桥梁钻孔灌注桩超长钢护筒沉降技术

本文通过工程实例，介绍了桥梁钻孔灌注桩超长钢护筒沉降技术。     

桩端沉降测量对试桩成果分析的意义

桩端沉降测量和试桩资料的分析结果表明,桩在传递上部荷载与地基土之间产生的应力应变过程,表现为桩的弹性杆件和地基土的弹—塑性变形特征。从而对受荷桩,尤其是长柱和超长桩的应力应变特征有了更切合实际的认识。     

上海地区第⑥层暗绿色硬土层成困的探讨

以内环线工程地质勘察剖面所揭示的宏观及微观变化为主要依据,采用岩相旋迥分析法分析第⑥层 暗绿色硬土层的成因,提出了是地壳的不均匀沉降造成第⑥层埋深起伏的新观点。     

平果铝土矿洗矿泥沉降试验研究

用多种无机凝聚剂和聚丙烯酰胺系列了絮凝剂对平果铝土矿洗矿泥进行沉降试验。结果表明，阴离子型和非离子型聚丙烯酰选用于平果铝土矿洗矿泥的絮凝沉降，推荐使用分子量为６００～９００万的阴离子型或非离子型聚丙烯酰胺作为絮凝剂。     

鄂尔多斯西南缘前陆盆地沉降和沉积过程模拟

本文将东祁东逆冲带与鄂尔多斯西南缘晚三叠世前陆盆地相结合，研究了逆冲带内部变形特征，前陆盆地中层序地层格架特征及其反映的盆缘构造性质和幕式逆作作用。     

地铁二号线杨高路车站上游引水渠道保护

上海地铁２号线车站深大基坑施工采用地下连续墙围护，对邻近的重要地下构筑物保护采取优化内支撑和控制地表沉降的技术，在施工中进行监测和信息反馈。     

沉降量约束下的黄骅裂谷形成的地球的动力学模式

在计算覆盖整个黄晔裂谷２００口人工井（包括少部分探井）沉降量的基础上，总结本区二种基本沉降曲线模式。统计出热沉降（Ｓｔ）与初始沉降（Ｓｉ）之比为０．６，依此为约束条件与大陆岩石圈伸展的地球动力学正演模式进行对比，与简单剪切模式预测的热沉降与初始沉降之比值及几何效应更接近。进一步证实黄骅裂谷以简单剪切机制形成的地球动力学模式更合理，这与著名的以纯剪模式形成的北海伸展盆地不同     

拟建崇明越江通道高填土路堤稳定性评估

拟建崇明越江通道高填土路基为软土地基,地面标高低,地下水位高,工程地质条件差,需要对高填土路堤的稳定性进行评估.本文分别对5m、8m高的粉煤灰和灰土路堤进行路基抗滑稳定性分析和沉降验算.     

椒江污水处理工程超深软基真空预压加固效果综合分析

通过对椒江污水处理工程超深软基真空预压效果综合分析说明(1)真空预压由于作用机理与堆载预压不同,对深层软土的加固更加有效.(2)真空预压效果不仅与真空压力有关,还与真空泵运行的数量即单位面积真空作用功率有关.(3)对真空预压最终沉降量计算、真空压力深度衰减、深度固结滞后现象,进行了分析和探索.     

Biomarkers in the Molar Tooth （MT）-Bearing Limestones in the Jilin-Liaoning Area of China

The origin of Molar Tooth (MT) carbonates has been argued for more than 100 years, which are a kind of Proterozoic carbonates especially composed of microsparite with ptygmatically folded and sheet-like structures. Biomarkers detected in the microcalcsparite from the Wanlong and Xingmincun formations in the Jilin-Liaoning area showed there are abundant normal alkanes, isoprenoids, hopanes, steranes, alkylmethylcyclohexanes, and alkyleyclohexanes, indicating a diversity of biological source: long-chain isoprenoids, the major components of chlorophyll, such as C19, C20, a kind of major biomarkers synthesized early by isoprenoid monomers; hopanes a type of characteristic biomarkers from prokaryote, such as archaebacteria and cyanobacteria; sterane a biomarker for eukaryote; and two kinds of alkanes with C17, C18 as the main peaks representing aquatic bacteria and with C23, C24 as the main peaks representing fungi, respectively. Biomarker analysis showed that MT is the result of bacterial and algal activities, which is a kind of organisms between aerobic and anaerobic bacteria, reproducing well in normal or slightly saline sea water under weak oxidation-reduction conditions, resulting in rapid deposition of calcite as microsparite clue to some mechanisms.