Long term stability assessment of Siah Bisheh powerhouse cavern based on displacement back analysis method

Ghorbani, M.; Sharifzadeh, Mostafa

doi:10.1016/j.tust.2009.02.007

Cited by 40 publications

(12 citation statements)

References 9 publications

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“…Many laboratory and field tests have confirmed that rock with high strength and integrity exhibits lower rheological properties [14][15][16][17][18]. In accordance with this, the grouting technique as a reinforcement method was applied to improve the physical and mechanical properties of the rock mass.…”

Section: Introductionmentioning

confidence: 88%

Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

Sun

Zhang

et al. 2019

Sustainability

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In maintaining the efficiency of coal mining, the stability of roadway plays a significant role, as it is closely related to the production of coal and the safety of personnel. In deep underground coal mines, the rheological deformation of roadway normally occurs, which affects its service life. To address this problem, in this paper, a novel high-efficiency Jet Grouting (JG) technique was presented, and its control effect on roadway stability was investigated. A creep test of a coal specimen in a laboratory scale was performed, and its creep behavior was revealed. The rheology of the coal mass surrounding the roadway was further analyzed according to the field-monitoring results of roadway deformation. A time-dependent numerical model with a Burger-creep visco-plastic model (CVISC) was established and validated by comparing the calculated displacement with in-situ measurement. The JG technique was tested in the field, and its applicability and practicability were confirmed. According to the validated model and field test results of JG, a numerical model with CVISC by JG support was established to analyze the effect of JG on the roadway. The results showed that the JG support can effectively reduce roadway deformation, optimize stress conditions, and reduce the extent of the plastic zone around the roadway. The rheological properties of the soft coal roadway were constrained and long-term stability was ensured. This pioneering work can guide the application of JG for the stability control of roadways and promote the sustainability of coal mining efficiently.

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Section: Introductionmentioning

confidence: 88%

Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

Sun

Zhang

et al. 2019

Sustainability

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show abstract

“…In this study, the burger‐creep viscoplastic model (CVISC) is used for simulating the time‐dependent property of coal according to recommendation . Rheological parameters are critical for analyzing the deformation behavior of coal mass.…”

Section: Numerical Modelingmentioning

confidence: 99%

Investigation on jet grouting support strategy for controlling time‐dependent deformation in the roadway

Sun

Zhang

2020

Energy Science & Engineering

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The efficiency of coal mining is seriously affected by roadway stability, as large time‐dependent deformation of roadway frequently occurs and needs to be maintained several times during its service life. Such rheological deformation was common in soft coal mass at Huaibei coalfield in China. To address this issue, in this study, the time‐dependent deformation of the soft coal roadway was analyzed and a new Jet Grouting (JG) technique was presented for controlling deformation. The time‐dependent deformation of the soft coal roadway was numerically simulated and validated. Based on the field test results and the verified model, a JG support model was established to examine its effect on roadway deformation. The JG support system can reduce the horizontal and vertical displacement of the roadway effectively and constrain the time‐dependent deformation of coal mass. The deformation rate and stabilization time of roadway decreased significantly by comparison with conventional support. This work presented a promising JG support scheme for controlling the time‐dependent deformation in the roadway in deep underground mine, which can greatly promote the JG design and application.

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“…This method was put forward in 1971 by K. T. Kavanagh and R. W. Clough [32]. Due to the maneuverability and reliability of the displacement measurement, in recent years the displacement back analysis method is applied widely in the field of geotechnical engineering [33][34][35][36][37]. The displacement inversion of m value is based on the compiling of the acquisition information of pile displacement.…”

Section: Displacement Back Analysis Of the Value Of Mmentioning

confidence: 99%

Horizontal Bearing Test and Optimization of m Value for Precast Piles in Alluvium Stratum of the Yellow River

Lyu

Chen

Zhao

et al. 2018

Mathematical Problems in Engineering

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For a pile foundation design, the value of proportional coefficient m to define the soil horizontal resist force is a significant parameter. However, different geological conditions and experimental environment have led to different m values. In this paper, an in situ test is firstly carried out on the horizontal bearing capacity of large-size precast square-piles. The piles deformation is then derived by using the optimization method from the measured data. Secondly a back analysis model is established to calculate the m value by using the simplex method, which reveals the evolution rule of the value of proportional coefficient m. Results show that the horizontal bearing characteristics of precast piles depend on the interaction force of piles and soils. The action mechanism of the soils around the piles is gradually developed with the increase in the concrete content. The horizontal critical load and the Eigenvalue of horizontal bearing capacity increased by 16.7% and 20%, respectively. It is also seen that the higher the content of the cement-soil around the piles and the longer the pile length, the bigger the m value obtained. The variation of the proportional coefficient m with the horizontal displacement of pile top is defined by three stages: rapid decaying stage, slow decaying stage, and balanced stage, respectively. The inverse analysis method on the proposed m value can accurately reflect the actual working state of piles and soils. In the depth of 3∼18m in the west of Ji'nan, the range of m value is recommended as 4∼6.58 MN⋅m −4 . When Δ takes 12mm, the values of m are consistent with the result from the back analysis. In summary, the obtained m value can be effectively used to guide the design of enclosure structure in the super deep foundation pit in the Yellow River alluvial stratum.

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Long term stability assessment of Siah Bisheh powerhouse cavern based on displacement back analysis method

Cited by 40 publications

References 9 publications

Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines

Investigation on jet grouting support strategy for controlling time‐dependent deformation in the roadway

Horizontal Bearing Test and Optimization of m Value for Precast Piles in Alluvium Stratum of the Yellow River

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