The Tarfala Mass Balance Programme     

Per Holmlund  & Peter Jansson 《Geografiska Annaler: Series A, Physical Geography》1999,81(4):621-631

The Tarfala mass balance programme currently comprises seven glaciers distributed in two, one southerly and one northerly, east-west trending profiles. Of the studied glaciers, Storglaciären has the longest record spanning 1945 to present. The purpose of the programme is to study gradients in mass balance parameters across the northern Scandinavian mountains. The measurements of both winter and summer balance are carried out with significant redundancy each year. In order to maintain such a large programme with limited personnel, different measurement techniques and strategies are applied to the different glaciers according to a priority scale. Storglaciären is the most important glacier in the network and is measured with high accuracy and measurement density. Storglaciren is also used as a reference for all other glaciers in the programme. The other glaciers have sparser measurement systems and are sometimes measured using alternative methods such as snow radar. In general, Swedish glaciers are still responding to the major climatic warming around 1910–1920 by retreat, and the effect of very long response times. However, measured volume change indicates that most glaciers are close to or varying around a quasi-steady state.  相似文献   

Inferring the lithology of borehole rocks by applying neural network classifiers to downhole logs: an example from the Ocean Drilling Program   总被引：3，自引：0，他引：3  

D. Benaouda  G. Wadge  R. B. Whitmarsh  R. G. Rothwell  & C. MacLeod 《Geophysical Journal International》1999,136(2):477-491

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钦州中山码头水下礁石爆破     

谢炳龙  刘长坚  朱彬 《南方国土资源》2000,13(1)

文章介绍钦州中山码头港池疏浚工程水下炸礁爆破设计及施工情况 ,着重论述了在特定复杂环境下 ,水下炸礁安全爆破方案选择 ,钻爆参数确定 ,起爆网路等设计以及试验爆破测试 ,进而对爆破效果进行总结和评价。  相似文献   

复杂条件下城市地下管线探测技术的应用   总被引：4，自引：0，他引：4  

杜良法  李先军 《地质与勘探》2007,43(3):116-120

在城市地下管线探测中,最常用的物探方法是电磁法和电磁波法(探地雷达).通过对这两种方法的原理、管线异常特征的介绍,提出了在复杂条件下物探方法技术的应用,目的是减少干扰因素的影响、突出目标管线异常,最终对目标管线进行精确定位定深.  相似文献   

泥浆对钻头WC基胎体材料冲蚀磨损的试验研究   总被引：2，自引：0，他引：2  

江新洪  段隆臣  刘志义 《煤田地质与勘探》2007,35(4):77-80

采用双喷嘴闭路循环试验装置,测试了钻头胎体材料在泥浆冲蚀作用下所产生的总质量损失TML和由纯机械冲刷作用所产生的质量损失E。通过计算得到了由腐蚀及机械冲刷与腐蚀相互作用所产生的质量损失C+S。结果表明,钻头胎体材料的冲蚀磨损不是纯由机械冲刷作用引起,而是由机械冲刷、腐蚀及他们的相互作用共同引起。因此,在有腐蚀性的泥浆中设计和选用PDC (金刚石复合片)钻头时,除了考虑胎体材料的抗冲刷磨损性能外,还应考虑钻头胎体材料的抗腐蚀性。   相似文献   

基于GIS的武汉市长江新城地下空间资源质量评估     

熊峰  江丹  吴品磊  庞设典  官善友 《地质与资源》2022,31(2):228-234

地下空间开发是当下城市建设的热点.为服务于长江新城地下空间规划建设,在多要素城市地质调查所获取的大量基础数据和成果资料的基础上,结合GIS技术,开展长江新城地下空间资源质量评价,得到长江新城不同深度的地下空间资源质量分区图.结果表明：浅层、次浅层地下空间资源质量总体为良—优,且西南侧明显不如东侧和北侧,主要受现有地下构筑物、软土及地下水等因素的影响;次深层、深层地下空间资源质量总体为中—良,主要受开发深度、岩溶及岩体开挖难度的影响.  相似文献   

Analysis of the behavior of large underground oil storage caverns in salt rock          下载免费PDF全文

A. Mortazavi  H. Nasab 《国际地质力学数值与分析法杂志》2017,41(4):602-624

The storage of petroleum products above ground surface has many constraints and limitations. A viable alternative is to excavate large underground spaces in rock to provide a safer way for oil storage. Soft rock formations such as salt domes provide suitable conditions from environmental and operational aspects. The potential for high volume storage and low permeability are among advantages of oil storage in caverns excavated in salt rocks. The complicated shape of oil storage caverns, complex behavior of salt rock, and boundary conditions associated with large underground openings are major challenges in the design of salt caverns excavated for oil storage purposes. In this study, the deformation mechanism and stability of salt caverns were investigated. A comprehensive 3D numerical study was carried out to investigate the effects of cavern size and depth, salt rock deformation modulus, and ground in‐situ stress regime on the behavior of large salt caverns. The stress field and deformation mechanisms were studied numerically aiming at shedding lights into the design aspects of salt caverns for oil storage. The analysis results show that the cavern safety factor is reduced as a function of cavern depth and storage volume. Also, with decrease in k (ratio of horizontal to vertical in‐situ stress), the stability of salt caverns will increase; however, with increase in salt rock young modulus, the sensitivity of cavern stability to k ratio is reduced. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Residual stress features in drill cores     

A. Zang  H. Berckhemer 《Geophysical Journal International》1989,99(3):621-626

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郑州市地热水资源及地热深井施工实践     

王宝玉 《河南国土资源》1997,(1)

本文简要介绍了郑州市地热水资源之概况，对施工工艺中的成井条件、钻孔质量、冲孔换浆、止水等进行了较为详尽的论述。对郑州市地热水资源开发前景作出初步估计，同时对保护地热水资源提出切实可行的建议，呼吁全社会重视水资源的保护  相似文献   

Site response study in Abruzzo (Central Italy): underground array versus surface stations   总被引：1，自引：1，他引：0  

G. De Luca  E. Del Pezzo  F. Di Luccio  L. Margheriti  G. Milana  R. Scarpa 《Journal of Seismology》1998,2(3):223-236

In this site response study we examined local earthquakes recorded at surface stations of a local seismic network and at a temporary underground seismic array installed in a tunnel underneath the Gran Sasso Massif in Abruzzo (central Italy). This allowed us to compare the seismic site response beneath the mountain and on the surface in similar geological environment (soft rock sites). We applied spectral ratios method on different segments of the seismograms and used different reference spectra in the 1–20 Hz frequency band. We found little or no amplification effects at most of the surface stations whereas site transfer functions evaluated with respect to underground sites show an amplification factor up to 6 in the 1–8 Hz frequency range. Coda spectral ratios estimated at soft rock sites are confirmed as good estimates of shear wave transfer function.  相似文献