Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method
When inducing cracks, soundless cracking agents (SCAs) do not generate vibration, harmful gas, dust, nor flying rock fragment, making them suitable for hard rock roof breaking, rock burst prevention, oil or gas reservoir stimulation, and building demolition. In this study, SCA-induced crack initiati...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/7936043 |
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| author | Shen Wang Hani Mitri Huamin Li Dongyin Li Wen Wang |
| author_facet | Shen Wang Hani Mitri Huamin Li Dongyin Li Wen Wang |
| author_sort | Shen Wang |
| collection | DOAJ |
| description | When inducing cracks, soundless cracking agents (SCAs) do not generate vibration, harmful gas, dust, nor flying rock fragment, making them suitable for hard rock roof breaking, rock burst prevention, oil or gas reservoir stimulation, and building demolition. In this study, SCA-induced crack initiation and propagation in different stress conditions were modelled using a modified cohesive element method. A new traction-separation law for describing rock compressive shear strength was proposed. The crack length and direction in bidirectional isobaric and unequal stress fields were analyzed in detail. The crack initiation pressure and the incremental ratio of crack length to SCA expansion pressure were proposed as two indicators to evaluate the difficulty in rock breaking in deep underground. Results indicate that (1) the modified cohesive element method used in this study is feasible to model crack propagation in deep rocks; (2) the maximum expansion pressure of SCAs depends on rock elastic modulus and geostress field and should be measured under a condition similar to deep underground prior to SCA borehole spacing design; when using the SCAs with a maximum expansion pressure of 100 MPa in 600 m underground, the suggested borehole spacing is less than 220 mm; and (3) σ3 dominates the crack initiation pressure while the principal stress ratio σ3/σ1 and notch direction control the direction of crack propagation. |
| format | Article |
| id | doaj-art-63da637a00c34fb08ec1c22ee05cd1e7 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-63da637a00c34fb08ec1c22ee05cd1e72025-02-03T01:02:41ZengWileyAdvances in Civil Engineering1687-80861687-80942018-01-01201810.1155/2018/79360437936043Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element MethodShen Wang0Hani Mitri1Huamin Li2Dongyin Li3Wen Wang4School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, ChinaDepartment of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 0E8, CanadaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, ChinaWhen inducing cracks, soundless cracking agents (SCAs) do not generate vibration, harmful gas, dust, nor flying rock fragment, making them suitable for hard rock roof breaking, rock burst prevention, oil or gas reservoir stimulation, and building demolition. In this study, SCA-induced crack initiation and propagation in different stress conditions were modelled using a modified cohesive element method. A new traction-separation law for describing rock compressive shear strength was proposed. The crack length and direction in bidirectional isobaric and unequal stress fields were analyzed in detail. The crack initiation pressure and the incremental ratio of crack length to SCA expansion pressure were proposed as two indicators to evaluate the difficulty in rock breaking in deep underground. Results indicate that (1) the modified cohesive element method used in this study is feasible to model crack propagation in deep rocks; (2) the maximum expansion pressure of SCAs depends on rock elastic modulus and geostress field and should be measured under a condition similar to deep underground prior to SCA borehole spacing design; when using the SCAs with a maximum expansion pressure of 100 MPa in 600 m underground, the suggested borehole spacing is less than 220 mm; and (3) σ3 dominates the crack initiation pressure while the principal stress ratio σ3/σ1 and notch direction control the direction of crack propagation.http://dx.doi.org/10.1155/2018/7936043 |
| spellingShingle | Shen Wang Hani Mitri Huamin Li Dongyin Li Wen Wang Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method Advances in Civil Engineering |
| title | Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method |
| title_full | Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method |
| title_fullStr | Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method |
| title_full_unstemmed | Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method |
| title_short | Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method |
| title_sort | study of sca induced rock crack propagation under different stress conditions using a modified cohesive element method |
| url | http://dx.doi.org/10.1155/2018/7936043 |
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