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   

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   

钻孔灌注桩的施工质量控制     

廖远淦 《南方国土资源》1999,12(3):67-70

该文通过对钻孔灌注桩的主要施工工艺如：泥浆比重及粘稠度、孔内沉渣厚度、钢筋笼的制安以及水下混凝土的灌注等工艺技术要求的控制方法的阐述，指出在钻孔灌注桩施工过程中只要对这些工序加强控制，就能确保钻孔灌注桩的质量  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   

Additives for Slurry Shields in Highly Permeable Ground   总被引：2，自引：0，他引：2  

P. Fritz 《Rock Mechanics and Rock Engineering》2007,40(1):81-95

Summary. For tunneling projects in saturated soils tunnel boring machines (TBMs) with slurry shields are widely used. However, in coarse, highly permeable soils the suspension penetrates the ground and the required support pressure cannot be built up. For the Zimmerberg Base Tunnel near Zurich permeabilities much greater than 10⁻³ m/s were expected. This value is usually considered as the critical limit for the applicability of slurry shields. Therefore it was aimed to find additives for the bentonite suspension which would allow it to attain a higher suspension pressure. For these investigations an apparatus has been developed. It allows the maximum attainable support pressure for a given suspension and a ground to be determined. It reflects the real situation, produces reproducible results and is insensitive to the inevitable variation of individual parameters. In the tests the additives polymer, sand and vermiculite were studied and their effects on the attainable maximum suspension pressure investigated. For the best combination, i.e. with a well defined proportion of the individual components, suspension pressures could be attained which were about 10 to 20 times higher than those with an ordinary bentonite suspension. Successful excavation of the Zimmerberg Base Tunnel proved the validity of the laboratory tests containing 200 kg bentonite per m³ water.  相似文献   

地方病高发区成井用胶质水泥浆的试验研究          下载免费PDF全文

冉德发叶成明  王建增郑继天 汪敏 《探矿工程》2007,34(3):1-4

通过地方病高发区成井用胶质水泥浆的试验研究，以普通水泥和膨润土为基本材料，同时添加改善材料性能的外加剂，研制了一种用于高砷、高氟、高矿化度地区水井成井的止水材料，具有流动性好、抗渗性高、不收缩、完全无毒、价格低廉等特点，特别是其高抗渗性和不收缩性非常适合地方病区成井时隔离劣质含水层，保证优质含水层与劣质含水层互不串通、不渗漏、不污染。  相似文献