【摘要】 高寒、高海拔地区岩体物理风化导致的不良地质对工程建设影响明显。为了揭示高寒山区岩体在冻融条件下破坏的机理,使岩体冻融破坏防治更有针对性及有效,依托乌鲁木齐-尉犁高速公路建设项目,通过试验手段,探讨了冻胀条件下岩体破坏的原因。冰劈试验揭示了自由水变成冰过程中膨胀力的变化情况及特性,试验显示在围护环境不变的情况下冻胀力或冰劈力可以达33 MPa以上,远大于岩石抗拉强度及裂隙胶结强度,且温度越低,冻胀启动越快,速率越大,冰劈越明显。通过岩体冻胀应变试验揭示了岩体裂隙中自由水膨胀变形性质。岩体冻胀应变主要由裂隙变化引起,裂隙性质不同,冻胀应变特征不同,冻胀应变的趋势及大小受控于裂隙的贯通性、含水情况及胶结强度。由此,总结了岩体在冻胀条件下的破坏机理。该成果对高寒山区岩体的破坏机理的认识具有重要的理论和现实意义。更多还原

【Abstract】 In the cold and high altitude regions,freeze-thaw damage start from the rock fractures.Relying on the Urumqi- Yuli higyway of China construction feasibility study and research projects,through the experimental study,this paper discusses the reason of fracture failure of freezing and thawing conditions.About the factors of stess,We through the ice split test revealed the process of expansion stress caused by the change of water into ice,Results show that the ice split force which can reach 33 MPa or more is much larger than the bond strength of rock fracture.About the factors of strain,We through the rock frost heaving strain tests reveal the fracture rock mass properties of frost heave,results show that rock mass strain is mainly caused by the change of the frost rock fracture.Thus,we summarize the failure mechanism of rock under frost conditions.The results have important theoretical and practical significance for understanding the failure mechanism of rock mass under freezing and thawing.更多还原