郯庐断裂带中南段重磁综合剖面探测研究

郯庐断裂中南段在第四纪以来活断层最发育,历史上曾发生过多次中强以上地震,是中国目前主要地震活动区域之一。汶川8.0级地震发生后,地下流体观测井多测项震后效应在郯庐断裂带中南段部分地区一直持续存在,同时速度结构研究表明该区域存     

2011年1月安徽安庆4.8级地震烈度与房屋震害

2011年1月19日安徽省安庆市Ms4.8级地震发生后,笔者在第一时间深入地震灾区,开展了地震烈度调查和地震灾害评估工作.本文基于现场调查结果,对此次地震的构造背景、烈度分布及房屋典型震害进行了分析,并对经验教训进行了初步总结.     

Formation Mechanism of the Changxing Formation Gas Reservoir in the Yuanba Gas Field, Sichuan Basin, China

In a very gentle platform-margin paleogeographic environment, platform-margin reef flat facies carbonate reservoir rocks were developed in the Changxing Formation of Yuanba field. Later weak structural evolution and diagenetic evolution caused the Changxing Formation to form lithologic traps, with good reservoirs such as dissolved bioclastic dolostone and dissolved pore dolostone. The Changxing Formation gas reservoir is a pseudo-layered porous lithologic gas reservoir under pressure depletion drive, with high H2S and moderate CO2 contents. This paper predictes that the conducting system for the Changxing Formation gas reservoir is possibly composed of the pores and microfractures in the Changxing Formation reservoir, the top erosional surface of the Changxing Formation, as well as the micropores and microfractures in the underlying formations. The Changxing Formation reservoir has experienced 3 hydrocarbon charging stages. This paper suggests that diffusion is the major formation mechanism for this gas reservoir. In the Middle and Late Yanshanian, the Yuanba area entered the major gas charging stage. The gas migrated mainly through diffusion and with the assistance of seepage flow in small faults and microfractures from the source rocks and the other oil-bearing strata to the Changxing Formation carbonate reservoir rocks, forming lithologic gas pools. In the Himalayan Epoch, the lithologic traps were uplifted as a whole without strong modification or overlapping, and were favorable for gas preservation.     

基于重力差方法检测重力仪一次项格值系数变化

根据重复重力测量中重力差与重力仪一次项格值系数的关系,研究了基于重力差变化检测重力仪一次项格值系数变化的方法,并以滇西重力网1989-1996年观测资料为例,计算了 G793、G854两台仪器一次项格值系数的变化结果.实验结果表明,利用该方法计算得到的一次项格值系数变化值精度能满足地震重力测量规范要求,对于重力仪一次项...     

A soil temperature control system for sapling study in alpine region

A soil temperature control system was designed for sapling study in alpine region and tested in summer, 2009. The system consisted of a power switch, voltage regulator, microcomputer timer, safety relays, temperature control device, temperature sensors, heating cables, fireproofing plastic pipes (PVC), 108 heavy-duty plastic containers and seedlings. The heating cables were held in six 2-layer PVC frames with 25 cm wide, 320 cm long and 25 cm high and three 1-layer frames with 25 cm wide and 320 cm long for 15°C soil temperature treatment, half of the 2-layer frames were used for 20°C and 25°C soil temperature treatments, respectively. Each of the frames was installed at each of ditches with 30 cm wide, 330 cm long and 30 cm deep in size. 12 seedling containers with 20 cm top diameter, 18cm bottom diameter and 25 cm high were homogenously placed at each of the ditches, and spaces between the containers were filled with natural soil. The system was economic, and could increase soil temperatures obviously and uniformly, the maximal and minimal standard errors of soil temperatures were ±0.28 and ±0.05°C at 10cm depth in the containers within each of all the ditches. In the system, aboveground environment was natural, diurnal and monthly soil temperatures varied with changing air temperature, the research results may be better to know the eco-physiological and growth responses of alpine saplings/seedlings to soil warming than that in greenhouse, laboratory, infrared heat lamp and open top chamber.     

