Method for Evaluating the Equivalent Thermal Conductivity of a Freezing Rock Mass Containing Systematic Fractures

Liu, Naifei; Li, Ning; Li, Guofeng; Song, Zhanping; Wang, Shuangjie

doi:10.1007/s00603-022-03038-9

Cited by 44 publications

(24 citation statements)

References 19 publications

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“…The softer clastic rock in the middle section is in the runoff and drainage area of carbonate fissure water. The rock mass structure of clastic rock in this area is broken, and provides abundant groundwater migration and recharge channels (Liu et al, 2022a) and favorable conditions for the development of the rainfall slip effect (Liu et al, 2022b). Earthquakes frequently occur in southwestern Yunnan.…”

Section: Types Of Landslides and Formation Mechanisms Of The Nanpeng ...mentioning

confidence: 99%

The formation mechanism of landslides in typical fault zones and protective countermeasures: A case study of the Nanpeng River fault zone

Li¹,

Hongri²,

Huang³

et al. 2023

Front. Earth Sci.

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Landslides are frequent in the Nanpeng River fault zone in southwest Yunnan. Based on a Zhen Qing Expressway survey, the geological conditions and characteristics of landslides in this area were studied. The conclusions are as follows: 1) the geological background was the internal cause of local highly steep slopes and broken rock masses. The main landslide types in study area are fault-type and accumulation landslides. 2) The formation of fault-type landslides is related to endogenous causes, such as tectonic movements, but they are less easily triggered than accumulation landslides. Accumulation landslides are related to broken rock masses and are sensitive to external factors such as rainfall and artificial unloading. 3) The coordinated control of permanent support engineering, local deformation control, and overall support reinforcement should be considered as preventive measures.

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Section: Types Of Landslides and Formation Mechanisms Of The Nanpeng ...mentioning

confidence: 99%

The formation mechanism of landslides in typical fault zones and protective countermeasures: A case study of the Nanpeng River fault zone

Li¹,

Hongri²,

Huang³

et al. 2023

Front. Earth Sci.

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show abstract

“…Therefore, tunnel stability evaluation is facing challenges i.e., rapid response, decision-making judgment, prevention and disposal, and the need for further in-depth optimization. At present, the research methods of tunnel stability can be summarized as the empirical, theoretical, experimental, and numerical analysis methods (Song et al, 2001;Osman et al, 2006;Son and Cording, 2008;Yang and Yang, 2009;Fraldi and Guarracino, 2010;Yang and Huang, 2013;Shiau and Al-Asadi, 2020;Song and Marshall, 2020;Tan et al, 2020;Tyagi et al, 2020;Yertutanol et al, 2020;Li L. P. et al, 2021;Pandit and Sivakumar, 2021;Liu et al, 2022a;Zhang et al, 2022a;Zhang Z. et al, 2022;Hao et al, 2022;Lu et al, 2022;Qin et al, 2022;Li et al, 2023;Xue et al, 2023). The primary purpose of these methods is to obtain more effective and accurate stability analysis results and provide a more reliable basis for the actual tunnel construction and operation decisions.…”

Section: Introductionmentioning

confidence: 99%

The stability evaluation of clay tunnels via the non-linear deterioration of physical and mechanical properties of surrounding rocks

Huang

Liu²,

Ma³

et al. 2023

Front. Earth Sci.

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Simple, fast, and reliable methods for the stability evaluation of tunnels can facilitate the construction and development of tunneling projects. The problems related to tunnel stability at this stage can be well analyzed via theoretical analysis method, model test method, or numerical analysis method. On the other hand, those methods are hard to be effectively analyzed these projects with higher importance, shorter decision and design period, and more urgent construction period. This paper proposed research works on the stability evaluation of clay tunnels. Firstly, a state function with the variables of stress and strain state is presented to predict the stress and strain states of surrounding rocks caused by tunnel excavation, which characterize the physical-mechanical state of surrounding rocks (also called stability state). Secondly, the non-linear deterioration of the physical and mechanical properties of surrounding rocks will be simulated, and the expressions and calculation methods of the tunnel stability reserve factor will be yielded. Finally, the results of the proposed method were compared with the strength reduction method and the limit equilibrium method with a clay tunnel example. The comparison between the three feature points of the arch crown, sidewall, and arch bottom showed that the stability reserve factor of the clay tunnel was smaller than those of the strength reduction method and the limit equilibrium method. The values of limit displacement obtained by the proposed method were closer to the field monitoring data than that of the strength reduction method. Therefore, this study could be better applied to the stability evaluation of clay tunnels.

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“…Mudstone has properties between those of hard rock and quaternary settlement, as well as its own characteristics. Macro and micro research on the mechanical properties of mudstone have revealed engineering properties of mudstone including poor diagenesis, weak cementation, easy weathering, weak interbedding, and easy expansion, disintegration, and softening when water is encountered (Zhao et al, 2018;Hashemnejad et al, 2021;Zeng et al, 2021;Liu et al, 2022a). Due to the special engineering nature of mudstone, insufficient bearing capacity of driven piles in mudstone foundations occurs frequently (Xu and Li, 2004;Terente et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Bearing capacity of driven pile and determination of inhomogeneous mudstone around the pile

et al. 2023

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Whether the inhomogeneity of mudstone foundation leads to abnormal bearing capacity of the driven pile remains controversial. This study introduces the standard penetration test hammering number and needle penetration strength for quantitative analysis by macroscopic observation of the engineering field on the mudstone stratum self-structure and microscopic observation by simple and feasible electronic magnification. The analysis of typical engineering examples demonstrated that the abnormal bearing capacity of piles in the mudstone stratum was related to mudstone inhomogeneity. This study also proposes a method of evaluating mudstone uniformity using the heterogeneous index η, in which η > 2 suggests the need for engineering measures. These findings assist in determining a reasonable solution to the problem of abnormal bearing capacity at driven piles in mudstone foundations.

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Method for Evaluating the Equivalent Thermal Conductivity of a Freezing Rock Mass Containing Systematic Fractures

Cited by 44 publications

References 19 publications

The formation mechanism of landslides in typical fault zones and protective countermeasures: A case study of the Nanpeng River fault zone

The formation mechanism of landslides in typical fault zones and protective countermeasures: A case study of the Nanpeng River fault zone

The stability evaluation of clay tunnels via the non-linear deterioration of physical and mechanical properties of surrounding rocks

Bearing capacity of driven pile and determination of inhomogeneous mudstone around the pile

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