Experimental Study of the Anisotropic Frost Heave Characteristics of Rock Surrounding Tunnels in Cold Regions

2021 ◽  
Vol 35 (4) ◽  
pp. 04021014
Author(s):  
Qiang Feng ◽  
Zedong Yang ◽  
Weiwei Liu ◽  
Weisheng Zhao
Keyword(s):  
Experimental Study ◽  
Frost Heave ◽  
Cold Regions

scholarly journals Experimental Study on Nano-SiO2 Improving Concrete Durability of Bridge Deck Pavement in Cold Regions

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Youkun Cheng ◽  
Zhenwu Shi
Keyword(s):  
Experimental Study ◽  
Abrasion Resistance ◽  
Calcium Silicate Hydrate ◽  
Bridge Deck ◽  
Hardened Cement ◽  
Concrete Durability ◽  
Ion Permeability ◽  
Cold Regions ◽  
Bridge Deck Pavement ◽  
Early Damage

In order to reduce early damage of bridge deck pavement concrete in cold regions, a certain content of nano-SiO2 is added into the concrete to enhance its durability. Through tests on four durability indexes, strength, frost resistance, resistance to Cl− ion permeability, and abrasion resistance of concrete with 1% nano-SiO2 content and concrete without nano-SiO2, the ability of nano-SiO2 to improve the concrete durability of bridge deck pavement is evaluated. The results of tests and analysis show that the incorporation of nano-SiO2 greatly improves the four durability indexes. Nano-SiO2 effectively absorbs the calcium hydroxide released early by the hydration of cement, increases the calcium silicate hydrate content, and elevates the interface between the paste and aggregate of the hardened cement, which improves the durability of the concrete.

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.

Experimental study on heat transfer of upright pipes in cold regions

2017 ◽  
Vol 117 ◽  
pp. 17-23 ◽  
Author(s):  
Fenglei Han ◽  
Lin Chen ◽  
Wenbing Yu ◽  
Weibo Liu ◽  
Xin Yi
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Cold Regions

Effect of fines content on frost heave

1996 ◽  
Vol 33 (4) ◽  
pp. 678-680 ◽  
Author(s):  
Robert E Tester ◽  
Paul N Gaskin
Keyword(s):  
Key Words ◽  
Frost Heave ◽  
Cold Regions ◽  
Fines Content ◽  
Frost Action ◽  
Road Base ◽  
Pavement Structures ◽  
Freezing Test ◽  
Crushed Limestone ◽  
The U.S

In regions of seasonal frost the integrity of pavement structures is dependent on the resistance of base and subbase soils to frost action. This note describes the results of performing the U.S. Army Cold Regions Research and Engineering Laboratory CRREL II laboratory freezing test on a crushed limestone with a varying fines content. Frost heave increased linearly as fines content increased. Under the CRREL frost susceptibility criterion, the crushed gravel was satisfactory with up to 8% fines. A greater fines content resulted in an unsatisfactory classification. Key words: frost susceptibility, fines content, road base.

Design of an Intelligent De-Icing System for Offshore Structures

2013 ◽  
Vol 321-324 ◽  
pp. 1602-1608 ◽  
Author(s):  
Kamran Zaman ◽  
Umair Najeeb Mughal ◽  
Muhammad Shakeel Virk
Keyword(s):  
Experimental Study ◽  
Surface Temperature ◽  
Control Method ◽  
Sea Water ◽  
Control Unit ◽  
Offshore Structures ◽  
Preliminary Design ◽  
Operational Environment ◽  
Cold Regions ◽  
Cold Room

The offshore activities in cold waters have moved from shallow to deep sea waters, which require different operations as compared to activities in hot sea water. Such offshore operations in cold regions like arctic may be effected by the ice accretion on deck and other areas of structure. Ice mainly accretes from both sea spray and atmospheric icing, which can create problems for operational environment and safety of people working on offshore structures in cold regions. In this research a lab based experimental study has been carried out to preliminary design and test an intelligent thermal anti/de-icing system. The experimental study was carried out in cold room chamber of Narvik University College, where temperature can be well controlled between +10 to-30 °C. The proposed intelligent thermal based deicing system can be used to control the communication between icing sensors, weather station, heating devices and central control unit. In this preliminary design phase, a simple surface temperature control method has been developed and tested that can further provides an efficient thermal deicing method and will also be capable to control the surface temperature of objects of interest in cold regions

scholarly journals Analysis of main points of channel freezing-thawing disease in cold region and influence of channel base soil on the disease

2021 ◽  
Vol 329 ◽  
pp. 01090
Author(s):  
Liqing Liang
Keyword(s):  
North China ◽  
Hydraulic Structure ◽  
Research Direction ◽  
Frozen Soil ◽  
Frost Heave ◽  
Cold Region ◽  
Freezing And Thawing ◽  
Cold Regions ◽  
Seasonal Frozen Soil ◽  
Base Soil

The frozen soil area in China is more than two thirds of the total territory, so the problem of frost heave is obvious. Especially in northeast, northwest, north China and other cold regions, the problem of frost heave of hydraulic structures is very common. Canal is a common hydraulic structure in agricultural water, which is affected by seasonal frozen soil and may cause problems such as lining damage, seepage and irrigation efficiency. Therefore, this paper mainly summarizes the necessity of research on channel freezingthawing damage, the research direction of channel freezing-thawing damage, and expounds the influence of seasonal frozen soil on freezing and thawing diseases in cold regions by taking the particle size of saturated soil based on channel as an example.

Sign in / Sign up

Export Citation Format

Share Document