Simulation research on the influence of eroded primary key strata on dynamic strata pressure of shallow coal seams in gully terrain

In Huojitu Coal Mine of Shendong mining area,the dynamic strata pressure (DSP) accidents occurred when the working faces passed the gully terrain,Focusing on this problem,we used physical simulation ex...     

新型高分子材料在深溪沟电站泄洪冲沙闸补强修复工程中的应用

深溪沟电站工程泄洪冲沙闸工程经过两年的运行,因多种原因冲损较严重。本文简述了多种新型高分子材料在泄洪冲沙闸补强修复工程的主要施工方法,可为类似工程提供技术参考。     

城市雨水口设计的探讨

在城市雨水排放系统中,设置合理的雨水口可以使雨水迅速排入雨水管网,避免积水产生。分别从雨水口的位置和长直路面雨水口设置间距2个方面介绍了城市雨水口的设置。     

Design comparison of experimental storm water detention systems treating concentrated road runoff

The aim was to assess the treatment efficiencies of experimental storm water detention (extended storage) systems based on the Atlantis Water Management Limited detention cells receiving concentrated runoff that has been primarily treated by filtration with different inert aggregates. Randomly collected gully pot liquor was used in stead of road runoff. To test for a 'worst case scenario', the experimental system received higher volumes and pollutant concentrations in comparison to real detention systems under real (frequently longer but diluted) runoff events. Gravel (6 and 20 mm), sand (1.5 mm), Ecosoil (inert 2 mm aggregate provided by Atlantis Water Management Limited), block paving and turf were tested in terms of their influence on the water quality. Concentrations of five-day at 20 degrees C ATU biochemical oxygen demand (BOD) in contrast to suspended solids (SS) were frequently reduced to below international secondary wastewater treatment standards. The denitrification process was not completed. This resulted in higher outflow than inflow nitrate-nitrogen concentrations. An analysis of variance indicated that some systems were similar in terms of most of their treatment performance variables including BOD and SS. It follows that there is no advantage in using additional aggregates with high adsorption capacities in the primary treatment stage.     

九寨沟熊猫海左岸泥石流震后发育特征研究

泥石流是山区高频率发生的地质灾害,九寨沟熊猫海左岸泥石流的发生给景区造成巨大的损失。在现场调查的基础上,通过现场实验及理论公式计算了泥石流的容重、峰值流量、平均流速,并对九寨沟熊猫海左岸泥石流的形成机理进行了分析研究。通过Massflow软件对九寨沟熊猫海左岸泥石流的运动特征进行了模拟计算,结合目前沟道物源、水源、地形地貌等条件进行分析,根据分析结果判断出：该沟道再次发生更大规模泥石流的可能性极大,并提出针对该沟道泥石流的两种治理措施。     

大口径管道穿越复杂岩土层的方案设计

本文主要结合工程实例,介绍管道长距离穿越复杂岩、土层的敷设方案,尤其是穿越岩、土互换土层情况下的设计方案,可供类似工程设计参考。     

贡嘎山森林小流域水文特性探索

利用一个森林小流域的水文、气象资料,通过确定性水文模拟方法,探索了该地区的水文特性。通过分析,发现该流域水资源十分丰富,河川径流变化平缓,有利于综合开发利用。并提出了林冠能截留大量降水,森林土壤能贮蓄大量水分、调节径流成分并能消减洪峰,坦化出流过程的结论。     

Relationship between small dam efficiency and gully erodibility of the lithologic formations covering their watershed

Soil conservation strategy in the semi-arid areas of central Tunisia has focused on the construction of numerous hill reservoirs. However, limited rainfall combined with severe soil erosion is jeopardizing the usefulness of hill reservoirs such that there is an urgent need to undertake further studies into the location and efficiency of small dams. The paper reports investigations into the relationship between location of the dam and the underlying lithology of the catchment areas with the dam efficiency. A gully erodibility factor has been proposed for nine groups of lithological formations identified and a watershed lithologic number was computed as the product of seven watersheds for which 1:50,000 scale lithological maps were available. A significant linear relationship was determined between the watershed lithologic number and the efficiency of the small dams, indicating that an accurate lithological survey prior to small dam planning can be used to indicate the dam's likely efficiency and to plan any necessary soil and water conservation works in the catchment areas.     

汶川强震区“8·20”登溪沟泥石流发育特征与致灾机理研究

登溪沟是汶川强震区“8·20”泥石流事件中典型的由暴雨诱发的大型灾害性泥石流,其泥石流持续时间达3 h,堆积长度达3.4 km,受沟道地形的放大效应影响,峰值流量达407.54 m³/s。形成四个典型的灾难链。给沟口建筑、居民、公路及岷江上下游都带来了严重影响。地震为登溪沟泥石流提供了充足的物源,当持续性强降雨超过了研究区的阈值之后,泥石流就会起动,在运动过程中不断带走沿途沟道内的固体物质,最终发展为灾害性泥石流。笔者在现场充分调查的基础上,结合遥感卫星影像,从地震、降雨、物源和沟道侵蚀等方面揭示了登溪沟泥石流的形成和发展过程,并提出“以拦固为主,排导为辅”的治理思路,可作为强震区泥石流防治工程的参考。     

柳树沟水电站厂房上部钢管柱混凝土施工

新疆柳树沟水电站厂房发电机层以上采用钢管砼柱取代原来的钢筋砼排架柱，减少了砼的等强时间，将后续的桥机梁吊装和为机组安装创造了条件，为总工期规划提供了可以进行宏观决策的现实依据。