| 大直径嵌岩斜桩冲击钻头冲击齿破岩数值模拟研究 |
| 投稿时间：2020-10-21 修订日期：2020-12-29 点此下载全文 |
| 引用本文：胡培强,王志明,周伏萍,等.大直径嵌岩斜桩冲击钻头冲击齿破岩数值模拟研究[J].钻探工程,2021,48(4):116-122.HU Peiqiang,WANG Zhiming,ZHOU Fuping,et al. Numerical simulation of rock breaking efficient caused by the teeth of impact bit during the large diameter rock socketed inclined piles drilling[J]. Drilling Engineering, 2021,48(4):116-122. |
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| 基金项目:国家自然科学基金项目“液动冲击回转作用下热压WC-Cu基孕镶金刚石钻头的磨损行为研究”（编号：41972327）；江西省地质工程（集团）公司地基与基础新技术集成研究项目“嵌岩斜桩冲击钻进成孔关键技术研究”（编号：2020056101） |
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| 中文摘要:大直径嵌岩斜桩的冲击成孔过程非常复杂，常规冲击钻头在钻进过程中存在效率低、磨损快、使用寿命低和成孔质量不高等问题，而钻头底部的冲击齿的类型和排布方式是解决这些问题的关键因素之一。基于此，本文采用数值模拟的方法，利用ANSYS LS-DYNA软件分析了三角棱柱齿、楔形齿和双锥形齿等3种冲击齿在不同冲程条件下冲击破坏不同抗拉强度砂岩的过程。研究结果表明，在岩石强度较低时，可以优先选择楔形齿，而受施工条件限制需要在低冲程条件下钻进较高强度岩石时，可优先采用三角棱柱齿。研究成果可为大直径嵌岩斜桩的冲击成孔施工选择钻头冲击齿提供一定的理论依据。 |
| 中文关键词:嵌岩桩 斜桩 冲击成孔 冲击齿 齿形 数值模拟 |
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| Numerical simulation of rock breaking efficient caused by the teeth of impact bit during the large diameter rock socketed inclined piles drilling |
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| Abstract:The percussive drilling of large diameter rock socketed inclined piles is very complicated. During the drilling process， common percussion bits have some shortages such as low hole forming efficiency， fast wear， short service life， and poor hole forming quality etc.， while the type of impact teeth on bits’ bottom， as well as its arrangement are key factors to solve the aforementioned problems. Based on this， the impact process of three kinds of impact teeth， i.e. triangular prism teeth， wedge teeth and double conical teeth were analyzed under different impact strokes and varied tensile strengths of sandstone. Results show that wedge-shaped teeth can be selected preferentially to drill soft formation， while triangular prism teeth should be selected if short impact strokes have to be used to drill relatively harder formations. The results in this study is meaningful to the teeth selection of impact bits in large diameter rock-socketed inclined piles construction by percussion drilling. |
| keywords:rock socketed pile inclined pile percussive drilling impact tooth tooth type numerical simulation |
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