The effect of earth pressure to rock breaking is studied. The principle of rock breaking mechanism by TBM is discussed and the action of rock breaking angle is emphasized.
通过地应力对破岩影响的分析，对TBM破岩机理进行了研究，着重考虑了岩石破裂角对破岩效果的影响。
The simulation results, which are suitable for studying the rock breaking mechanism of TBM in shallow-buried strata, have a good consistency with the experimental results and in-situ data.
仿真结果与实验室观测结果表明，研究成果和施工现场数据存有良好的一致性，可适用于浅地层TBM掘进机破岩机制的研究。
Aimed at the formation characteristics in Tahe area and rock breaking mechanism of PDC bits, the QP19L PDC bit fitting for this formation is optimized and the technical measures are summarized.
针对塔河地区的地层特点和PD C钻头的破岩机理，优选了适合于该地层钻进的QP 19 - L型PDC钻头，总结了PD C钻头的使用技术措施。
Through the analysing of mechanism of breaking rock in a hole explosion, the principle and design method of a crushing blasting is expounded.
通过对炮孔爆破的破岩机理分析，论述了挤压爆破的原理；
The rock-breaking mechanism of roller bit teeth is always a hot focus and difficulty in the fields of drilling, and it receives widely researchers attentions in the rock mechanics and the engineering.
牙轮钻头牙齿破岩机理研究一直是钻井工程的一个热点和难点，备受岩石力学与工程界的关注和重视。
To resolve the above problems we have designed a singular one-cone bit. We analyzed the bit to understand the mechanism, the result of breaking the rock, the characters of the fluid field.
针对以上问题设计了一种复锥面异形牙轮单牙轮钻头，为了研究设计的钻头结构是否合理、钻头的井底破岩效果、钻头的井底流场特性等问题，对试验钻头进行了一系列的分析。
According to the conservation principle of energy and the rock-breaking mechanism of bit, the assessment model was set up for formation lithology and the working condition of bit.
根据能量守衡原理和钻头破岩机理，建立了地层岩性与钻头工况评估模型。
According to the conservation principle of energy and the rock-breaking mechanism of bit, the assessment model was set up for formation lithology and the working condition of bit.
根据能量守衡原理和钻头破岩机理，建立了地层岩性与钻头工况评估模型。
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