Stratigraphy and depositional setting of slurry and contained (reflected) beds in the Marnoso‐arenacea Formation (Langhian‐Serravallian) Northern Apennines,Italy     

PIERRE MUZZI MAGALHAES  ROBERTO TINTERRI 《Sedimentology》2010,57(7):1685-1720

This work presents the stratigraphy and facies analysis of an interval of about 2500 m in the Langhian and Serravallian stratigraphic succession of the foredeep turbidites of the Marnoso‐arenacea Formation. A high‐resolution stratigraphic analysis was performed by measuring seven stratigraphic logs between the Sillaro and Marecchia lines (60 km apart) for a total thickness of about 6700 m. The data suggest that the stratigraphy and depositional setting of the studied interval was influenced by syndepositional structural deformations. The studied stratigraphic succession has been subdivided into five informal stratigraphic units on the basis of how structurally controlled topographic highs and depocentres, a consequence of thrust propagation, change over time. These physiographic changes of the foredeep basin have also been reconstructed through the progressive appearance and disappearance of thrust‐related mass‐transport complexes and of five bed types interpreted as being related to structurally controlled basin morphology. Apart from Bouma‐like Type‐4 beds, Type‐1 tripartite beds, characterized by an internal slurry unit, tend to increase especially in structurally controlled stratigraphic units where intrabasinal topographic highs and depocentres with slope changes favour both mud erosion and decelerations. Type‐2 beds, with an internal slump‐type chaotic unit, characterize the basal boundary of structurally controlled stratigraphic units and are interpreted as indicating tectonic uplift. Type‐3 beds are contained‐reflected beds that indicate different degrees of basin confinement, while Type‐5 are thin and fine‐grained beds deposited by dilute reflected turbulent flows able to rise up the topographic highs. The vertical and lateral distribution of these beds has been used to understand the synsedimentary structural control of the studied stratigraphic succession, represented in the Marnoso‐arenacea Formation by subtle topographic highs and depocentres created by thrust‐propagation folds and emplacements of large mass‐transport complexes.  相似文献   

注浆护壁堵漏工艺在深孔岩心钻探中的应用          下载免费PDF全文

张成德 《探矿工程》2010,37(5):25-26

简述了深孔岩心钻探破碎岩层护壁堵漏的重要性,注浆参数选择,水泥浆配比、速凝剂掺量的掌握,注浆施工中需把握的几个技术环节及注意事项,注浆施工经验总结及注浆效果评价等。  相似文献   

射流式水泥浆液制造器的研究     

王秋玲 《中国煤炭地质》2010,(5):74-76

在分析人工造浆阶段和风动造浆阶段原理及优缺点的基础上,开发研制出射流式水泥液制造器。通过对该设备主要构成部分结构的介绍,说明了其工作原理和使用方法。焦煤集团九里山矿14101工作面和古汉山矿11092(西)工作面的堵水实践证明,该设备的堵水率为100%,不仅可以提高注浆的速度及质量,降低劳动强度,改善注浆工地环境条件,而且具有价格便宜、设备安装简便、操作简单、容易维护,不受场地、注浆量大小、注浆点远近的限制等优点。  相似文献   

Can the diffuse double layer theory describe changes in hydraulic conductivity of compacted clays?   总被引：1，自引：0，他引：1  

Robrecht M. Schmitz 《Geotechnical and Geological Engineering》2006,24(6):1835-1844

Observations related to modifications of the hydraulic conductivity of compacted soils as a consequence of intentional compositional variation of the percolating fluid are often attributed vaguely to calculated changes in double layer thickness. The same calculated decrease or increase in double layer thickness is interpreted differently, depending on which (unconsciously held) boundary conditions authors take into account. The interpretations of different authors seem to be paradoxical only if the boundary conditions have not been mentioned. On the basis of a literature survey and own previously published test results the different boundary conditions have been grouped and divided into classes. With this division the interpretation of changes in double layer thickness will lead to unique interpretations and predictions of changes in hydraulic conductivity.  相似文献   

软土含砾地层斜孔成孔方法探讨     

卢文阁  池景军 《水文地质工程地质》1997,24(4):58-59

在锚固工程成孔中，软土含砾地层成孔困难，钻进效率低，效率效益差，针对这种情况分析了地层特点和采用不同成孔方法施工存在的问题，找出了一种比较适应的钻进成孔方法，并通过生产实践证明效果较佳，为软土含砾地层倾斜孔成孔提供了一种新方法。  相似文献   

泡沫泥饼形成机理          下载免费PDF全文

吴飞 《探矿工程》1997,(4):43-45

分析了泡沫泥饼的形成过程，其形成机理在于３个方面，即粘土颗粒间吸力和斥力的相对大小变化、聚合物吸附层对颗粒间作用力的影响以及气泡在井壁表面形成了三相润湿周边。  相似文献   

旋挖钻机与双聚合泥浆在桩基施工中的应用          下载免费PDF全文

朱艳峰  任凤鸣王红 袁兵 《地质与勘探》2003,39(4):92-94

介绍了旋挖钻机和双聚合泥浆在工程中的应用，通过工程实例介绍了旋挖钻机的施工方法，着重介绍了双聚合泥浆的制备、特点和技术要求。  相似文献   

Characterizing the rheology of laterite slurries     

Brian C. Blakey  David F. James   《International Journal of Mineral Processing》2003,70(1-4):23-39

The viscous behaviour of laterite slurries was characterized by measurements of shear stress at constant and changing shear rates. Steady state stresses were obtained after accounting for the settling solids: the values show that the fluids possess viscosities of order 100 mPa s and are moderately shear-thinning, for solid volume fractions from 0.06 to 0.18 and for shear rates between 10 and 1000 s⁻¹. Transient stress measurements were made for steps down in shear rate and for ramps down and up in shear rate. It was found that the Bingham–Maxwell model provides good fits to the transient data, both at low concentrations, where yield behaviour is dominant, and at high concentrations, where elasticity is dominant. For volume fractions of 0.10 or greater, relaxation times were found from step tests to be of order 10 s, but relaxation times found from the ramp tests were generally several times higher.  相似文献   

悬浮液进样—石墨炉原子吸收光谱法测定琥珀中微量铅   总被引：3，自引：0，他引：3       下载免费PDF全文

陈世忠 《岩矿测试》2003,22(3):228-230

报道了以NH4H2PO4为基体改进剂，采用悬浮体制样石墨炉原子吸收光谱法直接测定琥珀中微量铅的方法。试验了影响测定的主要因素。在优化实验条件下。方法的检出限为0．038μg／g，Pb的质量浓度为0～80μg／L时，工作曲线线性关系良好。对于ω(Pb)=5．71μg／g样品的测定，相对标准偏差(RSD，n=5)为6．83％。  相似文献   

岩溶地区冲孔灌注桩的施工方法     

吴辰光 《中国煤田地质》2007,19(A01):63-64,73

以龙岩地区岩溶地带某一项目施工为例，分析冲孔灌注桩孔内漏浆、塌孔的原因，探讨在岩溶地区预防和处理塌孔的方法：改善泥浆品质，安放钢护筒，挤压黄土入裂隙，减小泥浆渗透，以及分层加入一定量水泥，使其形成水泥土护壁层。实践证明，诸类方法的使用可有效遏制孔内漏浆和塌孔，提高施工效率。  相似文献