泥水盾构泥浆泵选型关键参数规律性研究          下载免费PDF全文

孙恒  黄新淼  马超  陈少林  罗利平  张红伟 《探矿工程》2022,49(4):144-151

为了认清在泥水盾构泥浆泵选型设计时的规律性和差异性,针对现有研究的不足,采用统计分析法,从15个实际工程案例入手,统计了包括开挖直径、隧道长度、穿越主要地层、进排泥的管径、密度和流量在内的17个关键参数,分析在选型设计阶段关键参数之间的规律性和差异性,得到了进排泥的管径、密度与开挖直径的一次线性回归方程,不同地层的进排泥密度选取规律等6点结论,最后将结论成功运用于福州地铁F1线滨海新城站—机场站中间风井泥水盾构区间,研究成果可为今后泥浆泵选型或评估提供新的思路。  相似文献   

抗高温泡沫钻井液体系评价研究     

任小庆 《地质与勘探》2021,57(2):423-429

高温地热钻井过程中,温度会对泡沫钻井液体系稳定性造成影响。针对高温地热井泡沫钻井液的技术要点,分别对发泡剂、稳泡剂、抗温土的优选,在此基础之上分别对泡沫钻井液的抗高温性能、抗污染能力进行了评价。实验结果表明:(1)优选出的发泡剂/聚合物/粘土体系在不同温度下进行测试,均具有良好的泡沫稳定性和发泡能力,说明初步形成的泡沫体系具有良好的抗230℃高温的能力。(2)通过模拟欠平衡钻进过程中地热水对泡沫钻井液体系的污染发现,该体系耐一价盐能达到20%,而且在加入5%CaCl_2后析液半衰期仍在5 min以上,最终形成一套抗高温能力可达230℃,具有较好悬浮携带能力的地热井抗高温环保钻井液体系。  相似文献   

基于紧密堆积理论的低密度固井水泥浆设计   总被引：1，自引：1，他引：0       下载免费PDF全文

郑少军  王凯伦  刘思雨  刘天乐  蒋国盛  白世卿 《探矿工程》2021,48(3):94-100

合理的颗粒级配是提高固井水泥环内部密实度、早期力学强度和界面胶结能力的关键。基于此,本文从几种典型的连续颗粒级配的紧密堆积理论中优选出DFE进行固井水泥浆体系设计,并通过大量实验首次确定了适宜G级油井水泥基深水固井水泥浆体系设计的n值最优范围：0.33~0.40。结合激光粒度分析仪实测结果,在粒径≤3.38 μm、3.38~70.70 μm、≥70.70 μm三个范围内依次采用纳米CaCO₃（nano CaCO₃,以下简称“NC”）、G级油井水泥和漂珠,并按DFE（n=0.33~0.40）体积分布曲线进行混配。在此基础上,提出一种密度为1.50 g/cm³的低成本低温早强三元固相级配水泥浆体系,并与漂珠二元固相水泥浆体系和NC二元固相水泥浆体系的性能进行对比。研究结果表明：该三元体系水泥石的抗压强度、抗折强度和二界面胶结强度相比于漂珠二元体系和NC二元体系分别提高了7%~21.1%、13.4%~51.9%和41.4%~122.2%。三元体系的固井水泥石在垂向上的最大密度差为0.022 g/cm³。基于DFE设计的三元体系具有良好的流变性、稳定性和力学性能。DFE对于多元固井水泥浆体系的设计和应用具有一定的指导意义,在保证低密度的前提下能够有效地提高固井水泥石的早期强度和综合性能。  相似文献   

Research and application of mud proportioning optimization of slurry balance shield in mudstone and gravel composite stratum     

SONG Yang  LI Ang  WANG Wei-yi  DU Chun-sheng  ZHANG Duo  FU Xing-xing 《岩土力学》2021,41(12):4054-4062

Slurry performance is one of the key factors to maintain the stability of excavation face when slurry balance shield is tunneling in complex strata. Based on the engineering background of slurry shield tunneling in mudstone and gravel composite stratum of Nanning Metro Line 5, the control variable method and the self-made slurry shield tunneling system are adopted to compare and select the mud admixture and to analyze the influence of the admixture amount and the formation composite ratio on the slurry relative density. Then, the mud permeability law and the dynamic and static mud film forming law under different formation composite ratios, swelling water ratios and slag dosages are analyzed comprehensively by factorial design. The results show that different admixtures have significant influence on the properties of bentonite slurry. Specifically, potassium methyl silicate and potassium chloride can effectively reduce the relative density of slurry, while sodium chloride and sodium silicate can promote the disintegration of mudstone in water. In addition, the slag admixture can effectively reduce the water filtration, improving the film quality and reducing the consumption of bentonite. When the cutter head speed is less than or equal to 2.5 r/min, the formation rate of mud film is greater than or equal to the failure rate so as to ensure the stability of driving face. The mud swelling water ratio suitable for mudstone and gravel composite stratum (composite ratio: 0?1) is 0.1?0.20, the residue content is 100?200 g/kg, and the potassium methyl silicate is 3.75%?7.50%.  相似文献   

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   

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