空气潜孔锤钻进技术在乌蒙山地下水探采结合工程中的应用          下载免费PDF全文

张统得  严君凤  房勇  许蛟 《探矿工程》2016,43(10):238-241

乌蒙山地下水探采结合工程是将水文地质调查中的水文地质勘探与供水井施工相结合的一项国家重点扶贫项目,该项目50余口探采结合井的施工解决了超过5万人的生活饮用水问题,取得了良好的社会经济效益。空气潜孔锤钻进技术在该项目中发挥了重要作用。文章介绍了空气潜孔锤在水文水井钻探中的技术优势,重点阐述了该项技术的施工工艺、设备选型以及典型复杂情况的处理,并提出了该项技术在水文水井施工方面的下一步研究方向。  相似文献   

山西中村煤矿抢险救援快速钻井施工技术          下载免费PDF全文

徐培远  曹伟  王立峰  张晓昂 《探矿工程》2016,43(10):278-280

2016年7月2日,山西中村煤矿发生突水事故,12名矿工被困井下。采用CMD100型车载钻机、空气潜孔锤钻井技术准确钻孔至离地面114 m的巷道中心,快速建立了生命通道,给井下被困矿工送去急需的给养,为进一步抢险救援赢得了宝贵时间,最终8名被困矿工成功获救。本文介绍了该次矿山抢险救援中2号食物补给井的快速钻井施工技术,并对矿山应急救援钻井专业队伍建设和装备配套提出了建议。  相似文献   

SCHMIDT‐HAMMER EXPOSURE AGES FROM PERIGLACIAL PATTERNED GROUND (SORTED CIRCLES) IN JOTUNHEIMEN,NORWAY, AND THEIR INTERPRETATIVE PROBLEMS          下载免费PDF全文

STEFAN WINKLER  JOHN A. MATTHEWS  RICHARD W. MOURNE  PETER WILSON 《Geografiska Annaler: Series A, Physical Geography》2016,98(3):265-285

Periglacial patterned ground (sorted circles and polygons) along an altitudinal profile at Juvflya in central Jotunheimen, southern Norway, is investigated using Schmidt‐hammer exposure‐age dating (SHD). The patterned ground surfaces exhibit R‐value distributions with platycurtic modes, broad plateaus, narrow tails, and a negative skew. Sample sites located between 1500 and 1925 m a.s.l. indicate a distinct altitudinal gradient of increasing mean R‐values towards higher altitudes interpreted as a chronological function. An established regional SHD calibration curve for Jotunheimen yielded mean boulder exposure ages in the range 6910 ± 510 to 8240 ± 495 years ago. These SHD ages are indicative of the timing of patterned ground formation, representing minimum ages for active boulder upfreezing and maximum ages for the stabilization of boulders in the encircling gutters. Despite uncertainties associated with the calibration curve and the age distribution of the boulders, the early‐Holocene age of the patterned ground surfaces, the apparent cessation of major activity during the Holocene Thermal Maximum (HTM) and continuing lack of late‐Holocene activity clarify existing understanding of the process dynamics and palaeoclimatic significance of large‐scale sorted patterned ground as an indicator of a permafrost environment. The interpretation of SHD ages from patterned ground surfaces remains challenging, however, owing to their diachronous nature, the potential for a complex history of formation, and the influence of local, non‐climatic factors.  相似文献   

Younger Dryas glaciers and climate in the Mourne Mountains,Northern Ireland     

《第四纪科学杂志》2017,32(1):104-115

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A solution around a backfilled cavity in a low‐permeability poroelastic medium with application in in situ heating tests          下载免费PDF全文

L. Yu  G.J. Chen  E. Weetjens 《国际地质力学数值与分析法杂志》2017,41(1):3-29

Thermo‐hydro‐mechanical responses around a cylindrical cavity drilled or excavated in a low‐permeability formation are studied when the cavity is subjected to a time‐dependent thermal loading. The cavity is considered backfilled after it is supported by casing or lining. Solutions of temperature, pore water pressure, stress, and displacement responses are analytically formulated based on Biot's consolidation theory with the assumption that the backfilling material, supporting material, and surrounding low‐permeability formation are poroelastic media. The solution is expressed in Laplace space, and numerical inversion techniques are used to find field variables in the real‐time domain. After the solution is verified with the numerical results, it is applied in a large‐scale in situ heating test – PRACLAY heating test – for a predictive reference calculation and an extensive parametric study. Another medium‐scale in situ heating test – ATLAS III heating test – is also analyzed using the solution, which provides reasonable agreement with measurements. The new analytical solution proves to be a convenient tool for a good understanding of the resulting coupled thermo‐hydro‐mechanical behavior and is therefore valuable for the interpretation of measured data in engineering practices and for a rational design of potential radioactive waste repositories. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

