膨胀式自应力灌浆卡箍灌浆本构关系模型的研究     

石湘  张易飞  杜颖  张伟  黄一峰 《海洋工程》2022,40(4):158-167

膨胀式自应力灌浆卡箍是一种典型的钢/灌浆组合结构,由于膨胀受限灌浆处于三向受压状态,在这种结构的强度校核中采用合适的灌浆本构模型是影响设计结果的重要因素。采用ABAQUS建模这种卡箍,构筑了三种灌浆本构关系模型,主要测试了莫尔库仑模型和塑性损伤模型的相关材料参数,然后通过一个节点灌浆卡箍的设计算例,比较和分析了三种灌浆本构模型的计算结果。仿真分析发现对于卡箍的灌浆强度校核,线弹性模型最保守,容易校核不合格,而塑性损伤模型最不保守。建议采用能反映灌浆的压碎和开裂行为的塑性损伤模型作为膨胀式灌浆卡箍强度校核分析的本构关系。研究结果可以为自应力灌浆卡箍的有限元强度校核方法提供有益的借鉴和指导。  相似文献   

X-射线衍射分析仪简介     

侯弘 《西北地质》2010,43(2):127-127

X-射线衍射分析仪X—Ray Diffractomer（XRD）是西安地质调查中心实验测试中心于2008年新引进的一台日本理学生产的X-射线衍射仪。X-射线衍射分析仪利用衍射原理,精确测定物质的晶体结构、织构及应力,精确的进行物相分析、定性分析和定量分析。广泛应用于冶金、石油、化工、科研、  相似文献   

清远稻田甲烷排放实验及技术问题   总被引：4，自引：2，他引：2  

王天龙  杨宁  杨永生  宋艳华 《广东气象》2005,(3):29-31

为测定华南地区水稻田的CH4排放量,清远市气象局与美国波特兰大学、中国气象局国家气候中心、广东省气候与农业气象中心联合在广东省清远市开展了稻田甲烷排放通量测定实验,期间利用密闭箱法共开展了一季冬旱田、两季早稻、两季晚稻的观测。在此,对实验方法进行简要的介绍,并对在实验田的选点、实验样气的采集、样气分析过程中遇到的一些技术问题及处理方法,进行探讨,以期对今后类似的观测实验中所遇到的技术问题提供有益的参考。  相似文献   

云南省区域数字地震遥测台网近震速报   总被引：1，自引：0，他引：1  

李桂华  何家斌  颜其中 《地震地磁观测与研究》2005,26(3):56-62

云南省区域数字地震遥测台网2000年开始使用新的近震定位程序KMSN-N,地震速报的精度和速度都有很大提高。从2000年的姚安Ms5．9地震到2003年的鲁甸Ms5．0地震,17次大震速报的实践,证明了定位程序KMSN-N的可靠性和实用性。本文对云南区域台网近震地震参数的测定方法进行了详细讨论,对2000-2003年间的17次大震速报与大震考察结果进行了比较。  相似文献   

Characteristics of Rare Earth and Trace Element Patterns in Bedded Cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China and Their Genetic Significance     

YU Bingsong  DONG Hailiang  CHEN Jianqiang  LI Xingwu  LIN Changsong State Key Laboratory of Geological Processes  Mineral Resources  China University of Geosciences  Beijing  Chin  Key Laboratory of Lithosphere Tectonics  Lithoprobing Technology of Ministry of Education  China University of Geosciences  Beijing  China Department of Geology  Miami University  Oxfor  OH  USA 《《地质学报》英文版》2005,79(2):215-224

The sedimentary sequence of the Lower Cambrian is a key interval to reveal the early evolution history of the Earth and there occur widespread cherts worldwide. These cherts possibly carry important information to decipher the breakup process of the Rodinia Continent. Black rock series at the bottom of the Lower Cambrian in the Northern Tarim Basin, China, is composed of black shales interbedded with thin-bedded cherts. Ten chert samples were systematically collected from two outcrops at Xiaoerbulak and Sogatbulak, 8.8 and 7.5 m thick respectively. The cherts were crushed, and were analyzed for trace element and rare earth concentrations. Trace elements such as V, Cu, Zn, U, Pb, Ba, Cd, Ag, Mo,As and Sb are highly enriched, and others such as Rb, Zr, Cs, Hf, Ta, W, T1, Bi and Th are highly depleted in the cherts.These trace element patterns suggest that the cherts may be of deep crustal origin. The low ratios of Th/U and Rb/Sr further suggest that the cherts are of earth interior sources or received hydrothermal input during their deposition. Chondritenormalized Eu/Eu* value markedly decreases upward in the section from 5.54 at the lowermost to 0.73 at the top, and NASC-normalized Eu/Eu* value decreases from 8.05 to 1.03. The relatively high Eu/Eu* ratio for the cherts from the northern Tarim Basin is most likely due to a hydrothermal input (e.g., Eu/Eu*-10). The systematic decrease of Eu/Eu* ratio from the bottom to the top of the section reflects that the hydrothermal input is the largest in the lowermost portion of the section and gradually decreases upward. The chondrite-normalized Ce/Ce* ratio ranges from 0.42 to 0.83, with an average of 0.60. North American Shale Composite (NASC)-normalized Ce/Ce* ratio ranges from 0.42 to 0.79, with an average of 0.57. Negative Ce anomalies are distinct. EREEs in the cherts generally increase from 10.50 ppm at the bottom to 35.97 ppm at the top of the sampled section. NASC-normalized (La/Lu)N ratio decreases from 2.72 at the bottom to 0.67 at the top. NASC-normalized (La/Ce)N ratio increases from 1.36 at the bottom to 3.13 at the top. These REE patterns are very similar to those for the cherts deposited in the pelagic ocean-basin floor in the Franciscan Complex exposed at Marin Headlands, California (F-MH chert) (Murray et al., 1991). These geochemical signatures are inconsistent with our previous sedimentological data, which suggests a continental shelf setting. Based on multiple lines of evidence including high TOC content in the concomitant black shales, phosphorite at the bottom of black rock series, regional rise of sea level,and beginning of the southern Tianshan Ocean geotectonic cycle, the authors infer that the hydrothermal fluid was carried to the continental shelf by upwelling from a divergent pelagic ocean floor setting.  相似文献   

