新型科学钻探技术体系的产生及其意义     

王达 《探矿工程》2006,33(1):1-5

在中国大陆科学钻探工程“科钻一井”的钻井施工中，形成了独具中国特色的新型科学钻探技术体系。详细论述了该新型科学钻探技术体系的具体内容及其在“科钻一井”施工中取得的主要技术指标；简要介绍了目前国内正在或即将实施的科学钻探工程项目情况；结合即将出台的《国务院关于加强地质工作的决定》和2005年已启动的危机矿山接替资源的找矿勘查工作计划，展示了探矿工程广阔的前景。  相似文献   

Atmospheric Measurements of HONO by Tunable Diode Laser Absorption Spectroscopy     

C. L. Schiller  S. Locquiao  Timothy J. Johnson  G.W. Harris 《Journal of Atmospheric Chemistry》2001,40(3):275-293

Ambient gas phase nitrous acid (HONO) has been measured by Tunable Diode Laser Absorption Spectroscopy with sub-ppbv detection limits. An R-branch line in the 1263.4 cm^–1 ₃ band was found tobe free of interference and suitable for ambient HONO measurements. Nitrous acid was measured during the night and early morning at an urban site in Toronto, Canada, during the summer of 1998. Average mixing ratios, integrated over 30 minutes, ranged from below the minimum detection limit of 300 pptv to 1.9 ppbv, with the highest concentrations observed during the early morning hours. During the night of 19 June 1998, the concentration of HONO increased by as much as 0.5 ppbv/hr. The usual decrease in HONO after sunrise was delayed by a few hours, possibly due to a combination of an increase in the production rate of HONO with rush hour, and attenuation of the early morning light by high NO₂ within the aerosol fog/haze.  相似文献   

Heat Flow Pattern in the Mainland of China and Its Geodynamic Significance   总被引：13，自引：0，他引：13  

WANG Yang  School of Earth Science  Resources  China University of Geosciences  Beijing WANG Jiyang  XIONG Liangping Institute of Geology  Chinese Academy of Sciences  Beijing 《《地质学报》英文版》2000,74(2):375-380

On the basis of 723 heat flow measurements in the mainland of China and over 2000 data from the global heat flow data set, the authors compiled the heat flow map of the mainland of China and its adjacent areas to exhibit the overall variation of the heat flow pattern in the mainland. The heat flow pattern of the mainland is complex, and can not be simply summarized as "low in the north and west and high in the south and east". Significant difference exists between eastern and western China in the spatial pattern of heat flow. Divided by the 105°E meridian, heat flow values in eastern China show a westward-decreasing trend; and a northward variation is observed in western China. The high-heat flow regions correspond to tectonically active belts such as Cenozoic orogens and extensional basins, where mantle heat flow is high; and the low-heat flow regions correspond to stable units such as the Tarim and Yangtze platforms. This heat flow pattern is controlled by India-Asia collision in the west and Pacific  相似文献   

软质岩承载力特征值确定方法的探讨     

吴炎森 《矿产与地质》2005,19(4):455-457

通过对确定软质岩承载力特征值的四种方法即理论计算、抗压强度试验、现场岩基载荷试验和旁压试验的结果的对比与探讨,探讨确定软质岩承载力特征值的合理有效的方法.  相似文献   

Geotechnical evaluation of Miocene gypsum from Sivas (Turkey)   总被引：2，自引：0，他引：2  

Ergun Karacan  Işik Yilmaz 《Geotechnical and Geological Engineering》2000,18(2):79-90

Gypsum is widely distributed in Sivas (Turkey), occurring chiefly in the formations of Miocene age. The gypsum is generally of the alabastrine type with a little of the porphiroblast type and contains traces of clay minerals, anhydrite and calcite. It is a moderately strong rock in terms of its unconfined compressive strength which is related to the crystal size. Strength increases as the crystal size decreases. The strength of gypsum was reduced by approximately 55%, when the samples were kept in the water for 20 days. Most samples exhibit plastic–elastic–plastic deformation. The gypsum has a high modulus ratio, and is a moderately deformable rock. High lateral deformations and low vertical deformations are observed under the vertical stress conditions in accordance with the relationship between modulus ratio and strain.  相似文献   

石砌体结构抗震抗剪强度理论的应用   总被引：10，自引：0，他引：10  

余建星  施养杭  吴海欣  李旲 《地震工程与工程振动》2000,20(1):63-67

本文基于石砌墙体的拟动力实验、工程实践及震害经验,经分析研究,提出石砌体结构的抗震设计强度验算及抗震设计方法,并结合实际工程计算,验证了本研究的可靠性与实用性。  相似文献   

裂隙水压力对岩体强度的影响   总被引：38，自引：7，他引：31  

朱珍德  胡定 《岩土力学》2000,21(1):64-67

运用断裂力学理论定量地分析了裂隙长度、方向、间距对岩石强度的影响, 详细推导了含裂隙水压力岩体的初始开裂强度公式。 通过有关试验结果证实, 所建立的公式具有较高的可靠性, 可用于暴雨入渗边坡和实际工程岩体稳定性评价。  相似文献   

拉压性能不同材料圆环极限压力分析及应用   总被引：1，自引：0，他引：1  

李晓军  贝志辉  张登良 《岩土力学》2000,21(3):264-266

应用双剪应力强度理论对拉压异性材料制成的圆环进行了弹塑性应力分析, 得到了弹性极限内压力、弹塑性极限内压力与拉压比的关系式, 并举例说明了其在岩土材料抗拉强度测试中的应用。  相似文献   

点荷载试验在岩基强度和承载力评价中的应用   总被引：1，自引：0，他引：1  

董平  曹健  纪广强  胡德昭 《高校地质学报》2000,6(4):600-604

岩石点荷载试验可以求得岩石点荷载强度指数,由点荷载强度可以 计算出岩石的单轴抗压强度,进而可计算出岩基承载力。 利用点荷载试验方法对南京地区的多个人工挖孔桩工地的孔底岩基强 度和承载力进行了评价,具体指导了挖孔桩的挖进工作,取得了良好效果。  相似文献   

膨胀性泥岩应力-应变关系的试验研究   总被引：4，自引：0，他引：4  

李杭州  廖红建  孔令伟  冷先伦 《岩土力学》2007,28(1):107-110

通过应变控制式固结不排水三轴试验,测定并分析了膨胀性泥岩的应力-应变关系以及强度变化特性,结果表明,膨胀性泥岩的应力-应变曲线呈应变软化型,泥岩中的裂隙结构面等是影响泥岩强度的重要因素,说明了膨胀性泥岩不同的破坏模式对应着不同的应力-应变曲线;还说明了峰值强度、残余强度以及残余强度比是随围压的变化而变化的;孔隙水压力变化分为3个阶段。通过控制不同的剪切速率的固结不排水三轴试验,研究和分析了应变率对应力-应变关系、强度变化特性以及孔隙水压力的变化  相似文献