水泥粉喷桩在软基中的应用     

焦银禾 《中国勘察设计》2009,(8):54-55

简要阐述了水泥粉喷桩设计要求、施工工艺、效果检测,对地基承载力的影响,具有广阔的应用前景。  相似文献   

Stabilization of Expansive Clays Using Granulated Blast Furnace Slag (GBFS) and GBFS-Cement   总被引：1，自引：0，他引：1  

Erdal Cokca  Veysel Yazici  Vehbi Ozaydin 《Geotechnical and Geological Engineering》2009,27(4):489-499

Expansive clays undergo swelling when subjected to water. This can cause damage, especially to light weight structures, water conveyance canals, lined reservoirs, highways, and airport runways unless appropriate measures are taken. In this study, granulated blast furnace slag (GBFS) and GBFS-cement (GBFSC) were utilized to overcome or to limit the expansion of an artificially prepared expansive soil sample (sample A). GBFS and GBFSC were added to sample A in proportions of 5–25% by weight. The effects of these stabilizers on grain size distribution, Atterberg limits, swelling percentage and rate of swell of soil samples were determined. GBFS and GBFSC were shown to successfully decreasing the total amount of swell while increasing the rate of swell.  相似文献   

塔中上奥陶统方解石胶结物类型及其形成环境     

王振宇  ;吴丽  ;张云峰  ;韩剑发  ;张丽娟 《西安地质学院学报》2009,(3):265-271

通过对塔中地区上奥陶统数百块碳酸盐岩薄片和抛光面中各种方解石胶结物特征和成因的观察,并结合微量元素和碳、氧同位素分析,共识别出11种胶结物类型。详细描述了各胶结物的特征,并确定了胶结物的分布和形成次序。在此基础上对该区碳酸盐岩方解石胶结物形成环境进行了分析,共划分出海底成岩环境、大气水成岩环境和埋藏成岩环境。从而为该区孔隙演化史的建立和有利勘探目标预测提供了有力的依据。  相似文献   

Heating duration of igneous rim formation on a chondrule in the Northwest Africa 3118 CV3oxA carbonaceous chondrite inferred from micro-scale migration of the oxygen isotopes     

《Chemie der Erde / Geochemistry》2019,79(4):125524

Due to their common occurrence in various types of chondrites, igneous rims formed on pre-existing chondrules throughout chondrule-forming regions of the solar nebula. Although the peak temperatures are thought to reach similar values to those achieved during chondrule formation events, the heating duration in chondrule rim formation has not been well defined. We determined the two-dimensional chemical and oxygen isotopic distributions in an igneous rim of a chondrule within the Northwest Africa 3118 CV3_oxA chondrite with sub-micrometer resolution using secondary ion mass spectrometry and scanning electron microscopy. The igneous rim experienced aqueous alteration on the CV parent body. The aqueous alteration resulted in precipitation of the secondary FeO-rich olivine (Fa_40–49) and slightly disturbed the Fe-Mg distribution in the MgO-rich olivine phenocrysts (Fa_11–22) at about a 1 μm scale. However, no oxygen isotopic disturbances were observed at a scale greater than 100 nm. The MgO-rich olivine, a primary phase of igneous rim formation, has δ¹⁷O = −6 ± 3‰ and δ¹⁸O = −1 ± 4‰, and some grains contain extreme ¹⁶O-rich areas (δ¹⁷O, δ¹⁸O = ∼−30‰) nearly 10 μm across. We detected oxygen isotopic migration of approximately 1 μm at the boundaries of the extreme ¹⁶O-rich areas. Using oxygen self-diffusivity in olivine, the heating time of the igneous rim formation could have continued from several hours to several days at near liquidus temperatures (∼2000 K) in the solar nebula suggesting that the rim formed by a similar flash heating event that formed the chondrules.  相似文献   

Diagenesis impact on a deeply buried sandstone reservoir (Es1 Member) of the Shahejie Formation,Nanpu Sag,Bohai Bay Basin,East China     

