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1·The average fracture propagation velocity is estimated with a series of crack gauges glued on the specimen.

裂纹传播平均速度由黏接在试样上的一系列裂缝计测量得到。

2·During the refracturing process, monitoring fracture propagation is important to ensure the success of the job.

在重复压裂过程中，裂缝扩展动态监测是保障作业能否成功的关键。

3·Numerical Simulation of the multiple radial fracture propagation during the high energy gas fracturing is significant in the study of mechanism.

数值模拟是高能气体压裂径向多裂缝延伸机理研究的重要内容。

4·During fracture propagation driven by detonation gas in oil well, dynamic response of crack surface under the gas pressure results in fast fracturing.

油井爆生气体对岩石劈裂作用过程，是裂缝面对动态荷载响应并使其发生动态扩展的过程。

5·The mechanical nature of 121 earthquake faults, the strikes of 40 events and the directions of fracture propagation of 15 events are discussed in this paper.

本文研究了华北121个地震断层的错动方式，40个地震断层的走向，15个地震断层的破裂方式与扩展方向。

6·The models and computation procedures for determining fracture propagation path were provided, and the software for simulation of fracture propagation was developed.

提出了定向射孔水力压裂裂缝的延伸轨迹计算模型和步骤，编制了裂缝延伸的模拟软件。

7·The results show that hydraulic fracture propagation is not only related to the orientation of borehole in the stress field, but the magnitude of principal stresses.

通过研究发现，水力裂缝方位不但与井筒在现场地应力场中的方位有关，而且主应力的大小也会影响到裂缝的延伸情况。

8·In the paper, on the basis of two rupture modes-fracture propagation and shearing slide, the strength of jointed rock is derived by use of statistical fracture mechanics.

本文基于岩体节理断裂扩展和剪切滑移两种失稳破坏机制，运用统计断裂力学方法建立了两种破坏方式下节理岩体强度的理论表达式。

9·A new idea that the distribution movement of electric charge in the crack tip end being associated with rock fracture propagation produces electromagnetic emission was brought up.

本文提出了岩石破裂时的电磁辐射是裂纹尖端电荷随着裂纹加速扩展运动所产生的假说。

10·A new idea that the distribution movement of electric charge in the cr ack tip end being associated with concrete fracture propagation produce electromagnetic emission is brought up.

对混凝土断裂时的电磁发射现象进行了理论研究，研究表明：混凝土断裂电磁发射是由于裂纹尖端电荷随着裂纹的加速扩展运动而产生。