A new rock mass classification system QHLW for high-level radioactive waste disposal

Chen, L.; Wang, J.; Zong, Z.H.; Liu, J.; Su, Rui; Guo, Yonghai; Jin, Y.X.; Chen, W.M.; Ji, Ruili; Zhao, Haibin; Wang, X.Y.; Tian, Xiaomin; Luo, Huiwu; Zhang, M.

doi:10.1016/j.enggeo.2015.02.006

Cited by 37 publications

(8 citation statements)

References 15 publications

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“…In recent years, with the continuous development of science and technology, geotechnical engineering has developed from surface to underground. A variety of rock mass quality classifications methods have proposed according to the project category, and the evaluation factors and criteria are different [5, 6]. For the same project, different rock mass quality classifications method may have different evaluation result [7].…”

Section: Introductionmentioning

confidence: 99%

Classification Method of Rock Structure and Rock Mass Quality of Surface Granite: Geological Disposal of High-Level Radioactive Waste in China

Xiang

Cheng

Cadasse³

2022

Adsorption Science & Technology

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The engineering quality of rock mass is a key factor to evaluate the long-term stability and safety of high-level radioactive waste (HLW) geological disposal engineering and is also the important basis for disposal site selection. Traditional rock mass quality classification methods, such as RMR and Q , can meet underground engineering but still should be studied further for the site evaluation in the HLW disposal engineering. In this study, rock mass structure rating (RMSG) was proposed based on the quantitative control index of rock mass structure which was from the rock mass quality classification methods. Based on the statistical results of rock mass structure, the relationship between the number of RMSG and the modified RMR ( F RMR ) and Q ( F Q ) was established, China, as a case study. Results from this study show that RMSG is linearly related to F RMR and negatively exponential to F Q . The research results can solve the evaluation of rock mass quality for HLW geological disposal engineering, and the addition of more engineering examples over time will enable further verification.

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Section: Introductionmentioning

confidence: 99%

Classification Method of Rock Structure and Rock Mass Quality of Surface Granite: Geological Disposal of High-Level Radioactive Waste in China

Xiang

Cheng

Cadasse³

2022

Adsorption Science & Technology

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“…Simultaneously, based on the results of parameter sensitivity analysis and experimental measures, the value range of these three parameters could be initially designed. e value ranges of inversed parameters were as follows: E c (20 GPa and 30 GPa), K n /K s [1,3], and σ c (30 MPa and 50 MPa). Moreover, according to other research [29,30], the friction coefficient of the particles μ and the shear strength of the parallel bond τ c can be set to 0.5 and 90 MPa, respectively.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…With the rapid development of rock engineering, especially the tunnel construction for high-speed rails [1], shale gas exploitation [2], and construction of protective engineering [3], the working efficiency and life of large rock breaking machinery such as the tunnel boring machine (TBM) are widely concerned. In the process of rock breaking of the TBM, hard rock is very prone to brittle failure, which is easy to cause disasters such as low pressure and rock burst.…”

Section: Introductionmentioning

confidence: 99%

An Effective Inverse Procedure for Identifying DEMParameters of Rock‐Like Materials

Chen

Qian

et al. 2019

Mathematical Problems in Engineering

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This study aims to identify discrete element model parameters of rock-like materials. An inverse procedure is developed to determine the discrete element model parameters from experimental measurements. This involves the solution of an inverse problem through minimizing the misfit function which describes the error between numerical computation and experiment by an optimization procedure. In this procedure, the discrete element method is adopted as the numerical calculation method of the forward problem. The orthogonal experimental design is used for parameter sensitivity analysis. Besides, the approximation model with radial basis function is adopted instead of the actual calculation model to reduce the time of forward calculation. The ant-colony optimization algorithm is employed as the inverse operator. Therefore, the parameters of the discrete element model are optimized by this procedure. The three-point bending experiment with discrete element simulation is provided to verify the validity and accuracy of the inversion results. The results indicate that it can rapidly obtain the available and reliable model parameters just through a few sets of experimental data. As a result, this inverse procedure can be applied more widely to parameter identification of the discrete element model for brittle materials.

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“…An appropriate modelling on the mechanical behavior of granite is of great importance for site selection and design of the repository [9][10][11][12][13]. Specially, it should be noted that the heat induced by the nuclear waste may have considerable influences on the mechanical behavior of the host rock, so the thermal effect cannot be ignored [8,12,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Mobilized Mohr-Coulomb and Hoek-Brown Strength Parameters during Failure of Granite in Alxa Area in China for High-Level Radioactive Waste Disposal

Cheng

Zheng

2019

Energies

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Strength parameters of the host rock is of paramount importance for modelling the behaviors of underground disposal repository of high-level radioactive waste (HLW). Mobilization of strength parameters should be studied for a better understanding and modelling on the mechanical behaviors of the surrounding rock, considering the effect of temperature induced by the nuclear waste. The granite samples cored from NRG01 borehole in Alxa candidate area in China for HLW disposal are treated by different temperatures (T = 20 °C, 100 °C and 200 °C), and then are used to carry out a series of uniaxial and tri-axial compression experiments under various confining pressures (σ3 = 0, 5, 10, 20, and 30 MPa) in this study. With the recorded axial stress—axial strain and axial stress—lateral strain curves, mobilization of both Mohr-Coulomb and Hoek-Brown strength parameters are analyzed with the increasing plastic shear strain. It has been found that NRG01 granite samples show generally similar cohesion weakening and friction strengthening behaviors, as well as the non-simultaneous mobilization of Hoek-Brown strength parameters (mb and s), under the effect of various treatment temperatures. Furthermore, the samples treated by higher temperatures show lower initial values of cohesion, but their initial friction angle and mb values are relatively higher. This should be mainly owing to the thermally induced cracks in the samples. This study should be helpful for a better modelling on the mechanical behaviors of NRG01 granite samples as the host rock of a possible HLW disposal repository.

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A new rock mass classification system QHLW for high-level radioactive waste disposal

Cited by 37 publications

References 15 publications

Classification Method of Rock Structure and Rock Mass Quality of Surface Granite: Geological Disposal of High-Level Radioactive Waste in China

Classification Method of Rock Structure and Rock Mass Quality of Surface Granite: Geological Disposal of High-Level Radioactive Waste in China

An Effective Inverse Procedure for Identifying DEMParameters of Rock‐Like Materials

Mobilized Mohr-Coulomb and Hoek-Brown Strength Parameters during Failure of Granite in Alxa Area in China for High-Level Radioactive Waste Disposal

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