Experimental study on fracture characteristics and strength loss of intermittent fractured quasi-sandstone under freezing and thawing#br#
LI Ping1，TANG Xuhai1，2，LIU Quansheng1，2，LUO Pandeng3#br#
(1. School of Civil Engineering and Architecture，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province，Wuhan University，Wuhan，Hubei 430072，China；3. Research Institute of Engineering Technology，Northwest Oilfield Branch，SINOPEC，Urumqi，Xinjiang 830011，China)
Abstract：The fractured rock mass in cold regions is often affected by the freezing and thawing action. In order to study the influence mechanism of the dip angle of rock bridge on frost heave expansion process，fracture failure characteristics and strength loss of fractured rock mass，double-fracture sandstone samples with different dip angles of rock bridge were prepared with similar materials，and freezing and thawing cycles with and without water injection and a series of uniaxial compression tests were performed. The results indicate that，driven by the frost heaving force，the frost heaving cracks continue to expand along with the growth of dendritic microcracks，and that the outer tip of the frost heaving crack mainly propagates along the initial crack direction while the inner tip tends to deflect towards the outer tip of another prefabricated crack. The greater the dip angle of the rock bridge，the more obvious the deflection effect will be. The uniaxial compression failure mode of the sample is easily affected by the frost heaving crack. When the inclination angle of the rock bridge，，is between 90° and 135°，shear failure occurs in the direction of the frost heaving crack，which leads to a significant decrease in the strength of the specimen. When =180°，the frost heaving crack is no longer the main cause of uniaxial compression failure of the specimen and has little effect on the strength loss and fracture characteristics.
李 平1，唐旭海1，2，刘泉声1，2，罗攀登3. 双裂隙类砂岩冻胀断裂特征与强度损失研究[J]. 岩石力学与工程学报, 2020, 39(1): 115-125.
LI Ping1，TANG Xuhai1，2，LIU Quansheng1，2，LUO Pandeng3. Experimental study on fracture characteristics and strength loss of intermittent fractured quasi-sandstone under freezing and thawing#br#. , 2020, 39(1): 115-125.
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2020, Vol. 39 
