Multiscale Study of the Deterioration of Sandstone in the Three Gorges Reservoir Area Subjected to Cyclic Wetting–Cooling and Drying–Heating

Zhang, Chenyang; Dai, Zhenwei; Tan, Weijia; Yang, Yuting; Zhang, Linhao

doi:10.1007/s00603-022-02929-1

Cited by 19 publications

(5 citation statements)

References 46 publications

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“…Since the predisposing factors, such as the degree of RMD and RMD-related indices, change over time, the time-dependent susceptibility or risk of RMD-induced reservoir geohazards also can be determined. For the administration departments related with disaster mitigation and prevention, the above work will contribute to determining the order of priority when the risk control measures or treatments of some potential geohazards, such as multi-row stabilizing piles (Pei et al, 2022;Zhang et al, 2022;Zhang et al, 2023), are about to be implemented.…”

Section: Discussionmentioning

confidence: 99%

“…Since the implementation of the 175 m experimental impoundment in the TGRA in 2008, geological disasters caused by rock mass deterioration (RMD) in the HFB have grown more common (Huang et al, 2018;Tang et al, 2019;Zhang et al, 2022). By now, a series of studies related to the characteristics, mechanisms, consequences and evaluations of the RMD of the HFB have been carried out (Liu et al, 2008;Liu et al, 2009;Liu et al, 2018;Liu et al, 2020;Kang et al, 2019;Huang et al, 2019;Huang et al, 2020a;Huang et al, 2020b;Huang et al, 2021;Yao et al, 2020;Yan et al, 2020;Yin et al, 2020a;Yin et al, 2020b;Wang et al, 2020a;Wang et al, 2020b;Gu et al, 2021), and it is believed that the RMD of the HFB is an emerging adverse factor affecting the stability of the reservoir bank slopes.…”

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confidence: 99%

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A photographic method to identify reservoir geohazards induced by rock mass deterioration of hydro-fluctuation belt

Dai,

Zhang,

Zhang

et al. 2024

Front. Earth Sci.

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Potential geohazards triggered by the rock mass deterioration (RMD) of the hydro-fluctuation belt (HFB) in the Three Gorges Reservoir area (TGRA) severely threaten the lives and property of people, it is necessary and urgent to timely identify this kind of potential geohazard. Aiming at this issue, several typical evolution modes of potential RMD-induced geohazards were generalized, and an unmanned aerial vehicle (UAV) photographic method integrating the orthophotography, three-dimensional multi-angle oblique photography and high-precision digital elevation model (DEM) was proposed to early recognize the newly formed potential RMD-induced geohazards. By resolving the problem of poor precision in the orthophotographic images of high steep bank slopes, the proposed method improved the recognition reliability of potential reservoir geohazards in the HFBs. Taking the bank slopes from Zigui County to Badong County as the study area, 116 new potential RMD-induced geohazard sites were identified by the presented approach, including 64 and 52 sites on the left and right bank, respectively. Through field verifications, 17 and 19 sites on the left and right bank were found to be consistent with existing hazards, indicating the effectiveness of the proposed approach in avoiding the false and missing recognitions of potential RMD-induced reservoir geohazards at current levels of knowledge and technology. The study can provide a valuable reference for the early identification of RMD-induced geohazards in reservoir areas.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

A photographic method to identify reservoir geohazards induced by rock mass deterioration of hydro-fluctuation belt

Dai,

Zhang,

Zhang

et al. 2024

Front. Earth Sci.

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“…Seepage-induced landslides, such as the Taping ancient landslide (Zhang et al, 2021a) and Outang landslide (Wang et al, 2021), typically occur during rapid RWL drawdown. The primary mechanism for seepage-induced landslides is the sudden drop in water pressure at the slope's toe, thus generating the outward seepage force, as the pore water pressure does not dissipate easily (Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of large-scale reservoir landslides with double-sliding zones: insights from long-term field monitoring

Yang,

Zhang,

et al. 2024

Front. Ecol. Evol.

