Evaluation of equivalent crack propagation length and fracture energy of two commonly used rock fracture toughness test configurations based on Bažant’s size effect law

Xie, Qin; Liu, Xiling; Li, Fan; Visualisation, Shuquan Peng; Zeng, Yuan

doi:10.1016/j.engfracmech.2023.109067

Cited by 16 publications

(5 citation statements)

References 56 publications

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“…However, it has limitations when accounting for complex fluid-rock interactions and inelastic deformation. The input data for the target shale gas reservoir is provided by Sonatrach Company upon reasonable request and analyzed using Abaqus software for both methods (conventional and rectangular hydraulic fracturing),as presented in Table 1 [24]. The study area for this research is Salah, located in Algeria; its geographic information is displayed in Figure 2 [25].…”

Section: Methodsmentioning

confidence: 99%

Enhancing Water Management in Shale Gas Extraction through Rectangular Pulse Hydraulic Fracturing

Badjadi,

Zhu,

Zhang

et al. 2023

Sustainability

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Although conventional hydraulic fracturing techniques have revolutionized shale gas development, they have raised concerns regarding water management and environmental impacts. This research introduces an innovative step-rectangular pulse hydraulic fracturing method to optimize water usage and reduce environmental hazards in shale gas extraction. The method involves the application of lower-energy fluid in a step-rectangular pulse pattern, which results in higher pressures, more intricate fractures, and improved water management. A comprehensive analysis of the propagation and attenuation characteristics of this technique is conducted using a combination of a two-dimensional pulse transient flow equation with damping, software numerical simulations, and theoretical analysis. The study reveals that the step rectangular pulse hydraulic fracturing method offers superior pressurization and more complex fracture networks in shale reservoirs while lowering water consumption by 20% less than conventional methods and increasing shale gas production by 12%. Through identifying optimal pulse parameters, this research provides valuable guidance for field implementation, promoting efficient water management and environmental sustainability in hydraulic fracturing operations. This novel approach to hydraulic fracturing has the potential to significantly advance the industry’s efforts to address water management challenges and mitigate environmental risks associated with shale gas extraction.

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Section: Methodsmentioning

confidence: 99%

Enhancing Water Management in Shale Gas Extraction through Rectangular Pulse Hydraulic Fracturing

Badjadi,

Zhu,

Zhang

et al. 2023

Sustainability

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“…When the values of CA and CR are both greater than 0.7 (Fornell and Larcker, 1981;Hatcher and O'Rourke, 2013), internal consistency and reliability are reasonable. When the values of CA and CR are both greater than 0.6 revealing poor reliability but acceptable (Huang et al, 2013;Xie et al, 2023). Factor loadings (FL) of the measured items on the factor and average variance extracted (AVE) for the factor are used to evaluate the convergent validity of the measurement model.…”

Section: Reliability and Validity Testmentioning

confidence: 99%

Assessing the intention to accept inquiry-based teaching pedagogy among Chinese university students: an extension of technology acceptance model

Hu,

Wang,

Wang

et al. 2024

Front. Psychol.

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IntroductionDue to the limitations of traditional didactic teaching, inquiry-based teaching has attracted increasing attention and has become an important content of curriculum teaching reform in college education. Nevertheless, it is vital to investigate students’ subjective acceptance of inquiry-based instruction and its influencing factors before inquiry-based teaching methods are widely implemented.MethodsIn light of this, taking into account the psychological factors of students, an acceptance model of inquiry-based teaching pedagogy was established based on the extended technology acceptance model (TAM). Three additional variables, namely self-efficacy, implementation quality, and risk perception, were incorporated into the TAM. Firstly, subjective evaluation data of the influencing factors of inquiry teaching acceptance were obtained through a network questionnaire survey from university students in Guangdong, China, using snowball sampling and convenient sampling. A total of 485 valid questionnaires were retrieved, with an effective response rate of 88.2%. Then, internal consistency and reliability, convergent validity and discriminant validity of the model and its hypothesis were tested with reliability and validity tests. Finally, path analysis was used to examine key determinants of students’ acceptance of inquiry teaching and moderators.ResultsResults indicated that the constructed model can explain the acceptability of inquiry teaching for college students by 88.6%; Attitude has a positive significant impact on behavioral intention; Perceived ease of use indirectly affects behavioral intention through perceived usefulness, while perceived usefulness indirectly affects behavioral intention through attitude; self-efficacy not only directly affects behavioral intention but also indirectly affects behavioral intention through implementation quality; implementation quality indirectly affects behavioral intention through perceived usefulness and attitude; students’ risk perception of inquiry-based teaching has no negative impact on behavioral intention.ConclusionOverall, this study has implications for policymakers, teachers or learners in terms of the implementation and promotion of inquiry-based teaching in college classroom.

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“…We used the IBM Statistical Package for the Social Sciences (SPSS) program to obtain the Cronbach's Alpha values because Cronbach's Alpha guarantees the dependability of the coefficient or the internal consistency of the scales (Hernández et al, 2023). Furthermore, an alpha value of equal to or greater than 0.8 is highly trustworthy, or greater than or equal to 0.7 is reasonable (Koo et al,), and greater than or equal to 0.6 reveals poor reliability (Xie et al, 2023). The constructs' dependability results are included in Table 2.…”

Section: Pilot Studymentioning

confidence: 99%

The Collaborative Effort and Efficiency of Inquiry-Based Learning

Miraz

Saleheen

Ashif

et al. 2023

International Journal of Online Pedagogy and Course Design

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This study investigates the effect on the teacher's performance of collaborative effort and efficiency of inquiry-based learning. It also determines the impact of the mediating role of student performance. The research framework was constructed based on the unified technology acceptance and use of technology theory. A quantitative analysis was done with surveys to collect primary data from the teacher and lecturers of Malaysia. The researcher used a Likert scale of 7 to evaluate elements of the building. This study focuses on the top 10 public university students in Malaysia. The universities are University Malaya (UM), University Kembangan Malaysia, University Putra Malaysia (UPM), University Since Malaysia (USM), University Technology Malaysia (UTM), Universiti Utara Malaysia (UUM), International Islamic University Malaysia (IIUM), University Technology Mara (UiTM), University Malaysia Perlis (UniMap), and University Tun Hossain (UTHM). Finally, researchers selected the total number of students, 368,881, which is the population of this study. Using systematic random sampling with an interval, researchers sent students an electronic link to respond to a Google Doc questionnaire. This is a unique study in the field of teacher performance that used a diverse and necessary variable known as teaching pedagogy. Therefore, it uniquely integrates leading pedagogy variables into teacher performance. The result of this study helps to meet the education qualification requirement (EQR), and the newly acquired knowledge from this study may help spur the development of the education sector. In addition, it may provide an extensive understanding of making government policies for educational institutions.

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Evaluation of equivalent crack propagation length and fracture energy of two commonly used rock fracture toughness test configurations based on Bažant’s size effect law

Cited by 16 publications

References 56 publications

Enhancing Water Management in Shale Gas Extraction through Rectangular Pulse Hydraulic Fracturing

Enhancing Water Management in Shale Gas Extraction through Rectangular Pulse Hydraulic Fracturing

Assessing the intention to accept inquiry-based teaching pedagogy among Chinese university students: an extension of technology acceptance model

The Collaborative Effort and Efficiency of Inquiry-Based Learning

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