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931.
932.
933.
934.
高能级强夯处理湿陷性黄土设计施工检测应注意的问题 总被引:1,自引:0,他引:1
对3 000~15 000 kN.m高能级强夯加固湿陷性黄土的工艺进行了详细地探讨,讨论了设计、施工、检测各个环节可能存在及所需要注意问题,供类似工程优化设计和现场指导施工、检测借鉴。 相似文献
935.
Steven J. Balogh Daniel R. Engstrom James E. Almendinger Charlene McDermott Jie Hu Yabing H. Nollet Michael L. Meyer D. Kent Johnson 《Journal of Paleolimnology》2009,41(4):623-639
Sediment cores from Lake Pepin, a natural lake on the Upper Mississippi River, reveal the historical trends in trace metal
use and discharge in the watershed. Lead-210 dated concentration profiles of trace metals (Ag, Cd, Cr, Cu, Hg, Pb, V, Zn)
in sediment cores from throughout the lake generally showed low and stable concentrations prior to settlement (circa 1830),
peak concentrations between 1940 and 1975, and substantial decreases thereafter. Whole-lake sediment accumulation rates increased
greatly over the period of record, from 79,000 metric tons year−1 prior to 1830, to 876,000 metric tons year−1 during the 1990s. Whole-lake accumulation rates of most trace metals peaked in the 1960s but decreased sharply after that.
Sediment and trace metal accumulation rates decreased in the downstream direction, and approximately two-thirds of the sediment
and trace metal mass accumulated in Lake Pepin since 1800 was deposited in the upper 30% (by area) of the lake. The dramatic
declines in trace metal concentrations and accumulation rates in Lake Pepin sediments since 1970 coincide with increased pollution
control and prevention efforts throughout the watershed, including the implementation of secondary treatment at a large municipal
wastewater treatment plant upstream.
This is one of eight papers dedicated to the “Recent Environmental History of the Upper Mississippi River” published in this
special issue of the Journal of Paleolimnology. D.R. Engstrom served as guest editor of the special issue. 相似文献
936.
卓万生 《地质灾害与环境保护》2006,17(4):28-32
论述了西平公路内社段东南侧后山高边坡的地形地貌、滑坡发育特征、地质特征和成因机制分析,采用华宁岩土工程勘察软件统计,判定该滑体的稳定性,再通过传递系数法进行稳定性验算,并针对边坡的主要特征和工程实际情况,对该隐患地段的治理方案进行综合比选,提出了较为科学可行、经济合理的防治措施。 相似文献
937.
Yan XU Lei NIE Huangping DING Yin WANG Jian LIU Wei LU Zhenying ZHANG Xue GONG Shiwei SHEN 《世界地质(英文版)》2006,9(2)
On the basis of the study on the engineering geological characteristics of No.2 dump of Nanfen iron mine and the analysis of the failure mode of dump landslide, the stability of the present dump, the stability of the dump 20 years later and the stability of double-bench dump are analyzed. Then, the debris flow risk is evaluated by fuzzy mathematics method. Finally, the comprehensive treatment for the dump is suggested. It is concluded that ① In rainy and snowmelt period, the stability would be decreasing sharply when ground water is not drained out in time; ② Double-bench dumping mode will improve stability of the dump little; ③ Debris flow risk is middle danger. The interim debris flow with medium scale may occur. ④ Monitoring, draining and baffling work ought to be well done. ⑤ In order to prevent the damage of landslide and debris flow, three measures are adopted, including setting rockfall net, setting the debris flow barrier and removing the residents. 相似文献
938.
EU shipping in the dawn of managing the ballast water issue 总被引:2,自引:0,他引:2
After almost two decades of intensified research, regulatory and political activities focussed on the prevention of harmful organisms and pathogen transfers around the world in 2004 the International Convention on the Management of Ships’ Ballast Water and Sediments (BWM Convention) was adopted to provide a common and globally uniform ballast water management (BWM) approach. Nevertheless, regionally different BWM approaches are developing. By now, many countries around the world seem to be aware of the ballast water issue and its management limitations. In the EU, different approaches have been identified at regional and national scales. The first voluntary BWM requirements at the regional level have been introduced by the HELCOM and OSPAR countries, Adriatic countries have prepared a common approach considering a new legal framework for implementation, and some national level requirements have also been identified. However, a common EU wide BWM approach has not yet clearly emerged. In this paper the authors review the BWM approaches developing in Europe, and describe the EU response on BWM. The authors further provide recommendations which may be considered when developing BWM measures in the EU. This contribution focuses on the BWM issue in European seas in light of the EU Maritime Policy and EU Marine Strategy. The Caspian Sea was also considered. 相似文献
939.
Sonication of bacteria, phytoplankton and zooplankton: Application to treatment of ballast water 总被引:2,自引:0,他引:2
Holm ER Stamper DM Brizzolara RA Barnes L Deamer N Burkholder JM 《Marine pollution bulletin》2008,56(6):1201-1208
We investigated the effect of high power ultrasound, at a frequency of 19 kHz, on the survival of bacteria, phytoplankton and zooplankton, in order to obtain estimates of effective exposure times and energy densities that could be applied to design of ultrasonic treatment systems for ballast water. Efficacy of ultrasonic treatment varied with the size of the test organism. Zooplankton required only 3-9s of exposure time and 6-19 J/mL of ultrasonic energy to realize a 90% reduction in survival. In contrast, decimal reduction times for bacteria and phytoplankton ranged from 1 to 22 min, and decimal reduction energy densities from 31 to 1240 J/mL. Our results suggest that stand-alone ultrasonic treatment systems for ballast water, operating at 19-20 kHz, may be effective for planktonic organisms >100 microm in size, but smaller planktonic organisms such as phytoplankton and bacteria will require treatment by an additional or alternative system. 相似文献
940.
人与环境的和谐共处是当今社会可持续发展的重要内容,面对城市固体废弃物激增所带来的人与环境之间的各种问题,卫生填埋法作为最广泛也是最彻底的固体废弃物处理方法得到了越来越多的关注和研究。卫生填埋场的建设与环境岩土工程领域内的诸多方面密切相关,针对卫生填埋场的建设中涉及到的环境岩土工程问题,在依据已有资料概括介绍国内外相关发展现状的同时,结合西安地区的特点,在填埋场场址和类型选择、废弃物工程性质指标、填埋场防渗处理、填埋场沉降计算和边坡稳定这5个方面对西安地区城市固体废弃物卫生填埋场建设中的环境岩土工程问题进行了论述,提出了相应建议,展望了研究方向。 相似文献