Study on the quantitative relationship between soil in situ strength and drilling parameters

Lv, Xiangfeng; Hongyuan, Zhou; Xu, Lianman

doi:10.1007/s12665-018-7657-2

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The friction and wear between the bit and the coal is the main factor leads to the bit heating up. Therefore, the rising of the temperature for the bit is mainly composed of two parts: one is the shear heat generated by the coal shear failure under the action of the bit edge; and the other is the heat generated by the friction between the bit and the coal and the debris not discharged in time [34]. In the stage of II, the temperature rises rapidly, which corresponds to the process of drilling the CCS.…”

Section: Heat Transfer Model Of Coring Processmentioning

confidence: 99%

Temperature Variation Law of Core Tube Wall during Coring in Different Strength Coal Seams: Experiment and Modelling

et al. 2022

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Temperature is the primary factor affecting the law of coal gas desorption. When the core method is used to measure the coal seam gas content (CSGS), the temperature of the coal core sample (CCS) will increase. The heat generated by the core bit cutting and rubbing the coal during coring is transferred to the CCS through the core tube, resulting in the temperature rising of the CCS. Because the CCS entering the core tube during coring is a dynamic process, the temperature of CCS is difficult to measure. To solve this problem, the temperatures of the core tube wall during coring in the Jiulishan coal mine (JLS), Guhanshan coal mine (GHS) and Zhaogu coal mine (ZG) at the core depth of 20 m were measured by the self-designed temperature measuring device. The thermodynamic models of the core bit and the core tube during coring were established. The reliability of the model was verified by comparing the numerical simulation results with the field measurement results. The verified model was used to predict the temperature changes of the core tube wall during coring in different strength coal seams and different core depths. The results show that the temperature change of the core tube wall was divided into a slowly temperature rising stage Ⅰ, a fast temperature rising stage Ⅱ and a slowly temperature rising and slowly temperature falling stage Ⅲ, which correspond to the process of pushing the core tube, drilling the CCS and early stage and later stage of withdrawing the core tube, respectively. The maximum temperature of the core tube wall appears in the first 3 min of withdrawing the core tube, and increases with the core depth increasing. The temperature of the measuring point at the end of drilling the CCS and the maximum temperature during coring linearly increase with the core depth. The temperature heating rate of the core tube is negatively linear, with the coal seam strength during pushing the core tube wall process. However, the temperature heating rate of the core tube wall is positively linear with the coal seam strength during drilling the CCS process. This study can provide a basis for further research on the dynamic distribution characteristics of temperature in the CCS during coring, which is of profound significance to calculate the gas loss amount and CSGC.

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Section: Heat Transfer Model Of Coring Processmentioning

confidence: 99%

Temperature Variation Law of Core Tube Wall during Coring in Different Strength Coal Seams: Experiment and Modelling

et al. 2022

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“…e existence of strong mathematical correlation between the mechanical response and the mechanical parameters of rock and soil mass had been proved by many scholars through a large number of experiments [24][25][26][27]. Lv et al [20] conducted the theoretical analysis of the rotary penetration ground breaking process and pointed that with fixed drill bit geometric parameters, footage rate, and rotational speed the relationship between the mechanical responses from the rotary cone penetration (torque and propulsion) and formation bearing capacity is linear, which can be simplified as…”

Section: Research Eoretical Support and Methodmentioning

confidence: 99%

“…Wang et al [19] established the quantitative relationship model (DP-UCS model) between the drilling parameters and the uniaxial compressive strength of the rock through theoretical derivation and digital drilling experiments on entire rocks. Lv et al [20] proposed a new method about evaluating the bearing capacity of soils using drilling parameters. Digital rotary cone penetration technology is also widely applied to stratigraphic division, gradation of rock surrounding tunnels, and weak rock/soil deformation monitoring [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Manufactured Sand-Soil Bearing Capacity W-T-BC Model Based on Mechanical Response of Rotary Penetration

Zhang

Zhou

2019

Advances in Materials Science and Engineering

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Studies are lacking in establishing the quantitative relationship between the mechanical response and the rock and soil mechanical parameters by digital rotary penetration. In this study, based on the custom-built rock and soil strength parameter test device and the three-dimensional flexible boundary loading device, we conducted an experimental study of the manufactured sand-soil model with moisture contents of 5%, 10%, and 15% under different confining pressures (0, 0.12, 0.18, 0.24, and 0.42 MPa). Analysis was conducted on the influencing factors and laws of water content on the experimental results, and a quantitative relationship model (W-T-BC model) between the drilling torque and the bearing capacity of manufactured sand-soil under the condition of different water contents was established. Through failure detection verification on the manufactured sand-soil-filled subgrade of the Taihang Mountains Expressway in Beijing, the average conformity between the calculated value of the bearing capacity of the W-T-BC model and the standard experimental bearing capacity was 93.23%, which proved the validity and accuracy of the model. Finally, the rigid-soft interface grid body of sand-soil particles was analyzed. The reason why the manufactured sand-soil exhibited better stability than homogeneous soil under the action of external force in microcosmic aspect was expounded. The establishment of the W-T-BC model provided a scientific basis and important reference for further study of the relationship between mechanical response and force parameters under different conditions of different materials.

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“…e method adopted for sample preparation was the same as Lv et al [27]. e samples were designed to contain water contents of 5%, 10%, 15%, 20%, and 25% with a dry density of 1.83 g•cm − 3 .…”

Section: Sample Preparation and Key Parametersmentioning

confidence: 99%

Quantitative Detection of In‐Service Strength of Underground Space Strata considering Soil‐Water Interaction

Zhou

2020

Advances in Civil Engineering

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The in-service strength test of underground space strata is a hot issue in geotechnical engineering. In this study, we conducted mechanical analyses on the soil and the cutting bit involved in a rotary drilling process, which revealed the key factors influencing drilling. This allowed us to establish theoretical relationships among torque, propulsion, and soil strength parameters (i.e., unconfined compressive strength, shear strength, and cohesion). Moreover, with consideration of the effects of water content and geostatic stresses, we used an independently developed rotary drilling system with a 3D flexible boundary loading device to conduct 75 rotary drilling model indoor tests on silty clay in 15 groups. Based on the test results, we simplified the theoretical relationships and determined model parameters to obtain 15 quantitative relationships with 5 different water contents (4.8%, 9.7%, 14.8%, 19.6%, and 24.9%). Finally, through field application, we verified the quantitative relationships and we discussed their scope of application. The results showed it is feasible to predict the soil in-service strength based on rotary drilling parameters. Under the premise that water content is considered, the drilling parameters were found correlated linearly (correlation coefficients are all greater than 0.85) with strength parameters. In field application, absolute errors between the prediction and investigation results were less than 5%, satisfying engineering requirements.

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Study on the quantitative relationship between soil in situ strength and drilling parameters

Cited by 7 publications

References 11 publications

Temperature Variation Law of Core Tube Wall during Coring in Different Strength Coal Seams: Experiment and Modelling

Temperature Variation Law of Core Tube Wall during Coring in Different Strength Coal Seams: Experiment and Modelling

Experimental Study on Manufactured Sand-Soil Bearing Capacity W-T-BC Model Based on Mechanical Response of Rotary Penetration

Quantitative Detection of In‐Service Strength of Underground Space Strata considering Soil‐Water Interaction

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