非水滴定法测定土壤中的有机碳     

《化工矿产地质》2021,43(3)

  相似文献   

密闭微波消解法测定钢铁样品中的硼     

奥地利安东帕有限公司上海代表处 《岩矿测试》2009,28(1):文后II

即使在低浓度(μg/g)的情况下,硼会对钢的多种物理性能如硬度、可模锻性、可焊接性和淬透性都有不利影响。含2%(质量分数)硼的钢被核电厂用来存储和运输燃料棒,富含10B的钢具有吸收热中子的性能从而提供充分的辐射屏蔽。因此,对硼含量进行高精度和高准确的分析对于保证特种材料经济而可靠的生产具有十分重要的意义。1仪器样品的消解采用奥地利安东帕公司(Anton Paar GmbH)的Multiwave 3000微波消解仪,配16MF100转子[100 mLPTFE-TFM反应罐,程序压力2.0 MPa(20 bar)],带p/T传感器。元素分析是在PerkinElmer公司的Optima 3300 D  相似文献   

石墨管-高分辨连续光源原子吸收光谱法测定沉积物中的砷     

德国耶拿分析仪器股份公司 《岩矿测试》2009,28(3):305-305

本文的测定方法是基于有证参考物质NBS 1645/1(河水沉积物)而建立的,标物中As的含量为66mg/kg(标准值)。采用配有自动进样器的高分辨连续光源原子吸收光谱仪(HR-CS-AAS)进行测定。1样品制备称取约1g沉积物样品,在微波中用3mLφ=65%(体积分数)的HNO3(Suprapur纯)和37%的HCl(Suprapur纯)分解提取。滤液过滤至50mL,在分析之前用10%的去离子水稀释。2仪器工作参数HR-CS-AAS仪器工作参数为:测量波长193.696nm,热解(Pyrolysis)温度925℃,原子化温度2300℃,升温(Ramp)速率630℃/s,进样量20μL,基体改进  相似文献   

电感耦合等离子体发射光谱法测定钼矿石中钴铬铜钼镍铅锡钨钇锌   总被引：11，自引：7，他引：4  

赵庆令  李清彩  高玉花 《岩矿测试》2009,28(5):488-490

采用盐酸-硝酸-氢氟酸-高氯酸-柠檬酸处理样品,电感耦合等离子体发射光谱法同时测定钼矿中钴、铬、铜、钼、镍、铅、锡、钨、钇、锌10个元素,筛选了不同溶矿方法和仪器参数条件。测定的相对标准偏差(RSD,n=11)均小于3.0%,经国家一级钼矿标准物质分析验证,结果与推荐值吻合。  相似文献   

王水溶样-等离子体质谱法同时测定地质样品中砷锑铋银镉铟   总被引：16，自引：13，他引：3  

范凡  温宏利  屈文俊  曹亚萍 《岩矿测试》2009,28(4):333-336

采用王水溶样-等离子体质谱法测定地质样品中砷、锑、铋、银、镉、铟6个元素,探讨了测定过程中对砷、银、镉、铟干扰的消除问题。方法检出限(10SD,μg/g)分别为:砷0.2、锑0.01、铋0.005、银0.01、镉0.01、铟0.005;精密度(RSD,n=12)分别为砷1.3%~3.0%、锑0.65%~2.3%、铋1.2%~2.6%、银3.2%~6.6%、镉3.7%~8.0%、铟1.1%~5.0%;加标回收率分别为砷96.8%~106%、锑102%~108%、铋102%~106%、银99.7%~104%、镉103%~108%、铟97.9%~100%。用拟定方法测定了国家一级标准物质中砷、锑、铋、银、镉、铟,结果与标准值相符。方法适用于岩石、土壤、水系沉积物等地质样品的测定。  相似文献