FGC-15D large-diameter DTH air hammer drilling system and its application in offshore rock-socketed pile hole drilling   总被引：1，自引：0，他引：1  

Kun YIN Jianming PENG Maosen WANG Zhanjiang ZHOU 《东北亚地学研究》2006,9(2):138-140

In the past two decades,numerous large-diameter rock-socketed piles were constructed in China to support foundations of skyscrapers,great bridges or to retain soil in potential geological hazard areas.However,drilling large-diameter rock-socketed pile holes with conventional drilling method such as rotary drilling or cable tool drilling is time-consuming and the cost is usually very high.In order to drill large-diameter rock-socketed pile holes faster at relatively low cost,the FGC15A large-diameter DTH air hammer drilling system was developed in 1987 and was given the second-class award by Ministry of Geology and Mineral Resources in 1991.Since it was innovated the drilling system has been used in more than twenty important and tough projects on land,and wonderful results were acquired.At the same time the large-diameter DTH air hammer drilling system was improved continuously.The FGC15D is the latest version of the technique.  相似文献   

模糊集合理论在化学中的应用Ⅳ——百里酚酞-茜素黄R混合指示剂的研究     

胡颜  李华样 《广东海洋大学学报》1989,(Z1)

本文应用模糊集合理论和计算机研究百里酚酞-茜素黄R混合指示剂的变色现象。发现其变色存在滞后现象。讨论了产生滯后现象的原因。  相似文献   

高产池塘白鲢鱼苗鱼种生长的研究     

冯晓宇  童合一  谭玉钧 《广东海洋大学学报》1989,(Z1)

本文对高产养鱼池塘中白鲢鱼苗鱼种阶段的生长特性和规律进行了研究。经统计分析表明:1、白鲢鱼苗鱼种阶段的生长过程中,全长和时间的关系均呈直线相关(L=a bt)。鱼种全长以7-8两月生长最快。日增长率、瞬时增长率以鱼苗阶段居高,鱼种阶段次之。2、白鲢鱼苗阶段体重和时间呈指数相关(W=ae~(bt)),体重生长之速度(dw/dt)和加速度(d~2w/dt~2)与时间成正比。3、鱼种阶段体重与时间呈“S”形曲线相关(W=K/1 ae~(-bt)),体重的生长则以7～9月间最快。生长曲线拐点在t=-1n(1/a)/b;W=k/2。体重生长之速度和加速度分别呈“正态”和“正弦”曲线形。日增重率、瞬时增重率和相对增重率亦以鱼苗阶段较大,鱼种阶段次之。  相似文献   

利用时序图设计异步计数器的一种方法     

陈鳥常 《广东海洋大学学报》1989,(Z1)

本文利用时序图设计异步计数器的方法,对选擇合适的时钟脉冲和直接获得最简化的卡诺图,是最简便的  相似文献   

Characteristics of Overpressure Systems and Their Significance in Hydrocarbon Accumulation in the Yinggehai and Qiongdongnan Basins, China   总被引：1，自引：0，他引：1  

XIE Xinong  WANG Zhenfeng  LI Sitian  ZHANG Minqiang  YANG Jihai Faculty of Earth Resources  China University of Geosciences  Wuhan  Hubei  E-mail: xnxie@cug.edu.cn  China National Offshore Oil Nanhai West Corporation  Zhanjiang  Guangdong 《《地质学报》英文版》2003,77(2):258-266

Overpressure systems are widely developed in the central depression and paleo-uplift in the Yinggehai and Qiongdongnan basins. They can be divided into three types according to the origin of abnormally high formation pressure in the reservoirs, i.e. the autochthonous, vertically-transmitted and laterally-transmitted types. The autochthonous overpressure system results from rapid disequilibrium sediment loading and compaction. In the allochthonous overpressure system, the increase of fluid pressure in sandstone originates from the invasion of overpressured fluid flowing vertically or laterally through the conduit units. The autochthonous overpressure system occurs in the deep-lying strata of Neogene age in the central depression of the Yinggehai and Qiongdongnan basins. The vertically transmitted overpressure system is developed in the shallow strata of Late Miocene and Pliocene ages in the diapiric zone of the central Yinggehai basin, and the laterally transmitted overpressure system occurs in the Oligo  相似文献   

