海涂围垦工程中悬挂式爆破挤淤基础处理技术探讨

沿海软土地基围涂工程中悬挂式爆破挤淤基础处理断面结构设计中遇到的最大难题是对腰宽的处理,腰宽太窄则工后沉降大,反之,则断面石方量增大,投资增加,因此,试图通过工程实例说明悬挂式爆破挤淤基础处理断面设计及工程实施过程中遇到的问题及对策措施。     

A laboratory study on capillary sealing efficiency of Iranian shale and anhydrite caprocks

Caprock has the most important role in the long term safety of formation gas storage. The caprocks trap fluid accumulated beneath, contribute to lateral migration of this fluid and impede its upward migration. The rapid upward passage of invasive plumes due to buoyancy pressure is prevented by capillary pressure within these seal rocks. In the present study, two main seal rocks, from the Zagros basin in the southwest of Iran, a shale core sample of Asmari formation and an anhydrite core sample of Gachsaran formation, were provided. Absolute permeabilities of shale and anhydrite cores, considering the Klinkenberg effect, were measured as 6.09 × 10⁻¹⁸ and 0.89 × 10⁻¹⁸ m², respectively. Capillary sealing efficiency of the cores was investigated using gas breakthrough experiments. To do so, two distinct techniques including step by step and residual capillary pressure approaches were performed, using carbon dioxide, nitrogen and methane gases at temperatures of 70 and 90 °C, under confining pressures in the range 24.13–37.92 MPa. In the first technique, it was found that capillary breakthrough pressure of the cores varies in the range from 2.76 to 34.34 MPa. Moreover, the measurements indicated that after capillary breakthrough, gas effective permeabilities lie in range 1.85 × 10⁻²¹ – 1.66 × 10⁻¹⁹ m². In the second technique, the minimum capillary displacement pressure of shale varied from 0.66 to 1.45 MPa with the maximum effective permeability around 7.76 × 10⁻²¹ – 6.69 × 10⁻²⁰ m². The results indicate that anhydrite caprock of the Gachsaran formation provides proper capillary sealing efficacy, suitable for long term storage of the injected CO₂ plumes, due to its higher capillary breakthrough pressure and lower gas effective permeability.     

两项新技术及其在海水苗种生产中的应用

本文介绍了两项新技术，用泡沫净化空气、海水和生物效应灯，及其在海水苗种生产中的应用。文中分别讨论了它们的原理、设计安装及使用效果。希望这两项新技术能够得到推广，以提高出苗率，增加海水苗种生产的经济效益。     

基于WRF驱动的CLM模型对青藏高原地区陆面过程模拟研究

NCAR-CLM是目前国际上发展较为完善的陆面过程模型.鉴于大多数研究利用气象站点的数据驱动CLM模型, 尝试将WRF气候模型的模拟结果作为驱动CLM的面上强迫场数据来对青藏高原陆面能量特征进行模拟研究.对WRF气候模型模拟的输出结果与青藏高原气象站观测数据进行比较分析表明, WRF模拟输出的气温和向下短波辐射数值与观测值的相关系数大于0.92(p >0.05), 气压和比湿的R²在0.80以上(p >0.05), 降雨和风速的模拟性能不稳定, 但WRF模拟输出的强迫场也可以作为CLM模型的驱动数据. CLM模拟的地表温度、 感热和潜热通量与青藏高原气象站观测的地表温度以及涡度通量数据验证分析表明, 虽然CLM对地表温度的模拟在合理范围内, 但模拟与观测值还是有较大偏差, 潜热和感热之间的相关系数分别为0.87和0.68(p >0.05), 表明CLM的模拟结果在单点上是可靠的.据此, 在此模拟结果基础上分析了青藏高原地区的陆面能量时空分布特征.     

民采空区危险性两级模糊综合评判——以招远市北截村为例

在充分搜集资料的基础上,对招远市北截村民采空区进行实地勘查,从地质条件、灾害发育程度及采空区特征3个影响因素入手,选取了9个评判因子进行两级模糊综合评判,采取最大隶属度原则确定采空区危险性等级,并进行了评估分区。评判结果能较准确地反应实际情况,为该区地质灾害防治工作及开发建设规划提供了依据。     

花岗岩残积土桩基施工中的问题及解决办法

文章总结了梧州市常用的沉管灌注桩、钻孔灌注桩和人工挖孔桩在以花岗岩残积土为桩基持力层时施工中的特点及容易出现的问题 ,并提出相应的解决办法     

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二次灌浆在电解槽沉降基础加固复位中的应用

广西某电解铝车间电解槽沉降基础在采用直孔帷幕灌浆加固的基础上,利用斜孔在有限空间进行二次灌浆加固复位,通过合理控制灌浆压力和灌浆量或间歇灌浆等措施,实行测量跟踪观测控制每次灌浆的抬升量,成功地将电解槽沉降基础抬升复位。     

武汉台重力长期变化分析

通过对武汉台超导重力仪９年多连续观测的重力长期变化资料分析,得到长周期重力潮汐参数、该频段气压回归因子Ｃ、极移重力效应因子Ｐ和长周期气压回归因子Ｃ１分别为：Ｃ：－０．３８３（±０．０１４）×１０－８ｍ·ｓ－２／１００Ｐａ;Ｍｍ：１．１１７３（±０．０７２０）,－１°．１７８７（±３°．６９４３）;Ｍｆ：１．１４３２（±０．０４８４）,５°．２２３５（±２°．４２５３）;Ｍｔｍ：１．２２７６（±０．２２４５）,－１７°．５６４８（±１０°．４７５８）;Ｃ１：－０．３１２（±０．０１５）×１０－８ｍ·ｓ－２／１００Ｐａ;Ｐ：１．９０４７（±０．０６９５）．重力长期变化在Ｃｈａｎｄｌｅｒ周期附近的振幅约为３．２６×１０－８ｍ·ｓ－２。