M. Kashif  Y. Cao  W. Jian  X. Cheng  P. Sun 《Australian Journal of Earth Sciences》2019,66(1):133-151

Diagenesis has a significant impact on reservoir quality in deeply buried formations. Sandstone units of the Shahejie Formation (Es₁ Member) of Nanpu Sag, Bohai Bay Basin, East China is a typical deeply buried sandstone with large hydrocarbon accumulations. The methodology includes core observations and thin section studies, using fluorescence, scanning electron microscope (SEM), cathodoluminescence (CL), fluid inclusion and isotope and electron probing analysis as well as the numerical determination of reservoir characteristics. The sandstones consist of medium to coarse-grained, slight to moderate sorted lithic arkose and feldspathic litharenite. Porosity and permeability values range from 0.5 to 30% and 0.006 to 7000 mD, respectively. The diagenetic history reveals mixed episodes of diagenesis and deep burial followed by uplift. The main diagenetic events include compaction, cementation alteration, dissolution of unstable minerals and grain fracturing. Compaction resulted in densification and significantly reduced the primary porosity. Quartz, calcite and clay are the dominant pore-occluding cement and occur as euhedral to subhedral crystals. Alteration and dissolution of volcanic lithic fragments and pressure solution of feldspar grains were the key sources of quartz cement whereas carbonate cement is derived from an external source. Clay minerals resulted from the alteration of feldspar and volcanic lithic fragments. Porosity and permeability data predict a good inverse relationship with cementation whereas leaching of metastable grains, dissolution of cement and in some places formation of pore-lining chlorite enhanced the reservoir quality. The best reservoir is thicker sandstone bodies that are medium to coarse-grained, well-sorted sandstone with low primary ductile grains with a minor amount of calcite cement. The present study shows several diagenetic stages in the Es₁ Member, but the overall reservoir quality is preserved.  相似文献   

新和地1井复杂地层水泥封孔护壁造斜技术          下载免费PDF全文

肖长城  贾中芳  高士彬  李明 《探矿工程》2019,46(2):50-54

新和地1井在钻进1314.00～1419.98 m孔段时钻遇巨厚破碎带,地层高度破碎、大倾角、富含水系,孔壁掉块、水敏坍塌现象严重。钻进时孔内阻力大,钻具放不到底,孔内事故多发,破碎带难以钻穿。为处理孔内事故并钻穿巨厚破碎带,采用水泥封孔护壁造斜技术。受孔内复杂因素影响,特别是1358.76～1396.46 m破碎带内水系对水泥浆的稀释和冲蚀破坏作用,前期多次水泥封孔失败,浪费了大量物资及工期。现场通过试验,总结出了一套有针对性的、实用的技术方案,解决了现场的水泥封孔技术难题,提高了水泥封孔护壁造斜的成功率。新和地1井深孔复杂地层水泥封孔护壁造斜技术对今后施工类似工程具有一定的参考意义。  相似文献   

Atomistic simulation of Mg2SiO4 and Mg2GeO4 spinels: a new model     

M. Blanchard  K. Wright  J. D. Gale 《Physics and Chemistry of Minerals》2005,32(5-6):332-338

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Mineralogical changes during thermal demagnetization of natural continental sandstones     

C. Prezzi  R. Somoza  R. C. Mercader 《Studia Geophysica et Geodaetica》2005,49(2):213-232

We study the mineralogical changes suffered by specimens of natural miocene red and green continental sandstones (from Pozuelos Formation and Tiomayo Formation) cropping out in the Argentine Puna that increase their bulk magnetic susceptibility and change color when thermally treated. We hypothesize that on heating siderite, which is present in small quantities as cement in the studied sandstones, would oxidize and decompose into maghemite and/or magnetite. Subsequent heating to higher temperatures sometimes would bring about the conversion of maghemite and/or magnetite to hematite. Mössbauer spectroscopy proved to be a very valuable tool for the determination of the presence of siderite in small amounts in the studied samples. The present results show that further work is needed in order to fully understand the mineralogical changes suffered by continental sandstones during heating. The characterization of such changes occurred during laboratory routines is relevant, since they can help to better understand natural processes.  相似文献   

水热法提纯制备氢氧化镁的研究          下载免费PDF全文

闫修川  李召好  马培华  李法强  邓小川 《盐湖研究》2006,14(1):36-39

以盐湖工业副产物氢氧化镁作为原料，在水热条件下，对氢氧化镬进行溶解——重结晶除杂。并对水热后氢氧化镁产品进行了表征，结果令人满意。  相似文献   

阻燃级氢氧化镁制备过程中表面有机化改性   总被引：7，自引：0，他引：7       下载免费PDF全文

李晓崑  陈建军  孙海霞  关云山  王爱丽 《盐湖研究》2006,14(1):60-65

文章通过论述阻燃剂型氢氧化镁制备过程中的表面有机化改性,对改性剂、作用机理和改性工艺等进行了探讨,说明了对阻燃剂型氢氧化镁表面有机化改性的重要性,及在氢氧化镁制备过程中综合分析、系统研究的必要性。  相似文献