桩后劈裂压浆施工技术          下载免费PDF全文

陈振  何文生 《探矿工程》1997,(4):11-13

阐述了桩后劈裂压浆提高单桩承载力的机理、使用设备、操作方法工艺参数和操作注意事项，并对劈裂压浆的压入量及压力进行了初步探讨。  相似文献   

地震和测井资料联合反演储层物性参数的方法   总被引：2，自引：0，他引：2  

沙磊  叶霞 《物探化探计算技术》1997,19(1):12-18

为了充分利用测井资料较高的纵向分辨率及其反映井壁周围物性直接准确的特点和地震资料良好的横向可追踪性，针对厚储层和薄储层地震—地质模型分别提出了利用测井和地震资料联合反演纵横波速度和密度参数的方法。理论模型的计算结果表明，反演方法是切实可行的  相似文献   

Observations of particle movement in a monitoring well using the colloidal borescope     

Peter M. Kearl 《Journal of Hydrology》1997,200(1-4):323-344

The colloidal borescope consists of a set of lenses and miniature video cameras capable of observing natural particles in monitoring wells. Based on field observations of these particles, it appears possible to measure in situ groundwater velocity in a well bore. Field observations have shown that directional measurements using the colloidal borescope are generally in good agreement with expected flow directions. However, the magnitude of flow velocity is higher compared with values based on conventional test methods. High relative flow velocities, even after correction factors have been applied to compensate for well bore effects, are believed to be due to preferential flow zones in the surrounding aquifer. Low flow zones exhibit swirling multidirectional flow that does not allow for a linear velocity measurement. Consequently, groundwater flow velocities measured by the colloidal borescope in heterogeneous aquifers will be biased toward the maximum velocity values present in the aquifer. A series of laboratory experiments was conducted to assess the reliability of the instrument. Based on this work, a seepage velocity correction factor ( ) of 1–4 was found for quantifying groundwater seepage velocity in the adjacent aquifer from observations in a well bore. Laboratory measurements also indicate that preferential flow in the surrounding aquifer dominates flow in the well. Results of this work suggest the possibility of quantifying higher-flow velocities associated with preferential flow zones in the subsurface.  相似文献   

端头扩大型土层锚杆技术   总被引：7，自引：0，他引：7  

夏柏如  王贵和 《地质与勘探》1997,33(3):53-55

锚固力是土锚重要的工作性指标，端头扩大型土层锚杆技术作为提高锚固力的一种有效手段虎来越得到人们的重视，为此，在这着重介绍国内外土层锚杆端头扩大技术的原理及应用发展情况。  相似文献   

福建省东部及邻区岩浆活动的构造环境与热变质作用     

周江羽  张春霖 《福建地质》1997,16(1):32-39

研究区自加里东期运动以来，经历了复杂的构造－岩浆－热演化过程。在分析岩浆活动特征及其形成的构造环境的基础上，探讨了研究区沉积岩系及其中有机质的热变质作用。  相似文献   

油田中,高含水期小层剩余油研究     

马正  桂峰 《地质科技情报》1997,16(2):57-61

综合利用岩心分析、测井及动态开发资料研究了扶余油田西一、二区北的剩余油分布规律，所研制的油田中、高含水期确定小层剩余油分布图，解决了油田开发中的动态预测小层剩余油分布的难题，并且对１９８２年和１９９２年底的剩余油分布规律作了分析。  相似文献   

静力弹塑性分析(Pushover Analysis)的基本原理和计算实例   总被引：86，自引：3，他引：86  

汪大绥  贺军利  张凤新 《世界地震工程》2004,20(1):45-53

阐述了美国两本手册FEMA273／274和ATC-40中关于静力弹塑性分析的基本原理和方法，给出了利用ETABS程序进行适合我国地震烈度分析的计算步骤，并用一框剪结构示例予以说明，表明Pushover方法是目前对结构进行在罕遇地震作用下弹塑性分析的有效方法。  相似文献   

建筑结构抗震能力评估技术的研究及应用     

杨仕升  秦荣  赵小莲  谢开仲 《世界地震工程》2004,20(4):100-106

简要介绍影响建筑结构抗震能力的主要因素，重点评述目前建筑结构抗震能力评估的主要技术方法并指出其存在的问题，展望今后抗震能力评估技术的应用及发展趋势。  相似文献   

Parameters of Land-Surface Processes for Gobi in North-West China   总被引：1，自引：0，他引：1  

Zhang Qiang  Huang Ronghui 《Boundary-Layer Meteorology》2004,110(3):471-478

Using data from the intensive observation period (May–June 2000) of the NWC-ALIEX (The Field Experiment on Interaction between Land and Atmosphere in Arid Region of North-west China), the characteristics and mechanisms of some key land-surface process over Gobi in a typical arid region of north-west China are analyzed and several parameters of land-surface processes are calculated. The weighted mean of the surface albedo over a typical arid region of the Dunhuang Gobi is calculated using the relative reflection as a weighting factor, and its value is 0.255 ± 0.021. After removing the influence of precipitation, the mean soil heat capacity over a typical arid region of the Dunhuang Gobi is 1.12 × 10⁶ J m^-3 K^-1,which is smaller than that observed in the Heihe (China) River basin Field Experiment (HEIFE). The mean soil heat diffusivity and conductivity are about half of those observed in HEIFE.  相似文献   

上海地区扁铲侧胀试验计算地基承载力的探讨   总被引：1，自引：1，他引：1  

樊向阳  莫群欢  张继红 《岩土工程技术》2004,18(3):126-129

通过对扁铲侧胀试验和试验机理的研究和对试验指数的对比分析 ,提出了用扁铲侧胀试验计算地基承载力的方法 ;利用上海地区部分重大工程中的扁铲侧胀试验数据 ,在与室内土工试验、静力触探试验及十字板剪切试验的相关分析的基础上 ,经数理统计后给出了上海地区用扁铲侧胀试验计算地基承载力的经验公式。最后 ,通过与室内土工试验、静力触探试验和十字板剪切试验计算的地基承载力对比 ,分析了本经验公式计算地基承载力的精度。研究分析表明 ,可以用扁铲侧胀试验计算地基承载力  相似文献