陷落柱中“止水塞”的快速建立技术

论述了通过注浆在特大型垂向导水通道——陷落柱中建立人工\     

柔度法纤维模型在方钢管混凝土柱滞回仿真中的应用

本文编制了基于二阶柔度法纤维模型梁柱单元的矩形钢管混凝土框架结构非线性分析程序,采用虚拟阶步法和改进的滞回路径追踪方法消除了其中截面切线刚度矩阵奇异时无法求逆的隐患,提高了算法的稳定性.运用此程序对矩形钢管混凝土柱进行滞回仿真,并与试验结果对比,结果表明:柔度法纤维模型梁柱单元可以有效解决框架结构的几何非线性问题和压弯耦合的材料非线性问题,使用较少的单元数量就可以得到较准确的计算结果;本文所采用的改进措施切实有效,保证了程序的稳定性.     

沿高度变刚度复合墙板结构弹塑性分析

本文研究沿高度变刚度混凝土灌芯纤维石膏墙板结构(以下简称复合墙板结构)在水平荷载作用下的受力机理,建立简化计算模型,推导出了复合墙板结构的受力破坏路径,并建立了各阶段内力计算方法及计算公式。通过实例计算,得到沿高度均匀结构以及非均匀结构在水平荷载情况作用下位移的曲线与非均匀结构的受力破坏路径。结果表明,沿高度适当改变灌芯方式,侧移曲线更趋合理;各区段结构破坏路径均是石膏板先开裂且先达到极限状态。     

三维地震勘探在晋煤集团成庄矿的应用分析

晋煤集团成庄矿位于沁水煤田南部,区内大部分基岩裸露,少部分黄土覆盖,地形以中、低山、丘陵为主,相对高差436．4m,区内村庄较多,地震测量和野外采集难度较大。区内的黄土覆盖区与坡积物区成孔困难,激发条件差。矿区地层较为平缓,煤系地层较稳定,主采煤层及标志层全区基本上可连续追踪对比。成庄矿共施工三维地震勘探面积51．648km^2,解释陷落柱为165个,断层66条,现已验证4个盘区内9个工作面,验证面积达4．68km^2,准确率平均为50％。通过探采对比,证明勘探边界、陷落柱大小、断距落差及长度以及地形条件等因素都会影响到勘探精度。     

Calcium Isotopic Fractionation during Ion‐Exchange Column Chemistry and Thermal Ionisation Mass Spectrometry (TIMS) Determination

Significant isotopic fractionation can occur during column chemistry and determination by mass spectrometry. Improper correction may produce uncertainties in the isotopic composition of geological samples. We investigated calcium isotopic fractionation during these two processes and set up a model to check data quality. The δ^44/40Ca_915a value of IAPSO seawater in different Ca cuts (e.g., 0–20, 20–40, 40–60, 60–80 and 80–100%) on column chemistry ranged from ~ 4‰ to 0‰. The more Ca was eluted, the lower the δ^44/40Ca_915a value of the elution was found. The isotopic fractionation of calcium on the column appeared to follow the exponential law. However, TIMS instrumental fractionation during Ca runs did not always follow the exponential law due to mixing effects from sample reservoirs on the filament. Our results show that errors could be caused if the instrumental fractionation deviates from the exponential law, especially when the fractionation degree is large. To improve the measurement uncertainty, a model is proposed to check the behaviour and degree of instrumental fractionation, which will provide a quick and reasonable verdict on the data quality of TIMS runs.     

Effect of fibre inclusion on dynamic properties of clay

One of the causes of heavy damage due to earthquake motions is the role of soft clay in amplifying bedrock ground motions. Improving the soil conditions using polypropylene fibres at a site in order to mitigate earthquake damage could be one of the methods to modify site conditions. In this study, the optimum fibre contents were obtained for mixtures of clay with two different types of fibre. Then the dynamic properties of polypropylene fibre reinforced clay with different fibre contents were determined using resonant column testing. The study showed that the inclusion of fibre at optimum fibre content can improve the dynamic properties of clay at the low shear strains used. Test results indicated that both the shear modulus and damping increased. Hence, the inclusion of fibre in clay can provide a double benefit for the dynamic response of a site by increasing the stiffness of the site and reducing its amplitude of vibration.     

岸式波力发电装置水动力性能试验研究

通过模型试验研究,得到海岸岸坡、气室宽度与频率响应和吸能效率之间的关系和规律,验证了一种理论计算方法的可靠性,证明该计算方法对波能电站的设计和工程选址有一定的参考价值。     

Analytical and experimental investigation on the hydrodynamic performance of onshore wave-power devices

The hydrodynamic performance of the oscillating water column type shoreline-mounted wave-power device is numerically studied within linear wave theory by using a boundary element method based on the Wehausen and Laitone 3D shallow water Green's function. In order to verify the numerical model, a 1:12 physical model with different bottom slopes was constructed and tested in a wave basin under regular wave conditions. The effects of the bottom slope on the hydrodynamic performance are investigated by both analytical and experimental methods.     

两种不同凝胶柱测定壳聚糖分子量结果的比较

凝胶渗透色谱法测定壳聚糖分子量 ,以葡聚糖为标准品 ,用 2种不同的凝胶柱 (PLaquagel- OH柱和 TSK G4 0 0 0 PWXL柱 )测定 4种样品的分子量及其分布 ,并经过普适标定。比较结果发现 :PL aquagel- OH柱效果稍好于 TSK G4 0 0 0 PWXL柱。两柱所得重均分子量平均偏差为 0 .17%～ 3.38% ,数均分子量的平均偏差为 0 .90 %～ 3.5 7% ,分子量分布宽度指数 1.34～ 1.5 4。