe Operation ◽  
Stress Strain ◽  
Segregation Potential ◽  
Differential Frost Heave ◽  
Design Construction

Frost heave must be considered in cases where pipelines are laid in permafrost in order to protect the pipelines from overstress and to maintain the safe operation. In this paper, a finite element model for stress/strain analysis in a pipeline subjected to differential frost heave was presented, in which the amount of frost heave is calculated using a segregation potential model and considering creep effects of the frozen soil. In addition, a computational method for the temperature field around a pipeline was proposed so that the frozen depth and temperature variation gradient could be obtained. Using the procedure proposed in this paper, stress/strain can be calculated according to the temperature on the surface of soil and in a pipeline. The result shows the characteristics of deformation and loading of a pipeline subjected to differential frost heave. In general, the methods and results in this paper can provide a reference for the design, construction and operation of pipelines in permafrost areas.

Microstructure-Based Random Finite Element Method Simulation of Frost Heave: Theory and Implementation

2018 ◽  
Vol 2672 (52) ◽  
pp. 347-357 ◽  
Author(s):  
Shaoyang Dong ◽  
Xiong (Bill) Yu
Keyword(s):  
Finite Element ◽  
Ground Surface ◽  
Finite Element Method Simulation ◽  
Element Model ◽  
Frozen Soil ◽  
Traffic Load ◽  
Frost Heave ◽  
Holistic Model ◽  
Water Pipes ◽  
Random Finite Element

Frost heave can cause serious damage to civil infrastructure. For example, interactions of soil and water pipes under frozen conditions have been found to significantly accelerate pipe fracture. Frost heave may cause the retaining walls along highways to crack and even fail in cold climates. This paper describes a holistic model to simulate the temperature, stress, and deformation in frozen soil and implement a model to simulate frost heave and stress on water pipelines. The frozen soil behaviors are based on a microstructure-based random finite element model, which holistically describes the mechanical behaviors of soils subjected to freezing conditions. The new model is able to simulate bulk behaviors by considering the microstructure of soils. The soil is phase coded and therefore the simulation model only needs the corresponding parameters of individual phases. This significantly simplifies obtaining the necessary parameters for the model. The capability of the model in simulating the temperature distribution and volume change are first validated with laboratory scale experiments. Coupled thermal-mechanical processes are introduced to describe the soil responses subjected to sub-zero temperature on the ground surface. This subsequently changes the interaction modes between ground and water pipes and leads to increase of stresses on the water pipes. The effects of cracks along a water pipe further cause stress concentration, which jeopardizes the pipe’s performance and leads to failure. The combined effects of freezing ground and traffic load are further evaluated with the model.

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.

A review of the mechanisms of cambering and valley bulging

1991 ◽  
Vol 7 (1) ◽  
pp. 373-380 ◽  
Author(s):  
C. D. Parks
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Cold Period ◽  
Frost Heave ◽  
Primary Mechanism ◽  
Field Evidence ◽  
Cap Rock ◽  
Rock Load

AbstractA study has been undertaken to investigate the mechanism of cambering and valley bulging. Previously proposed primary mechanisms are critically reviewed and discussed. The primary mechanism proposed here is that of frost heave and creep of valley slopes, enhanced by slope erosion and cap rock load during a period of periglaciation, partly at the onset of the cold period but predominantly whilst the ground was in frozen and thawing states. The mechanism is supported by experimental study, a mathematical model and field evidence.

Ice lens formation at a silt–sand interface

1995 ◽  
Vol 32 (3) ◽  
pp. 488-495 ◽  
Author(s):  
Sharon L. Smith ◽  
Peter J. Williams
Keyword(s):  
Soil Structure ◽  
Frozen Soil ◽  
Frost Heave ◽  
Controlled Environment ◽  
Freezing And Thawing ◽  
Ground Freezing ◽  
Residual Deformations ◽  
Cumulative Residual ◽  
Lens Formation ◽  
Soil Interface

A major experiment simulating ground freezing around a buried chilled pipeline in a controlled-environment facility provided an opportunity to examine the form and orientation of ice lenses associated with a vertical interface between silt and sand. The heave of the silt decreased towards the interface and ice lenses in the silt were found to dip at an increasing angle in the same direction. Consideration of the thermal regime suggests that the direction of heat flow influences the orientation of the lenses. The interface was irregular and ice lenses at the lower part of the interface were closely aligned to it, indicating that changes in soil texture also influence ice lens orientation. Deformation of ice lenses appears to have occurred in the silt near to the interface. The arrangement of the lenses can be explained by the different thermal properties and thermodynamic behaviour of the two materials and by the mechanical "anchorage" of the sand in which there is no ice lens formation. Cycles of freezing and thawing modify soil structure and produce cumulative residual deformations which are modified by a soil interface. Key words : frost heave, ice lenses, frozen soil, vertical silt–sand interface, chilled pipeline, differential heave.

Study on the Frost Heave Characteristics of Artificial Frozen Soil Under Different Freezing Mode

2012 ◽  
Vol 204-208 ◽  
pp. 599-603
Author(s):  
Jun Hao Chen
Keyword(s):  
Structural Design ◽  
Computer Control ◽  
Frozen Soil ◽  
The Self ◽  
Frost Heave ◽  
Test Machine ◽  
Freezing Method ◽  
Artificial Freezing ◽  
Similarities And Differences ◽  
Artificial Freezing Method

At the self-developed DZL-001 computer control of frozen soil frozen-heave test machine, use artificial freezing method carry out vertical and lateral freezing two modes frost heave test of remoulded clay, each mode test includes under no replenishment and replenishment conditions. Monitor the temperature, moisture and frost heave of frozen soil at different location. Compare the similarities and differences of frost heave characteristics of two modes, master the frost heave characteristics of artificial frozen soil. The results provide a certain guidance and reference meaning to layer sidewall structural design.

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