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节理裂隙普遍存在于各种天然岩体中,其力学特性和透水能力直接关系到岩体工程质量及工程应用安全.针对按一定角度预置了不同尺寸裂隙的试样,用剪切试验和渗流试验的方法研究了其在剪切作用下的力学性质及不同剪切加载级数下含预置裂隙试样的透水能力.研究结果表明:(1)裂隙尖端的起裂角与初裂强度变化规律符合Lajtai提出的岩桥破坏理论;(2)自主研制的用于含裂隙试样透水能力测试的试验装置,原理简单、制作方便、操作容易、数据可靠,能有效地用于含节理试样的透水能力测试;(3)试验数据表明,含裂隙试样的透水能力与加载级数呈先下降后上升的非线性关系,并导出了透水系数(Kf)和加载级数(σ/σini)之间的函数关系方程.
Joints and fissures are common in all kinds of natural rock masses, and their mechanical properties and water permeability are directly related to the quality of rock mass engineering and engineering application safety.For the specimens with different sizes of fractures preset at an angle, shear tests and seepage The mechanical properties under shear and the water permeability of prefilled fractured samples under different shear loading series were studied.The results show that: (1) the crack initiation angle and the initial rupture strength The law accords with the rock bridge failure theory proposed by Lajtai. (2) The self-developed test device for testing the water permeability of fractured samples has the advantages of simple principle, easy manufacture, easy operation and reliable data. (3) The test data show that the permeability and loading series of fractured samples first decrease and then increase nonlinearly, and the permeability coefficient (Kf) and loading series (σ / σini) The functional relationship between the equations.