Analytical viscoelastic solution for frost force in cold-region tunnels

Lai, Yuanming; Wang, Hui; Wu, Zhong Chao; Liu, Songyu; Xuejun, Den

doi:10.1016/s0165-232x(00)00017-3

Cited by 81 publications

(22 citation statements)

References 4 publications

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“…The solutions of the stress and displacement for the unfrozen zone are equal to the superposition of the unloading model solution [25] (Figure 2) and the initial ground stress and displacement. Therefore, according to the thick-walled-cylinder equation [26] and considering the interaction between the frozen wall and the surrounding soil, the stress and displacement solutions for the unfrozen zone can be determined in combination with (3) and (4):…”

Section: Stress and Displacement Solutions For Unfrozen Soil Zonementioning

confidence: 99%

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Plastic Design Theory of Frozen Wall Thickness in an Ultradeep Soil Layer Considering Large Deformation Characteristics

Zhang

Yang

Wang

2018

Mathematical Problems in Engineering

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Frozen wall design theory is a key technique of the freezing method. However, previous design theories for a deep artificial frozen wall have neglected the influence of shaft flank displacement, that is, the displacement of the inner boundary of a frozen wall. Thus, the associated designs tend to be unsafe and earthwork excavations tend to be underestimated. This study builds a new design theory for frozen wall thickness which considers the influence of a large strain and obtains new solution formulas for the thickness and excavation radius before deformation occurs. The analytical results are compared with numerical calculation results by analyzing the influences of various parameters, such as crustal stress, cohesion and internal friction angle of frozen soil, and cohesion and internal friction angle of unfrozen soil as well as the elastic modulus of the ground, on the frozen wall thickness and the shaft flank displacement. The results indicate that the new formula is applicable for large deformation calculation with a strain of up to 0.2. The new formula can accurately calculate the amount of excavation earthwork and serves as a safer and more reasonable theoretical support for the design of frozen walls in ultradeep soil layers.

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Section: Stress and Displacement Solutions For Unfrozen Soil Zonementioning

confidence: 99%

“…According to the assumptions and definite solution conditions in Section 2, it is necessary to ensure that the surrounding soil does not attain the plastic state. At most, (26) satisfies the M-C yield criterion,…”

Section: Stress and Displacement Solutions For Unfrozen Soil Zonementioning

confidence: 99%

Plastic Design Theory of Frozen Wall Thickness in an Ultradeep Soil Layer Considering Large Deformation Characteristics

Zhang

Yang

Wang

2018

Mathematical Problems in Engineering

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“…The first type, which is based on continuum mechanics and the classical heat transfer theory, studies thermal-hydro-mechanical (THM) coupling of rocks under low temperature and the freezing and thawing cycles [25], as well as distribution laws of frost heaving pressure influenced by frost heaving and temperature on tunnel surrounding rocks in cold regions [26,27]. The second type studies basic mechanical properties of rocks under freezing and thawing cycles based on damage mechanics.…”

Section: Introductionmentioning

confidence: 99%

Effects of Freezing and Thawing Cycle on Mechanical Properties and Stability of Soft Rock Slope

Chen

et al. 2017

Advances in Materials Science and Engineering

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To explore the variation laws of mechanical parameters of soft rock and the formed slope stability, an experiment was carried out with collected soft rock material specimens and freezing and thawing cycle was designed. Meanwhile, a computational simulation analysis of the freezing-thawing slope stability was implemented. Key factors that influence the strength of frozen rock specimens were analyzed. Results showed that moisture content and the number of freezing-thawing cycles influenced mechanical parameters of soft rock significantly. With the increase of moisture content, cohesion of frozen soft rock specimens presents a quadratic function decrease and the internal friction angle shows a negative exponential decrease. The stability coefficient of soft rock material slope in seasonal freeze soil area declines continuously. With the increase of freezing and thawing cycle, both cohesion and internal friction angle of soft rock decrease exponentially. The higher the moisture content, the quicker the reduction. Such stability coefficient presents a negative exponential reduction. After three freezing and thawing cycles, the slope stability coefficient only changes slightly. Findings were finally verified by the filed database.

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“…So far, most of these models consider that the whole region can be separated into a frozen and an unfrozen zone. The frost heave force resulting from the penetration of the phase front surface that separate these two zones is then estimated from the liquid-to-ice volume change [19,20]. The complexity of these models depends intrinsically on the constitutive behavior of the surrounding rock mass.…”

Section: Introductionmentioning

confidence: 99%