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曹承东 《水文地质工程地质》1997,24(5):58-59,54
本文以工程实例的形式介绍了粉喷桩在黄河下游软弱冲积土层的应用,并对其适用地质条件、施工工艺及检测方法等进行探讨。 相似文献
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我国许多挡潮闸,地睛淤泥质海岸,闸下港道淤积十分严重。为了清除闸下港道淤积,提高挡潮闸的排涝能力,对耙具作了改进,经历了单面齿耙、双面齿耙、掺气耙和改进型掺气耙四个发展阶段,本文介绍清淤耙的发展过程,并对各种耙具进行了对比。拖耙清淤机具具有效率高、费用低的特点,每立方米的清淤成本仅为常规挖泥船的三分之一左右。 相似文献
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利用加水湿拌和泥浆搅拌2种方法对木质素改良黄土试样先进行均匀混合,后利用静压法在50mm×100mm圆柱形模具中两端压实制备试样,基于三轴仪对不同制样方法下改良土试样进行无侧限抗压强度试验和固结不排水三轴试验。试验结果表明:泥浆制样法获得改良土试样无侧限抗压强度值和固结不排水剪切强度值均高于加水湿拌法获得改良土试样强度值。结合扫描电镜试验对不同制样方法下改良土试样细观结构进行分析,发现对于木质素改良土,泥浆搅拌法获得的试样中木质素与黄土颗粒形成了新的胶结物和团聚物;而加水湿拌法获得试样中,木质素在土颗粒中仅起到加筋作用,未出现新的胶结物。该结果从微结构角度揭示了2种制样法制备试样的本质差异。 相似文献
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本文扼要介绍了深层搅拌法的工艺技术及适用范围,对湘北地区的工程环境条件进行了分析讨论,认为在湘北地区推广这一施工技术不仅具备工程地质条件,而且有关十分广阔的应用前景。 相似文献
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Platymonas (Tetraselmis) subcordiformis is a unicellular marine green alga. It was found to be very sensitive to the herbicide Basta through a sensitivity test indicating it could be employed as a selective agent. The bar gene is a practicable and selectable marker gene. The vector containing the expression cassette of the bar gene was transferred to P. subcordiformis by both particle bombardment and glass-bead agitation and transformants were then selected using Basta. Finally, Southern blotting analysis indicated that the bar gene had been successfully integrated into the nuclear genome of P. subcordiformis using both of the transgenic techniques, with the transformation efficiency of the glass-bead method being slightly higher than that of particle bombardment. This is the first report on stable transformation of P. subcordiformis, and will improve fundamental research and enlarge application of this alga. 相似文献
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