Research on Excavation and Stability of Deep High Stress

Research on Excavation and Stability of Deep High Stress

Quantifying the effect of in-situ stresses and pit depth

Similarly, the impact of in-situ stress magnitudes in slope stability is still uncertain. High horizontal stresses and increased depths can lead to unfavorable stress conditions, inducing rock mass damage and strength loss. The main goal of this research is to assess the effect of increased mining depth and in-situ stresses on slope stability.

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Deep Mining: A Rock Engineering Challenge | SpringerLink

Apr 13, 2019 · To ensure the stability of the mine infrastructure and the functionality of the mining excavations, to protect the workforce from rock falls and to facilitate the mining operations, it is necessary to support the mining excavations. In deep mines, excavation support is one of the most important, labour-, material- and resource-intensive activities.

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Evolution of excavation-induced critical stress ring and

Jan 07, 2022 · After roadway excavation, a ring structure with increased maximum stress is formed naturally in surrounding rock, namely the pressure circle or load-bearing ring. The rock mass in the elevated stress zone bears the load of itself and external range. In this study, the scope of the critical stress ring in surrounding rock is defined based on pressure circle theory. …

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Rapid Excavation and Stability Control of Deep Roadways

Jan 07, 2022 · Up to10%cash back · After roadway excavation, a ring structure with increased maximum stress is formed naturally in surrounding rock, namely the pressure circle or load-bearing ring. The rock mass in the elevated stress zone bears the load of …

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Stress, instability and design of underground excavations

When the stress-induced risks to a projects warrant it, in situ stress must be measured. However, as the stress-induced risks increase, i.e., the stress magnitudes approach the rock mass strength, the confidence in commonly used stress measurement techniques decrease.The design of underground openings at depth requires knowledge of the in situ stress state, yet it is for these …

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Prediction of behaviour of a deep excavation in soft soil

Bhatkar et al. Prediction of behaviour of a deep excavation in soft soil 12 International Journal of Geotechnical Engineering 2017 VOL 11 NO 1 Hardin and Black 1969 and Truty 2009). For the estimation of HSSmall model stiffness m was varied between 0.5 and 1.0 to obtain the most conservative values.

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[PDF] Modelling Study on the Geotextile, Geogrid and

Changing the natural conditions of soil creates unexpected stress increments in slope stability projects, which are required high amount of soil excavation near the highways and railways or braced cut systems. Some safety problems can occur during this application under different loading cases. In addition, slope stability design requires economical solutions.

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Experimental research on the structural instability

We study the structural instability mechanism and effect of a multi-echelon support in very-deep roadways. We conduct a scale model test for analysing the structural failure mechanism and the effect of multi-echelon support of roadways under high horizontal stress. Mechanical bearing structures are …

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Based on the Geostress to Research Slope Stability in the

Further excavation is extraordinary significant to the sustainable development of mine. For the rock slope, three-dimensional geostress in the deep mining area are presented complex and high, which were caused by previous excavation. Also, it is important to obtain the accurate geostress in mining area, which is the necessary precondition for determining the remaining ore mining …

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Optimization Analysis of Excavation Procedure Design of

It can be seen that the existing excavation procedure design method is more and more unsuitable for stability control of underground cavern excavation of large hydropower stations with increasingly complex construction conditions, especially in the case of high in situ stress and low rock strength–stress ratio.

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Stress, instability and design of underground excavations

Oct 01, 2003 · Typically, the minor principal stress decreases near large excavations while the major principal stress may increase or decrease as illustrated by Fig. 12. The minimum and maximum stress levels for a tunnel in the virgin stress field are 0.36 and 0.52, respectively. Mining-induced stress changes, in general, aggravate the stress level.

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Field Study on Deformation and Stress Characteristics of

Oujiang River North Estuary Bridge in Wenzhou is the world's first double-deck suspension bridge under construction with three-tower and four-span. It is the first time to build large open caisson foundation in the deep marine soft clay in estuary with strong tide, extending the application scope of caisson. To study the deformation and stress characteristics of large open caisson …

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Stability of deep underground openings through large fault

The stability of underground openings is pivotal to sustainable safe mining in underground coal mines. To determine the stability and tunneling safety issues in 800-m-deep underground openings through large fault zones in argillaceous rocks in the Guqiao Coal Mine in East China, the pilot industrial test, laboratory experimentation, and field measurements were used to …

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20 years of excavation response studies at AECL's

After analyzing the process of release of in-situ stress induced by rock mass excavation with the method of drill and blast and determining the duration of the release of in-situ stress, it is found that the release of in-situ stress induced strain rate can reach a magnitude of 10 −1 –10 1 /s or higher if the initial in-situ stress has a

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Prediction of behaviour of a deep excavation in soft soil

Bhatkar et al. Prediction of behaviour of a deep excavation in soft soil 12 International Journal of Geotechnical Engineering 2017 VOL 11 NO 1 Hardin and Black 1969 and Truty 2009). For the estimation of HSSmall model stiffness m was varied between 0.5 and 1.0 to obtain the most conservative values.

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Research on the Reasonable Strengthening Time and

To achieve rapid excavation and control the stability of deep roadways, a new support system was proposed and constructed in a roadway at a depth …

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Role of stress, slenderness and foliation on large

Jul 01, 2021 · Large anisotropic deformation and excavation closure, especially under high-stress conditions, are expected if the excavation is located in a foliated or thin-bedded rock mass. In this research, the behaviour of excavations under deep and high-stress conditions was investigated and categorised.

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MODELLING THE SENSITIVITY OF UNDERGROUND SPACE …

stability to the in situ stress uncertainties: case study at the Bukov underground research facility phase II (Rožná mine, Czechia). Acta Geodyn. Geomater., 18, No. 3 (203), 319–334, 2021. DOI: 10.13168/AGG.2021.0022 1. INTRODUCTION Deep geological repositories (DGRs) have been constructed all over the world for disposal of high-

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[PDF] Modelling Study on the Geotextile, Geogrid and

Changing the natural conditions of soil creates unexpected stress increments in slope stability projects, which are required high amount of soil excavation near the highways and railways or braced cut systems. Some safety problems can occur during this application under different loading cases. In addition, slope stability design requires economical solutions.

Get a Quote
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