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A significant number of ancient landslides with double or multi-sliding zones exist in reservoir areas. However, understanding large-scale reservoir landslides with double-sliding zones remains limited due to the challenges of studying deformation along the sliding zone independently from surface deformation. In this study, the seepage and deformation characteristics of the Taping landslide were obtained through field investigations and long-term in-situ monitoring. For the first time, hydrological factors influencing double-sliding zones were revealed using an attribute reduction algorithm based on long-term field data. The results indicate that the Taping landslide undergoes significant step-like consistent creep deformation, exhibiting failure along double-sliding zones. For the toe part, reservoir water level (RWL) and precipitation are two critical hydrological factors triggering deformation. Shallow sliding is more susceptible to rainfall, while the deep sliding zone is more affected by RWL variations. In the rear part, precipitation has a greater impact than RWL. Daily precipitation is the primary hydrological factor affecting slope movement along the shallow sliding zone. However, accumulated precipitation over the previous seven days is the most crucial factor influencing slope movement along the deep sliding zone. During the RWL drawdown period, shallow sliding initially occurs at the toe, induced by the de-buttressing effect, while deep sliding occurs after the RWL reaches 145 m, induced by the downslope seepage force. Local damage and failure at the toe provide space for the instability of the rear part, reducing the anti-sliding force. Consequently, failure extends to the rear part. The findings of this study hold significant implications for gaining a deeper understanding of the deformation mechanisms of large-scale reservoir landslides with double-sliding zones and improving landslide management and mitigation strategies in reservoir area.

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“…Therefore, the study on the deterioration effect of sandstone strength under dry-wet cycles cannot be separated from the mesoscopic perspective. Zhang et al [15] proposed that the multiscale physical properties, including mineral compositions, microstructures, pore size distribution characteristics, permeability and macromechanical parameters, were markedly altered during the dry-wet cycles. Yao et al [16] conducted the Brazilian disk tests on argillaceous siltstone with dry-wet cycles, and proposed that the irreversible morphological changes in microstructures caused by the dissolution of calcite and albite were the main factor causing the decline of sandstone strength.…”

Section: Introductionmentioning

confidence: 99%

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles

Yang

Zhang

Deng

et al. 2023

Period. Polytech. Civil Eng.

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The rock mass in the hydro-fluctuating zone of the reservoir bank slope is under dry-wet cycles for a long time, which will cause the deterioration of rock mass and induce geological disasters. In this study, a series of dry-wet cycle tests on the argillaceous quartz sandstone in the Three Gorges Reservoir area was carried out. Then, after different dry-wet cycles, the sandstone specimens were used to conduct the Brazilian splitting, scanning electron microscope, and 3D laser scanning tests. Herein, we provided detailed physical and microscopy image data to analyze the deterioration effect of tensile strength and mesostructure deterioration process of sandstone. With the increase of dry-wet cycles, the tensile strength of sandstone initially decreases rapidly, and then the decline rate tends to slow down. The evolution laws of fractal dimension and porosity are also significantly consistent with the deterioration of tensile strength. Moreover, further mesostructural analysis has revealed the repeated “absorption and swelling-dehydration and contraction” of clay minerals. This results in the breakage of framework mineral quartz and the expansion and connectivity of internal cracks, which ultimately deteriorates sandstone’s tensile strength.

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Multiscale Study of the Deterioration of Sandstone in the Three Gorges Reservoir Area Subjected to Cyclic Wetting–Cooling and Drying–Heating

Cited by 19 publications

References 46 publications

A photographic method to identify reservoir geohazards induced by rock mass deterioration of hydro-fluctuation belt

A photographic method to identify reservoir geohazards induced by rock mass deterioration of hydro-fluctuation belt

Mechanism of large-scale reservoir landslides with double-sliding zones: insights from long-term field monitoring

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles

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