垃圾填埋场衬垫系统穿刺性能评价   总被引：1，自引：0，他引：1  

许四法  张勇  王哲 《岩土力学》2011,32(6):1697-1700

垃圾中含有铁、玻璃和陶瓷等尖锐物,在荷载作用下极有可能使衬垫系统发生破坏,导致渗滤液流入地下污染周边环境,如何正确评价衬垫系统的穿刺性能很重要。考虑材料的抗拉强度、厚度以及穿刺棒的直径提出了衬垫系统穿刺力的评价公式,并与试验结果进行了比较。结果表明,单层土工膜的抗穿刺力试验结果与评价值比较吻合,但由土工膜与无纺布组成的衬垫系统抗穿刺力的试验值与评价结果有一定偏差;土工膜与无纺布一起使用能大幅度提高衬垫系统的抗穿刺能力,因此土工膜上应铺设无纺布有利于保护衬垫系统;土工膜的抗拉强度越大,抗穿刺能力越强;基础的存在能在一定程度上提高衬垫系统的抗穿刺性能。所得结果对垃圾填埋场衬垫系统的设计具有一定的指导意义  相似文献   

海洋枯草芽孢杆菌HS-A38 产直链脂肽活性物质的初步检测   总被引：1，自引：0，他引：1       下载免费PDF全文

张欢  丛丽娜  侯英敏  李爱民  谢三群  王丹 《海洋科学》2011,35(8):37-42

从海参肠道中分离得到了一株海洋枯草芽孢杆菌(Bacillus subtilis)HS-A38, 将其发酵上清液经盐酸沉淀、有机溶剂萃取得到具有广谱抗菌活性的代谢物质。采用薄层层析和茚三酮显色检测到4 种物质, 分别命名为化合物1、2、3 和4; 应用层析板覆盖指示菌的生物自显影技术对其抗菌活性成分进行追踪、检测, 结果发现化合物1 和2 具有显著抑制弧菌的作用。进一步检测分析表明, 化合物1、2和4 具有很强的热稳定性, 初步推断它们属于直链的脂肽类化合物, 并且这4 种物质出现在不同的发酵代谢时期, 这将为研究群体效应提供基础检测依据。  相似文献   

Models of compacted fine-grained soils used as mineral liner for solid waste   总被引：1，自引：0，他引：1  

Osman Sivrikaya 《Environmental Geology》2008,53(7):1585-1595

To prevent the leakage of pollutant liquids into groundwater and sublayers, the compacted fine-grained soils are commonly utilized as mineral liners or a sealing system constructed under municipal solid waste and other containment hazardous materials. This study presents the correlation equations of the compaction parameters required for construction of a mineral liner system. The determination of the characteristic compaction parameters, maximum dry unit weight (γ _dmax) and optimum water content (w _opt) requires considerable time and great effort. In this study, empirical models are described and examined to find which of the index properties correlate well with the compaction characteristics for estimating γ _dmax and w _opt of fine-grained soils at the standard compactive effort. The compaction data are correlated with different combinations of gravel content (G), sand content (S), fine-grained content (FC = clay + silt), plasticity index (I _p), liquid limit (w _L) and plastic limit (w _P) by performing multilinear regression (MLR) analyses. The obtained correlations with statistical parameters are presented and compared with the previous studies. It is found that the maximum dry unit weight and optimum water content have a considerably good correlation with plastic limit in comparison with liquid limit and plasticity index.  相似文献   

高温高压小井眼尾管固井技术应用     

林强  郑力会  崔小勃  毛丹  袁小兵  仵伟 《探矿工程》2008,35(11):24-26

高温、高压、深井、小井眼尾管固井是固井技术的一个难点,龙16井在各项配套工程技术措施综合应用的情况下施工成功,为高温、高压、深井固井作业积累了经验。龙16井是川北低平褶皱带九龙山构造上的一口预探井,[JP2]原设计2159 mm井眼钻至下二叠系完钻。由于地质条件复杂,纵向上分布多套产层并具有超高压特点,地层裂缝发育,多次出现涌漏同存复杂情况,被迫提前下入1778 mm套管固井以封隔上部复杂井段。采用1492 mm钻头钻至598800 m完钻并进行了尾管固井作业。固井作业前钻井液密度234  相似文献   

