A Validation Study for the Estimation of Uniaxial Compressive Strength Based on Index Tests

Kong, Fanmeng; Shang, Junlong

doi:10.1007/s00603-018-1462-9

Cited by 54 publications

(10 citation statements)

References 43 publications

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“…The Schmidt hammer procedure is a nondestructive and rapid test of hardness. Therefore, many researchers have developed numerous correlations between Schmidt hammer hardness, either linear or non-linear, and UCS and E t for diverse types of rocks (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35).…”

Section: Introductionmentioning

confidence: 99%

Assessing the uniaxial compressive strength and tangent Young’s modulus of basalt rock using the Leeb rebound hardness test

2020

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Basalt was used as an ornamental stone in any historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young’s modulus (Et) in the laboratory requires premium quality specimens with special core dimensions. This research focuses on correlations both UCS and Et with Leeb Rebound Hardness Test (LRH). In the laboratory, UCS, Et, and LRH were performed on 90 core samples extracted from 30 different rock boulders collected from the neighboring area of Umm al-Jimal, a historic city in northeastern Jordan. A strong power correlation with (R2 = 0.888, RMSE = 5.464) was found between non-destructive LRH value and UCS. On the other hand, a moderately strong linear regression with (R2 = 0.792, RMSE = 4.661) was found between Et and LRH. In conclusion, non-destructive LRHs can be used as indictors for evaluating both UCS and Et during the restoration of the historic city Umm al-Jimal and the rehabilitation of other existing structures.

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Section: Introductionmentioning

confidence: 99%

Assessing the uniaxial compressive strength and tangent Young’s modulus of basalt rock using the Leeb rebound hardness test

2020

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“…Substituting equation (6) into equation 5, the final expression of the relationship among the UCS of the surrounding rock σ c , torque, penetration, cutter number, and cutter diameter of the TBM can be rewritten as follows:…”

Section: Establishment Of the Parameter Of The Proposed Modelmentioning

confidence: 99%

“…Compared with traditional techniques such as drilling and blasting, the fullface rock tunnel boring machine (TBM) has gradually become the first choice for long and deep tunnel construction in recent years since it has many advantages, such as high quality, high efficiency, environmental protection, and small disturbance of surrounding rock [1,2]. As one of the most fundamental mechanical parameters, UCS has widely been applied in the process of TBM construction including assessment of rockmass rating (RMR) and Q TBM rockmass system, hazard assessment of rockburst classification or TBM jamming and assessment of the reasonable supporting design [3][4][5][6]. erefore, it is very important to quickly and accurately obtain the in situ UCS characteristics of the surrounding rock [7,8].…”

Section: Introductionmentioning

confidence: 99%

A New Evaluation Method for the Uniaxial Compressive Strength ahead of the Tunnel Face Based on the Driving Data and Specification Parameters of TBM

Tan

et al. 2019

Shock and Vibration

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Uniaxial compressive strength (UCS) is a very important fundamental mechanical parameter for TBM construction. In this work, a predictive model of UCS was proposed according to the TBM parameters including torque, penetration, cutter number, and cutter diameter. The parameter of the new proposed model was established by fourteen existed TBM tunnels’ construction data. To describe the relationships of UCS with PLSI of the Murree tertiary hard rocks, regression analyses have been conducted and a fitting equation with high-prediction performance was developed. Validation from the data of Neelum–Jhelum (NJ) TBM diversion tunnel were carried out. The absolute errors between predictive UCS and experimental UCS were presented. Through comparison, it can be concluded that the proposed calculation equation of UCS has a high accuracy for a certain rock type with UCS from 50 MPa to 200 MPa. For special hard rock or soft rock, a new calculation equation between UCS and TBM parameters should be studied furthermore.

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“…ISRM [7], Forster [20], Ghosh and Srivastava [21], Chau and Wong [22], Smith [23], Tsiambaos and Sabatakakis [24], Palchik and Hatzor [25], Singh et al [26], Kohno and Maeda [27], Li and Wong [28], S ¸ahin et al [16], Kaya and Karaman [29], Liu et al [30], Rabat et al [31], Xue et al [32], and Xie et al [33] considered that the two were linear with zero intercept. Andrea et al [9], Ulusay et al [12], Kahrama [34], Diamantis et al [35], Yilmaz [36], Kaya and Karaman [29], Heidari et al [37], and Kong and Shang [38] et al believed that the two are linear relations of non-zero intercept. Kahraman [34], Tsiambaos and Sabatakakis [24], Santi [39], Selçuk and Süleyman Gökçe [40], and Kallu and Roghanchi [41] considered the two to be a power function relationship.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mudstone’s Strength Characteristics in Deep‐Buried Coal‐Measure Formation: A Case Study of Permian Longtan Formation

et al. 2021

Shock and Vibration

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To investigate the strength characteristics of mudstone in deep-buried coal-measure formation, four types of experiments have been conducted: (i) the X-ray diffraction (XRD) test; (ii) the scanning electron microscope (SEM) scanning test; (iii) the point load strength index test; and (iv) the uniaxial compressive strength test. It was concluded that the mudstone of the deep-buried coal measures in the Longtan Formation is dominated by chlorite, quartz, and albite using the XRD test, of which chlorite is primary, accounting for 74.3%. It was found that the three minerals in the mudstone are unevenly distributed using the SEM scanning test, albite is irregularly distributed in chlorite, and quartz is present in the albite and chlorite. Sixty-five specimens were tested for the point load strength index. After processing the data using the method suggested by the International Society for Rock Mechanics and Rock Engineering(ISRM), it was found that the maximum value of Is(50) was 6.10 MPa, the minimum is 0.14 MPa, and 53% of the specimens’ Is(50) values are below 2.0 MPa. The RMT-150C rock mechanics testing machine was used to conduct uniaxial compression tests on six specimens. The maximum uniaxial compressive strength (UCS) value is 59.26 MPa, the minimum value is 31.77 MPa, and the average is 45.64 MPa. Linear fitting and logarithmic fitting are carried out for the correlation between UCS and Is(50). The goodness of fit R2 of the linear fitting is 0.863, and that of the logarithmic fitting is 0.919, indicating a strong correlation between them. When it is challenging to make standard specimens, Is (50) can be used to estimate UCS.

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A Validation Study for the Estimation of Uniaxial Compressive Strength Based on Index Tests

Cited by 54 publications

References 43 publications

Assessing the uniaxial compressive strength and tangent Young’s modulus of basalt rock using the Leeb rebound hardness test

Assessing the uniaxial compressive strength and tangent Young’s modulus of basalt rock using the Leeb rebound hardness test

A New Evaluation Method for the Uniaxial Compressive Strength ahead of the Tunnel Face Based on the Driving Data and Specification Parameters of TBM

Experimental Study on Mudstone’s Strength Characteristics in Deep‐Buried Coal‐Measure Formation: A Case Study of Permian Longtan Formation

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