贵州岩溶疏干区浅层地热能地埋管施工技术          下载免费PDF全文

陈浩  赵华宣  贾玉川  曾远明  汤自华  王虎  李勇 《探矿工程》2021,48(3):170-177

贵州省浅层地热能资源丰富,开发潜力巨大,但碳酸盐岩地层分布广、浅表岩溶裂隙极为发育,浅层地埋管施工难度大。以贵州仁怀妇幼保健院浅层地温中央空调地埋管工程为例,采用偏心潜孔锤跟管钻进、潜孔锤钻进、简便除尘器除尘、固结封堵和圆木封隔溶洞、提吊法下管等技术措施,解决了在由于溶蚀和断裂构造及河流深切割作用造成的局部岩溶发育以及地埋管埋置深度内无水的岩溶疏干区进行地埋管施工面临的松散浅表回填及岩溶软弱层成孔困难、全孔段无液面潜孔锤钻进粉尘污染环境、溶洞跑管（PE管）等技术难题,在保证了工程质量、安全的同时提高了施工效率,为类似工程提供了施工经验。  相似文献   

射流式液动冲击器在ZK01-2井提速应用研究          下载免费PDF全文

郭强  翁炜  袁文真  张德龙  杨鹏  张杰丰  陈晓华 《探矿工程》2021,48(10):56-61

在深部地热开采中所钻遇的花岗岩地层,由于其硬度高、研磨性强、致密、可钻性差,致使钻进效率低、钻头消耗大、钻探周期长、成本高等。在“张家口地区地热资源调查评价”项目ZK01-2井施工中,为提高钻探效率,降低钻探周期与成本,采用了射流式液动冲击器配牙轮钻头的钻进方法,在硬岩地层中实现了高效破岩的应用效果。钻进过程中还对排量、钻压、转速等多种钻井工艺参数进行了优化分析,并进行了多次现场试验验证。应用结果表明,硬岩地层在进尺相同的条件下,采用射流式液动冲击器提速钻进比常规普钻效率提高了30%以上,大幅提高了硬岩地层的机械钻速,有效提升了钻探效率,起到了高效破岩的作用,为花岗岩等硬岩地层提速增效提供了重要的技术支撑。  相似文献   

潜孔锤-旋挖组合钻进技术在硬岩桩基工程中的应用          下载免费PDF全文

何正勇  李应平 《探矿工程》2021,48(12):114-119

旋挖钻进技术具有经济、快捷、环保等优点,在桩基工程中得到广泛应用,但常规旋挖钻机在钻凿硬岩（抗压强度>80 MPa）时,进尺非常缓慢。为解决采用旋挖钻进技术钻凿硬岩时进尺缓慢的问题,考虑到潜孔锤具有对硬脆性岩石施工速度快的优点,探索将潜孔锤与旋挖钻机组合使用。基于官井基地滑坡治理工程中抗滑桩的施工,对潜孔锤-旋挖组合钻进成孔技术进行介绍,对其碎岩成孔机理进行分析,验证了潜孔锤-旋挖组合钻进成孔技术的可行性,可为硬岩桩基工程的施工提供有益参考。  相似文献   

抽水试验在城市轨道交通工程勘察中的运用          下载免费PDF全文

李建红 《地质找矿论丛》2022,37(1):125-128

地下工程建设中不可避免地遇到地下水的控制问题,正确的水文地质参数是准确预测基坑涌水量进而进行地下水控制的前提.文章以郑州地铁5号线经开第八大街站的现场抽水试验为基础,通过1个抽水试验孔、2个观测孔进行了 3个不同水位降深的抽水试验,以更精确地确定含水层的水文地质参数,为深基坑地下水控制设计和施工提供重要的基础数据,对类...  相似文献   

水压式凿岩破碎冲击器的研究          下载免费PDF全文

杨红东  郑传峰  计胜利  侯传斌 《探矿工程》2010,37(10):74-77

水压式凿岩破碎冲击器与液动冲击器的工作机理有着本质的区别,它有着很高的工作效率和能量转换率,凿岩速度大大高于气动潜孔锤,但这种水压冲击器不适合泥浆驱动。转阀式水压冲击器的配流不同于以往的配流方式,可能更适合泥浆介质驱动。  相似文献