高应力下土与结构接触面抗剪强度研究是当前井壁破裂理论研究的关键之一。
The shear strength between soil and structure interfaces in high stress is one of key research in shaft lining fracture theory.
气体压力分布影响裂缝尖端应力强度，因而不能用传统的破裂压力来判断裂缝起裂扩展。
Since the pressure gradient affects stress strength of crack top, it is unsuitable to judge crack initiation by the traditional breakdown pressure.
给出了灰砂岩、石灰岩两种岩石动态的破裂强度与应力应变关系。
The dynamic strength and dynamic stress-strain curves for sandstone and limestone are given.
井壁的破裂压力不仅取决于地应力，还与井眼形态和地层的强度各向异性有关。
The fracturing pressure is dependent on in-situ stress, well deviation and the anisotropy of tensile strength.
分析认为，孕震应力场的应力强度对孕震区内地震的破裂方向有明显的约束作用。
This suggests that focal stress intensity has restraining effect on earthquake's rupture direction.
试验结果表明：轴向应力低于单轴压缩强度80%时孔道试样在内压下拉伸破裂，压力与轴向应力没有明显关系；
The experimental results show that the cracking pressure for hollow cylinder is not influenced by the axial load when it is lower than 80% of the uniaxial compression strength.
试验结果表明：轴向应力低于单轴压缩强度80%时孔道试样在内压下拉伸破裂，压力与轴向应力没有明显关系；
The experimental results show that the cracking pressure for hollow cylinder is not influenced by the axial load when it is lower than 80% of the uniaxial compression strength.
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