Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 52 9 2020 11 21 Effect of Confining Pressure on Mode I and Mode II Fracture Toughness of Lushan Sandstone Effect of Confining Pressure on Mode I and Mode II Fracture Toughness of Lushan Sandstone 2145 2154 3459 10.22060/ceej.2019.15944.6083 FA Navid Ghanbari Imam Khomeini international university Mehdi Hosseini Imam Khomeini international university Morteza Saghafiyazdi Imam Khomeini international university Journal Article 2019 03 09 Rock is a brittle naturally material that is subjected to a variety of environment impacts, such as temperature, confining pressure, humidity and water erosion. Moreover, the effect of confining pressure on rock fracture in most engineering fields has been considered. These include the stability analysis of rock to accumulate atomic waste in underground reservoirs, the hydraulic fracture process for extraction of oil and gas from different layers of the earth and analysis of the stability of underground mines. In this paper, Effect of confining pressure on Mode I and Mode II fracture toughness of Lushan sandstone were investigated. To investigate the effect of confining pressure on mode I and II fracture toughness, was used a Cracked Chevron Notched Brazilian Disc. In this study, the specimens were subjected to a confining pressure of 3, 5, 7and 10 MPa. In this experiments, specimens of Lushan sandstone is studied specimens. The results show that, with increasing confining pressure, mode I and II fracture toughness of sandstone increases linearly and nonlinearly respectively. Rock is a brittle naturally material that is subjected to a variety of environment impacts, such as temperature, confining pressure, humidity and water erosion. Moreover, the effect of confining pressure on rock fracture in most engineering fields has been considered. These include the stability analysis of rock to accumulate atomic waste in underground reservoirs, the hydraulic fracture process for extraction of oil and gas from different layers of the earth and analysis of the stability of underground mines. In this paper, Effect of confining pressure on Mode I and Mode II fracture toughness of Lushan sandstone were investigated. To investigate the effect of confining pressure on mode I and II fracture toughness, was used a Cracked Chevron Notched Brazilian Disc. In this study, the specimens were subjected to a confining pressure of 3, 5, 7and 10 MPa. In this experiments, specimens of Lushan sandstone is studied specimens. The results show that, with increasing confining pressure, mode I and II fracture toughness of sandstone increases linearly and nonlinearly respectively. https://ceej.aut.ac.ir/article_3459_13d63838ef1fb6f34ca2dc6821c60e49.pdf