摘要
利用MTS815 Flex Test GT岩石力学试验系统,经过岩体受力状态模拟、无水压岩体力学特性测试、水岩耦合试验等几个阶段试验,对砂板岩岩体力学特性的高空隙水压效应进行了试验研究。结果表明:砂板岩岩体强度与变形性能随水压升高而降低,其中水压对黏聚力c的影响最大,对内摩擦角φ的影响甚微,对变形模量的影响居于二者之间。随着水压升高,岩体的黏聚力c急剧下降,当水压较高时,岩体可能完全丧失黏聚力;随着水压升高,变形模量E50和E0均有降低,两个参数的变化梯度相差不大。这些成果揭示了砂板岩岩体力学特性的高空隙水压力效应,并建立了主要力学参数预测模型,成果对于解决工程实际问题具有重要的参考价值。
Using rock mechanics test system with MTS815 Flex Test GT, the high pore water pressure effects of mechanical properties of the sandy slate rock mass are studied through several stages of tests, such as simulation of the stress state of rock mass, mechanical properties tests of rock mass without water pressure and coupling tests of water-rock. The results and analysis show that the strength and deformation properties of the sandy slate rock mass decrease with the increase of the water pressure. The water pressure has the greatest impact on cohesion c, the least impact on angle of internal friction φ, and a moderate impact on deformation modulus. The cohesion creduces sharply with the rising water pressure. When the water pressure gets to a high level, rock mass completely loses cohesion. Both the deformation moduli E50 and E0 decrease with the rising water pressure, and their variation gradients have little diffience. These conclusions reveal the effect of pore water pressure on the mechanical properties of the sandy slate rock mass, and a prediction model for the main mechanical parameters is established. This study is valuable to solve practical engineering problems.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第3期599-604,共6页
Chinese Journal of Geotechnical Engineering
关键词
砂板岩
岩体力学特性
高空隙水压力
水岩耦合试验
sandy slate
mechanical property of rock mass
high pore water pressure
water-rock coupling test