解析法和数值法在丘陵地区矿坑涌水量预测中的比较

丘陵地区地下水资源不丰富,依赖于地下水的生态环境也比较脆弱。在开采该地区的矿产资源过程中,采矿排水对周边地下水资源的影响应成为值得注意的问题。以安徽省庐江县某一铁矿为例,采用解析法和数值法分别对该矿矿坑涌水量进行预测,并将两种方法的预测结果进行了对比分析。结果表明：在-500 m开采条件下,计算结果分别为41991．44 m3/d和3150 m3/d,得出数值法更适合水文地质复杂条件下矿坑用水量的预测,且与实测结果较为吻合,具有一定实用性,可为矿山制定防排水方案提供依据。     

强震前典型重力场变化与数值预测实验

对中国大陆7次强震前出现的典型重力场变化图像（梯度带和四象限）及其量化参数进行总结。结果表明,目前采用的地震预测指标具有一定的不确定性,与测网观测时段、测点空间分布、变化幅值空间差异等具有密切关系;芦山地震前潮汐因子异常空间范围是流动重力典型变化范围的近10倍,可能与连续重力观测站的精度比流动重力联测高1个数量级有关。基于闭锁剪力模式提出利用典型重力变化图像进行地震数值预测的方法,强震前在孕震源存在的双力偶闭锁剪力的持续作用下,走滑型力偶会在地表引起四象限重力变化,倾滑型力偶会在地表引起二象限（梯度带）重力变化。预测回溯算例实验结果初步表明,该方法对走滑型和倾滑型地震的震级预测较为有效,同时可给出未来地震的地点和类型。     

吉林白山五道羊岔新太古代大型钒钛磁铁矿床地质特征及锆石U-Pb年龄

吉林白山五道羊岔新太古代大型钒钛磁铁矿是国内外首次发现的产于斜长角闪岩层状侵入体内的岩浆型铁矿,对于相似成矿地质条件区矿产资源勘查具有重要意义。该矿床位于吉林省南部龙岗古陆核南部边缘,板石沟绿岩带北侧。Ⅰ、Ⅱ、Ⅵ号矿体位于斑杂状斜长角闪岩层状侵入体内,并具有成因联系。该岩体原岩为正角闪岩,构造环境为汇聚边缘岛弧环境。矿体形态为层状,矿石结构主要为自形-半自形-他形晶粒状结构、固熔体分离结构、海绵陨铁结构,矿石构造有致密块状构造、条带状构造、浸染状构造等。矿石金属矿物主要为磁铁矿、钛铁矿。对磁铁矿、钛铁矿进行了电子探针微区成分分析,磁铁矿成因类型为岩浆熔离钛磁铁矿型。钛铁矿与理论化学成分基本一致。对斑杂状斜长角闪岩层状侵入体中锆石进行了地球化学分析,其稀土元素及微量元素特征显示锆石为岩浆锆石,采用LA-ICP-MS法进行了U-Pb定年,获得一条较好的不一致线,上交点年龄为(2526±35)Ma。     

激光热透镜法测定水中痕量磷的研究

本文采用激光热透镜分析法测定水中痕量磷．研究并讨论了测定磷的各种影响因素，并与分光光度法进行比较．结果表明，热透镜分析方法比分光光度法具有较高的灵敏度．其线性范围为２～６０ｎｇＰ／ｍＬ，方法检出限为０．４ｎｇＰ／ｍＬ．用于雨水及地下水中痕量磷测定，结果满意．     

钢筋混凝土预制拼装柱扭转力学性能数值模拟与参数分析

采用ABAQUS大型有限元分析软件开展预制拼装柱扭转力学性能数值模拟及参数分析,研究了轴压比、灌浆套筒位置及长度、预制构件拼接缝界面黏结强度对灌浆套筒连接中柱抗扭性能的影响。研究结果表明:轴压比会显著影响预制拼装柱抗扭承载力和变形,而灌浆套筒位置和长度对预制拼装柱抗扭力学性能的影响不明显;预制构件拼接缝界面黏结强度显著影响预制拼装柱抗扭性能。基于预制拼装构件和现浇构件力学性能的对比分析,提出了轴向荷载和扭矩共同作用下灌浆套筒连接预制拼装柱抗扭承载力设计方法。