注意：矮小定位孔预钻孔的位置和便于大会。
NOTE: The undersized locator holes are pre - drilled for easy location and assembly.
通过设置静力释放孔、预钻孔取土减小压桩挤土效应。
Earth extrusion effect is alleviated by setting static force release perforations and pre-bored perforations during pile pressing.
桩位处预钻孔是工程中减弱沉桩挤土效应的有效措施之一。
Prebored hole is an effective construction measure of reducing compacting effects of jacked piles.
论文同时对挖防挤土槽、预钻孔等措施作了具体分析和评价。
Meanwhile, it's presented in the paper that measures such as digging the groovy and pre-bording are analyzed and evaluated.
消突效果检验后进行煤巷掘进，掘进期间通过对突出危险性指标和瓦斯涌出参数的分析，验证穿层钻孔区域预抽瓦斯消突技术的有效性；
The outburst risk index and gas gush feature are analysed during roadway progress. The result proves that the effectiveness of zonal gas pre-drainage by cross-measure boreholes.
为了有效解决这一难题，提高钻孔质量和探矿效果，组织进行了技术攻关，采取以预飘为主的措施，取得较好成效。
In order to effectively resolve this problem and improve the drilling quality and exploration results, a technical breakthrough is made, where pre-floating measures are adopted with better results.
本文运用水压致裂地应力测量方法，对我国某地下油库预可行性研究工程场区两个钻孔进行了地应力测量。
Hydrofracturing in situ stress measurements were used to determine in situ stress states of two drill holes for the pre-feasibility study of an underground reservoir at an engineering site in China.
现场试验表明，这是一种适于井下工作面钻进瓦斯预抽放短钻孔的轻便高效钻机。
The field test indicated that the developed drilling rig is appropriate for underground pre-drainage of coal seams.
光面爆破和预裂爆破技术已广泛地在路堑石方中应用，研究钻孔技术，尽量减少钻孔误差，是保证光面和预裂爆破的关键，在峒室加预裂一次爆破成型中尤为重要。
To study the drilling technique for decreasing the errors of ihe drilled hols as possible is to be ensured of the quality to use them.
残余瓦斯压力和预抽率的检验以及煤巷掘进期间的区域验证，均证明按该方法布置的预抽钻孔，消突效果有效。
The measurement method is demonstrated valid in outburst elimination by the examination of remnant gas pressure, pre-drainage rate and the zonal verification during the coal roadway driving.
残余瓦斯压力和预抽率的检验以及煤巷掘进期间的区域验证，均证明按该方法布置的预抽钻孔，消突效果有效。
The measurement method is demonstrated valid in outburst elimination by the examination of remnant gas pressure, pre-drainage rate and the zonal verification during the coal roadway driving.
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