The Mechanics Experimental Study of the Artificially Frozen Soil in Cretaceous Strata

2011 ◽  
Vol 94-96 ◽  
pp. 1844-1847 ◽  
Author(s):  
Hao Cui ◽  
Dong Wei Li ◽  
Ren He Wang
Keyword(s):  
Experimental Study ◽  
Creep Test ◽  
Strength Criterion ◽  
Freezing Temperature ◽  
Frozen Soil ◽  
Design Approach ◽  
Wall Strength ◽  
Strength Tests ◽  
Frozen Wall ◽  
Uniaxial Strength

Through the large number uniaxial strength tests and the creep test tests of the artificially frozen soil of Cretaceous strata, we obtained that the frozen wall in Cretaceous strata met the Moore - Coulomb strength criterion, and the artificially frozen soil strength increased from 6.5MPa in -5 °C to 12.0MPa in -15 °Cwith the freezing temperature decreased, Poisson's ratio from 0.35 down to -5 °C -15 °C at 0.18. Using viscoelastic-plastic theory we got the deep frozen wall strength and thickness of the Bojiang - Haizi mine in Cretaceous strata, practice showed that: the design approach in this paper was reasonable.

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

Experimental study on mechanical properties of shale rock and its strength criterion

2021 ◽  
Vol 14 (4) ◽  
Author(s):  
Baoyun Zhao ◽  
Yongfei Li ◽  
Wei Huang ◽  
Xiaoping Wang ◽  
Chao Chen
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Strength Criterion ◽  
Shale Rock

The Field Measure of Special Strata Freezing Temperature in West Area

2012 ◽  
Vol 170-173 ◽  
pp. 1207-1210
Author(s):  
Jun Hao Chen ◽  
Rui Zhang
Keyword(s):  
Engineering Design ◽  
Freezing Temperature ◽  
Design Requirement ◽  
Shaft Sinking ◽  
Design Requirements ◽  
Security Information ◽  
Frozen Wall ◽  
The Difference ◽  
Circle Tube ◽  
Field Measure

A new round of upsurge of mine well construction were set off in the west area, but there are many problems, this article through the field measure of special strata freezing temperature in Bo-jiang-hai-zi coal mine airshaft, use the freezing shaft sinking security information network visualization platform that developed by Anhui University of Science and Technology, analysis several different strata, obtain the overall temperatre decline rate, and compare the difference between in-site shaft well temperature and the calculation value at different position, and difference is very small, it shows that the platform can good response the actual situation. Through calculation, the frozen wall thickness, average of frozen wall temperature, shaft well temperature are meet the engineering design requirement, so propose that in west area at the freezing method mine well construction, the main purpose is waterproof, and use single circle tube freezing can satisfy engineering design requirements.

scholarly journals Elastic Modulus Calculation Model of a Soil-Rock Mixture at Normal or Freezing Temperature Based on Micromechanics Approach

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Hao Yang ◽  
Zhong Zhou ◽  
Xiangcan Wang ◽  
Qifang Zhang
Keyword(s):  
Composite Material ◽  
Elastic Modulus ◽  
Freezing Temperature ◽  
Calculation Model ◽  
Frozen Soil ◽  
Experimental Comparison ◽  
Mesoscopic Structure ◽  
Embedded Model ◽  
Single Inclusion ◽  
Rock Interface

Considering rock wrapped by soil in the mesoscopic structure of soil-rock mixture at normal temperature, a two-layer embedded model of single inclusion composite material was established to obtain the elastic modulus of soil-rock mixture. Given an interface ice interlayer attached between the soil and rock interface in the mesoscopic structure of soil-rock mixture at freezing temperature, a three-layer embedded model of double inclusion composite material and multistep multiphase micromechanics model was established to obtain the elastic modulus of a frozen soil-rock mixture. With the effect of structure pore with soil-rock mixture at normal temperature taken into consideration, its elastic modulus was calculated with the three-layer embedded model. An experimental comparison found that the predicted effect of the three-layer embedded model on the soil-rock mixture was better than that of the two-layer embedded model. The elastic modulus of soil-rock mixture gradually increased with the increase in rock content regardless of temperature. The increase rate of the elastic modulus of the soil-rock mixture increased quickly especially when the rock content is between 50% and 70%. The elastic modulus of the frozen soil-rock mixture is close to four times higher than that of the soil-rock mixture at a normal temperature.

scholarly journals Artificial Frozen Soil Bending Test and Bending Property

2020 ◽  
Vol 165 ◽  
pp. 03028
Author(s):  
Liu Tao ◽  
Huang Zhi ◽  
Zheng Zhigang ◽  
Hong Shaoyou ◽  
Li Jia ◽  
...  
Keyword(s):  
Earth Pressure ◽  
Bending Moment ◽  
Freezing Temperature ◽  
Test Methods ◽  
Frozen Soil ◽  
Bending Test ◽  
Frozen Soils ◽  
Temporary Support ◽  
Artificial Freezing ◽  
Ground Method

Artificial freezing ground method has been widely used in tunnels, metro and other projects, in the connecting passage in metro, the artificial frozen soil wall, which is formed by artificial freezing method, is often used as temporary support. The artificial frozen soil wall is in the joint action of pressure and bending moment, for it takes the upper pressure and lateral earth pressure at same time, so there may be tensile stress in the profile, which may cause brittle failure. At present, some scholars have carried out researches on the tensile strength with different test methods, but they are insufficiency and have a certain difference in stress state between the specimen and the actual support structure. A bending test instrument was designed and manufacture, which satisfies the code’s requirements, and reduces the error caused by poor contact between the specimen and loading device. Bending test on artificially frozen soils was launched using this instrument, and the test on influence law of moisture content and freezing temperature on artificially frozen soils’ strength was also launched. The conclusions can provide a reference for design and construction.

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