利用格利菲思强度准则和断裂力学原理求得了混凝土类脆性材料裂缝端部微裂缝区的边界方程。
A boundary 's equation of microcrack region near crack tip of such brittle materials as concrete has been obtained according to the Griffith' s criterion and fracture mechanics.
该准则的特点是：形式简单，不仅能正确反映混凝土单轴应力状态下的强度，而且能很好地反映多轴应力状态下混凝土的强度。
With a simple form, the criterion can reflect the concrete strength precisely not only under uniaxial stresses but also under multiaxial stresses.
虽然三轴试验较多，但是主要是针对三轴情况下混凝土的强度(破坏准则)，没有具体针对不同围压应力比下的应力—应变关系做出研究。
Although there are many experiments under multiaxial stress states, most of the results mainly concern to the strength and failure criterion of concrete.
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