GPS及AVHRR资料在浅海潮间带测量中的应用   总被引：1，自引：0，他引：1       下载免费PDF全文

范德新  杨亚新  尹成华  汤建国 《气象》2001,27(3):19-22

通过利用GPS及渔探器实测，并进行潮位订正，获得南通浅海海域大量测点的高程资料，通过对多时相各通道NOAA卫星照片进行筛选，挑选能反映浅海地貌的通道资料，从中读取各测点相对应的灰度值，在此基础上利用分级线性回归，建立不同高程范围内的高程，灰度线性回归方程，确定不同高程的灰度阈值，从而测量出南通市浅海海域不同高程以上的潮间带面积，分布。  相似文献   

Kriging with imprecise (fuzzy) variograms. II: Application   总被引：2，自引：0，他引：2  

A. Bardossy  I. Bogardi  W. E. Kelly 《Mathematical Geology》1990,22(1):81-94

The geostatistical analysis of soil liner permeability is based on 20 measurements and imprecise prior information on nugget effect, sill, and range of the unknown variogram. Using this information, membership functions for variogram parameters are assessed and the fuzzy variogram is constructed. Both kriging estimates and estimation variances are calculated as fuzzy numbers from the fuzzy variogram and data points. Contour maps are presented, indicating values of the kriged permeability and the estimation variance corresponding to selected membership values called levels.  相似文献   

尾管悬挂器结构优选与事故预防及处理          下载免费PDF全文

郑殿富 《探矿工程》2016,43(1):27-30

尾管悬挂器是用来悬挂尾管并将尾管与上层套管相连接的装置,在尾管固井中具有重要作用。目前尾管固井日益增多,所使用的尾管悬挂器结构多种多样。在现场尾管固井实施过程中出现了环空不畅、替压过高和提前坐挂等井下复杂情况。介绍和分析了尾管悬挂器的结构、性能特点及优缺点,总结了在现场应用中易出现的事故预防及处理措施。  相似文献   

垃圾卫生填埋衬垫系统工程地质研究的若干进展与问题     

曹丽文  桑树勋  姜振泉  张静 《地球科学与环境学报》2006,28(1):96-100

总结了衬垫材料、结构、渗滤液运移规律、污染质与岩土体的耦合关系等方面的研究进展,分析了中国城市卫生填埋衬垫系统在机理研究和工程实践中存在的问题。提出了衬垫系统的工程地质研究思路,将垃圾体、衬垫作为统一的人工地质体系统,利用工程地质学理论和研究方法,研究这一人工地质体系统在渗滤液、填埋气体等作用下的工程地质规律与特征及其与天然地质体之间的矛盾协调关系。  相似文献   

Experimental study of migration of potassium ion through a two-layer soil system     

Yan Jun Du  Shigenori Hayashi  Song Yu Liu 《Environmental Geology》2005,48(8):1096-1106

A barrier system based on the hydraulic trap design concept for a landfill was proposed. To study the field scenario in which a clay liner is underlain by a granular layer functioning as a secondary leachate drain layer, a laboratory advection–diffusion test was performed to investigate factors controlling the transport of contaminants in a two-layer soil system. The soils used for this study were Ariake clay and, the underlying layer, Shirasu soil from the Kyushu region of Japan. Potassium (K⁺) was selected as the target chemical species with an initial concentration of 905 mg L⁻¹. The effective diffusion coefficients (D _e) of K⁺ for Ariake clay and Shirasu soil were back-calculated using an available computer program, Pollute V 6.3. Values of D _e derived from this experiment are consistent with previously published ones. The Ariake clay has lower D _e than the Shirasu soil. The hypothesis that mechanical dispersion can be considered negligible is reasonable based on both the observation that the predicted values well fit the experimental data and the analyses of two dimensionless parameters. Parametric analyses show that transport of K⁺ through soils is controlled by advection–diffusion rather than diffusion only, whereas at low Darcy velocity (i.e., ≤10⁻⁹ m s⁻¹), transport of K⁺ will be controlled by diffusion. Applications of the test results and parametric analysis results in practical situations were reviewed.  相似文献   

罗德里格矩阵在三维坐标转换严密解算中的应用   总被引：6，自引：0，他引：6  

姚吉利  韩保民  杨元喜 《武汉大学学报(信息科学版)》2006,31(12):1094-1097

利用反对称矩阵和罗德里格矩阵的性质，把传统的三个旋转角参数用反对称矩阵的三个独立元素代替，推导了用三个公共点计算任意旋转角情况下的7个参数的直接计算公式，井建立了相应的平差模型。  相似文献