长江九江河段河势演变及治理探讨

对九江河段历史的和近期的演变分析表明,该河段由于受来水来沙及上游河势变化的影响,深泓有一定的摆动幅度,由此引起潜洲、边滩、浅滩出现相应的冲淤变化,以致影响船舶停靠和通航.对该河段进行治理,一方面可通过挖泥疏浚来缓解目前的矛盾;另一方面,从长运考虑应实施综合治理工程来彻底根治目前九江河段存在的问题.     

TBM开挖石渣运输方式的选择

通过对国内外TBM不同石渣运输方式的技术和经济比较,确定最终的石渣运输方式。     

不同植被类型对堆积体坡面径流特性的影响

针对植被防护堆积体侵蚀动力机制的问题,通过野外模拟降雨试验,分析直根系和须根系植被对堆积体径流流速、水力和水动力参数的影响。结果表明:植被削减堆积体平均侵蚀速率达88.34%~92.88%,直根系消减平均流速效益为50.51%,须根系为21.32%~35.61%;裸坡和植被堆积体径流流型均属于层流(雷诺数<40),裸坡径流在降雨强度≤1.2 mm/min时处于急流态,直根系堆积体均处于缓流态,须根系堆积体在急流态和缓流态间变化。直根系对坡面径流的阻滞作用大于须根系;植被防护下堆积体侵蚀速率、水力和水动力参数与裸坡呈显著性差异(P<0.05),径流剪切力和径流功率可用于较好地刻画坡面侵蚀动态过程,呈显著线性关系(R²为0.63~0.96)。研究成果可为生产建设项目工程堆积体水土流失量预测模型的植被因子修订提供科学依据。     

煤矸石混合材对标准稠度影响的灰色关联分析

利用灰色关联分析的数学方法,对利用煤矸石作水泥混合材所产生的标准稠度用水量改变的影响,做了分析。论述了不同细度水泥条件下,煤矸石粒径分布范围对水泥需水量的影响。发现了在水泥较细时,在粒径范围<5 μm下的煤矸石颗粒,对标准稠度用水量影响最大;在水泥较粗时,粒径范围在5～10 μm下的煤矸石颗粒,对标准稠度用水量影响最大。     

黄土高原地区工程弃渣防护设计的几点体会

就黄土高原地区的工程弃渣防护问题 ,从渣场选择、设计洪水标准和建筑物级别、基础工作、渣场改造及土地利用、投资控制等方面进行了讨论 ,强调了渣场位置及其防护方案必须经过综合比较后确定的原则。     

Retardation of Dredged Material Leachate in Foundation Soils

Contaminated dredged material is often placed in confined disposal facilities (CDFs) designed and managed to control environmental impacts of the disposed sediment. This note presents equations for use in a screening procedure to evaluate the impact of a CDF on groundwater. The hydrologic evaluation of leachate production and quality model was used to simulate leachate production and transport through the foundation considering a range of foundation soil characteristics and contaminant properties. The model results were used to develop predictive equations of contaminant attenuation and travel time in the foundation soils. When used with equations to predict dispersion in the aquifer, contaminant exposures at receptor locations can be predicted, which is essential in leachate screening applications. The approach does not consider degradation or permanent sequestration of contaminants. Therefore, the procedure is conservative in that it may overestimate actual leachate concentrations and underestimate actual travel times.     

Field Evaluation of Crushed Glass–Dredged Material Blends

Based on the laboratory results reported in a companion paper, three crushed glass–dredged material (CG–DM) blends were prepared and evaluated in the field to explore the feasibility of using CG–DM blends in general, embankment and structural fill applications. A trailer-mounted pugmill successfully prepared 20/80, 50/50, and 80/20 CG–DM blends (dry weight percent CG content reported first) within a tolerance of ±5 dry % by weight of the targeted percentages. Blending criteria were routinely met at pugmill throughputs up to 1,500?m3/day. The constructed 20/80 CG–DM embankment was compacted to a minimum of 90% modified Proctor compaction, whereas the 50/50 and 80/20 CG–DM embankments were constructed to a minimum of 95% modified Proctor compaction. Twenty to 80% CG addition to DM resulted in 1.5–5.5?kN/m3 increases in field dry densities above 100% DM, densities not achievable with other DM stabilization techniques such as Portland cement, fly ash, and/or lime (PC/FA/lime) addition. CG substantially improved the workability of DM allowing construction with conventional equipment and three person crew while achieving very consistent and reproducible results during a timeline of frequent and heavy precipitation events. The 20/80, 50/50, and 80/20 CG–DM embankments were characterized by average cone tip resistances on the order of 1.0, 1.5, and 2.0?MPa, respectively. An environmental evaluation of 100% CG, DM and 50/50 CG–DM blend samples coupled with an economic analysis of a scaled-up commercial application illustrated that the CG–DM blending approach is potentially more cost effective than PC/FA/lime stabilization approaches. These features of CG–DM blending make the process attractive for use in urban and industrial settings.     

万家寨引黄工程渣场整治与防护

对万家寨引黄工程渣场的选址、防洪标准及整治措施进行了分析。认为:渣场选址应避开或远离大江大河;渣量大于20万m3的渣场防洪标准应定为20 a一遇,其他渣场防洪标准应定为10 a一遇;渣顶覆土应根据有关技术规范进行,土渣坡可不进行覆土,石渣坡应先覆土后种草或种植适合当地生长的柠条等;渣场施工时间应尽量选择在每年的3月下旬至6月底。     

我国第一艘大型斗轮式挖泥船的研制

江苏省亚太集团公司联合国内多家科研机构和大专院校开发的国家重大科技装备国产创新研制项目——DLC1200/500型斗轮式挖泥船,是目前我国第一艘接近国际先进水平的大型、高效清淤设备,在设计、制造及工艺等方面都有所创新,更加适合我国国情。     

广州九龙新城路网弃土场地路基建设处理方案

以九龙新城路网弃土场地路基建设为例,对路堤填土分层碾压、翻晒回填、搅拌桩直接处理填土三种路基建设方案进行了分析比较,介绍了各种处理方案的技术特点,以选择最佳的施工方案。