A fully coupled thermo-hydro-mechanical model for fractured rock masses in cold regions

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.

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

“…It is necessary to obtain the basic parameters of soil to deeply understand the hydro and dynamic properties of soil (Liu et al, 2023). The basic parameters of the coral sands are provided in Table 1.…”

Section: Properties Of Coral Sandsmentioning

confidence: 99%

Liquefaction evaluation method of coral sand: Case study on the ports in Indonesia

Ji¹,

Ye²,

Zhang³

2023

While the liquefaction evaluation methods of siliceous sand have undergone extensive studies, few research efforts were conducted to establish standard for the liquefaction susceptibility of coral sand. The current study develops an innovative method to evaluate the liquefaction potential of coral sand. Specifically, the method integrates the grain-size distribution of coral sand, effective overburden stress and equivalent seismic acceleration. Scanning electron microscopy image of coral sand was processed to reveal the microstructural characteristics of coral sand. The correction equation for standard penetration resistance of coral sand in Indonesian ports was given based on geotechnical investigations, and the recommended values of correction factors were proposed for the regions lacking relevant data in the previous period. The process for liquefaction evaluation method of coral sand was described and applied to evaluate the liquefaction potential of coral sand in Indonesian port projects. This study demonstrates the feasibility of integrating standard penetration test and grain-size distribution for liquefaction evaluation of coral sand.

“…Currently, the methods of tunnel stability are not limited to a narrow field. These methods (Sukkarak et al, 2019;Shiau and Al-Asadi, 2020;Kumar and Jain, 2021;Li T. Z. et al, 2021;Liu et al, 2022b;Zhang et al, 2022b;Man et al, 2022;Xue et al, 2022;Xue et al, 2023) are not only applied to but also inspired by other fields of research. The researchers of tunnel stability problems still have the power of sustainable development.…”

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

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.