THE RECORD OF YOUNGER DRYAS EVENT IN EOLIAN SAND DEPOSIT IN QAIDAM BASIN     

曾永年  马海州  沙占江  李玲琴  李珍  曹广超 《中国地理科学(英文版)》1999,9(1):92-95

DansgaardandothersholdtheviewthatsevereclimaticfluctuationinthelateglacialiscausedbyadjustmentoftheNorthAtlanticcurrent,whichmainlyaffectstheclimateintheNorthAtlanticOCean.ButtherePOrtsabouttheYoungerDryaseventfoundin..varioussedimentsofdifferentplacesprovethatYoungerDryaseventisaclimaticeventoverthegloberatherthanaregion.InrecentyearstherearemanyrePOrtsaboutYoungerDryaleventfoundinmarineandcontinentalsedimentsofmiddlelatitudeinChina.NowitisindubitablethattheYoungerDryaseventexistsinCh…  相似文献   

青藏高原玉树地区巴塘高寒草甸土壤温湿特征分析   总被引：6，自引：1，他引：5  

张娟  沙占江  徐维新 《冰川冻土》2015,37(3):635-642

在青藏高原腹地青海省玉树藏族自治州玉树县巴塘高寒草甸草场设立野外试验场, 进行土壤温、湿动态监测. 利用温、湿监测数据及同步气象数据资料, 采用对比分析及线性趋势等方法, 分析了巴塘高寒草甸日、年土壤温、湿变化状况. 结果表明: 土壤温度从10:00时左右开始上升, 至17:00-18:00时达到最高值, 然后开始下降, 在第二天9:00时左右到达最低; 土壤湿度在10:00时达到最低值, 在18:00时达到最大值, 随着土壤深度的增加, 土壤湿度逐渐降低. 土壤温、湿度在不同的季节表现出不同的变化趋势, 二个点不同土层表现出相对一致的变化, 随着土壤深度的增加, 土壤温、湿度逐渐降低; 随着与雪栅距离的增加, 土壤温、湿度的变化幅度减弱; 随着土壤深度的增加, 雪栅的影响也逐渐减小. 通过对土壤温、湿不同时期的特征分析, 5月中旬至8月中旬, 土壤湿度与土壤温度呈现相反的变化趋势, 而在其余时期土壤温湿变化趋势一致; 秋季向冬季转换时, 土壤温湿呈显著下降趋势, 而后土壤进入封冻时期; 冬季向春季转换时, 土壤温湿呈显著上升趋势, 土壤进入解冻时期. 冷季时, 25 cm土壤温度高于5 cm; 暖季时, 5 cm土壤温度高于25 cm.  相似文献   

南海琼东南盆地天然气水合物稳定域分布特征及资源预测   总被引：39，自引：14，他引：25       下载免费PDF全文

陈多福  李绪宣  夏斌 《地球物理学报》2004,47(3):483-489

琼东南盆地油气地质显示盆地内具有生物成因和热成因天然气的巨大生成能力和远景. 地震剖面显示盆地内发育有泥底辟和气烟囱、沟通泥底辟和气烟囱与海底的断裂及可能正在活动的天然气冷泉,这些特征非常有利于天然气水合物的发育. 通过天然气水合物热力学稳定域预测,确定了琼东南盆地天然气水合物的平面和剖面分布特征. 生物成因甲烷水合物分布于水深大于约600m的海底,稳定带最大厚度约314m;热成因天然气水合物分布于水深大于约450m的海区,稳定带最大厚度约410m. 盆地内天然气水合物远景总量约10×109m3,水合物天然气远景为1.6×1012m3.  相似文献   

Pressure Prediction for High-Temperature and High-Pressure Formation and Its Application to Drilling in the Northern South China Sea     

WANG Zhenfeng  XIE Xinong CNOOC Limited-Zhanjiang  Zhanjiang Guangdong  Faculty of Earth Resources  China University of Geosciences  Wuhan  Hubei 《《地质学报》英文版》2004,78(3):640-643

There are plentiful potential hydrocarbon resources in the Yinggehai and Qiongdongnan basins in the northern South China Sea. However, the special petrol-geological condition with high formation temperature and pressure greatly blocked hydrocarbon exploration. The conventional means of drills, including methods in the prediction and monitoring of underground strata pressure, can no longer meet the requirements in this area. The China National Offshore Oil Corporation has allocated one well with a designed depth of 3200 m and pressure  相似文献   

细基江篱喷霧裁培试验     

刘思俭  曾淑芳  揭振英  刘莉 《广东海洋大学学报》1989,(Z1)

本文探讨了用噴雾栽培细基江篱的新方法。试验表明:此法能有效地避开自然海区对细江篱的生物敌害,促进藻体生长,比自然海区可增产,而且藻体清洁干净,收获方便。  相似文献