Intelligent Back Analysis of Rheology Parameters of Left Bank High Slope Rock Masses at Longtan Hydropower Station in China

Hu, Baodan

doi:10.1061/40863(195)6

Cited by 2 publications

(2 citation statements)

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“…1), rock unloading tensile ssures in the slopes of the Lenggu Hydropower Station (Fig. 2), cavity ssures formed by the sanding of dolomite in the Meigu Hydropower Station [7], and the existence of large-scale dissolution cavities, coal holes, and early tectonic ssure cavities in the Daguangbao landslide cavities [13].…”

Section: Generalised Modelling Of Slopes With Cavitiesmentioning

confidence: 99%

Study on the mechanism of excess void gas pressure in slopes under strong earthquake conditions

Wang,

Song,

Xiao

et al. 2024

Preprint

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Under strong earthquake conditions, excess void gas pressure is generated in slopes with cavities (without water), which accelerates tension cracking at the edges of the cavities and thus promotes slope failure. In this paper, a generalised model of a slope with cavities is proposed to explore the development of natural slope cavities, and large-scale physical shaking table tests and corresponding PFC numerical simulation tests are performed to study the formation mechanism of excess void gas pressure at depth. The following findings are obtained: (1) Sudden vibration loads of a certain intensity or sudden changes in the volume of the cavity can lead to the generation of excess void gas pressure in the cavity; (2) The deformation and damage of slopes with cavities under strong earthquake conditions can be divided into three stages: a. rupture of the top of the slope and the edges of the cavities; b. excess void gas pressure in the cavities, promoting crack propagation; and c. crack penetration, leading to overall damage of the slope; (3) Tension cracks caused by excess void gas pressure change the structure of the slope body, weaken the shear strength of the structural surfaces in the rock mass, and reduce the stability of the slope body. The above results are highly important for studying the initiation mechanism of seismically induced landslides on slopes.

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Section: Generalised Modelling Of Slopes With Cavitiesmentioning

confidence: 99%

Study on the mechanism of excess void gas pressure in slopes under strong earthquake conditions

Wang,

Song,

Xiao

et al. 2024

Preprint

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“…Yan et al [10] believed that the metal sulfide minerals in the mining area were oxidized into sulfuric acid water which then dissolved the dolomite into sand (powder). Hu [11] and Zhao, et al [12,13] conducted an indoor dissolution test of dolomite and the study of a micro-dissolution mechanism to clarify that the micro-dissolution characteristics of dolomite were mainly manifested in the first dissolution of various joints and fissures in crystals under chemical action, thus the strengths of bonding forces between them were reduced. Then, mechanical disintegration and falling-off occurred under the physical action of water flow, and finally dolomite sands (powders) were generated.…”

Section: Introductionmentioning

confidence: 99%

Study on Construction and Reinforcement Technology of Dolomite Sanding Tunnel

Wang

et al. 2022

Sustainability

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The No. 2 conduit of the Xiaopu Tunnel in the Yuxi section of central Yunnan’s water diversion project is taken as the research object, starting from the geological conditions along with the characteristics, formation mechanism and evolutionary model of dolomite sanding. This paper discusses the engineering problems of the project’s tunnels with dolomite sanding in the water-rich section, and its corresponding engineering reinforcement plan. It was found that in the tunnel section with normal level of dolomite sanding, there was no water seepage, where measures such as advanced small conduit, mechanical excavation, short grubbing and strong support could all be adopted for safe passage. Even in the water seepage section of the weak dolomite sanding tunnel, the surrounding rock was found in close interlock with strong self-stability. The excavation and support were implemented according to the category of normal surrounding rock. In the water-rich sections with strong and intense dolomite sanding, gushing of water and sand were quite frequent, with developed fissures, broken rock masses and rich waters. During the engineering operation, phosphoric acid and sodium silicate slurry in addition to urea formaldehyde resin and oxalic acid slurry plus Malisan and liquid catalyst slurry were first prepared for water plugging. Then, pure water slurry was used for surrounding rock reinforcement, which exerted an excellent effect. This method can provide reference for reinforcing tunnels of sandy dolomite in other areas of projects.

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Intelligent Back Analysis of Rheology Parameters of Left Bank High Slope Rock Masses at Longtan Hydropower Station in China

Cited by 2 publications

References 0 publications

Study on the mechanism of excess void gas pressure in slopes under strong earthquake conditions

Study on the mechanism of excess void gas pressure in slopes under strong earthquake conditions

Study on Construction and Reinforcement Technology of Dolomite Sanding Tunnel

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