泥岩含量对填料物理力学性质的影响

昔格达填料是由泥岩和砂岩混合而成的一种混合料,昔格达地层本身是一种特殊的地层,由此也导致其填料的特殊性。综述了填料中泥岩含量在颗粒级配、含水量、渗透性、抗剪强度、压缩性、固结性等方面的影响,指出只要适当的控制填料中泥岩和砂岩的混合比例,昔格达填料是可以达到高速公路路基填料的要求的。     

人工降雨条件下不同坡度红壤坡面迳流泥沙变化特征研究

在人工模拟降雨强度为1.44 mm/min的条件下,研究了不同坡度(β)红壤近似裸地坡面迳流、泥沙的变化特征,研究结果表明:①地表迳流量随坡度的增大而迅速增加。②当β≤23°时,土壤侵蚀量随坡度的增大而迅速增加;当25°≤β≤40°时,土壤侵蚀量随坡度变化较小。③坡面土壤侵蚀的临界坡度则介于23°~25°之间。④坡度与侵蚀量关系可用函数表示为:S=199.1×L1.65×tan1.4β(0°≤β≤23°)。     

盾构机推力过大原因分析与应对措施

泥水加压平衡盾构机作为一种管道施工机械设备,除本身的液压、电气系统故障外,其余影响盾构推进速度的问题在参数特征上均表现为推力过大.以北江盾构穿越工程使用的M1051盾构机为例,分析了引起盾构机推力过大的人为掉物卡拖车、推进模式选择错误、粘土层糊刀、卵石层隔离刀盘、沙层固结盾尾、盾构机V形姿态的管理和工况因素,并从管理和技术两个方面提出解决措施,可为相同或相似的油气管道盾构施工提供借鉴.(图2,参5)     

Ready-to-Serve Crab Sandwich Spread in Retort Pouch: Product Development and Process Optimization

A ready-to-serve sandwich spread was developed from the meat of mud crab, Scylla serrata, by thermal processing in retortable pouches in an overpressure retort at temperatures 111.1, 116.1, and 121.1°C; and F₀ values 5, 6, and 7 min. Process optimization was done by evaluating the samples for texture, color, commercial sterility, thiobarbituric acid (TBA) value, and sensory evaluation. All samples were found to be acceptable based on these quality evaluations, and together with principal component analysis (PCA), the sample processed at 116.1°C, 6 min was found to be the best, with cook value of 84.29 and total process time of 42.59 min.     

旋挖式钻孔灌注桩施工工艺及要点

通过对旋挖式钻机的优点及施工要点、钢筋加工制作等过程的论述,阐明了桥梁基础钻孔灌注桩施工工艺。     

浅析复杂地层孔内事故的预防

通过对复杂地层的分析,提出了应对复杂地层的技术措施,不同地层要用相对应的泥浆性能指标,这样才能维持孔壁稳定,预防孔内事故的发生.     

Effects of Biochar and Marble mud on Mine Waste Properties to Reclaim Tailing Ponds

The effects of biochar addition in improving soil physical properties are not clearly understood in mining tailings. The objective of this study was to determine the effects of three different types of biochars, in addition to marble mud (MM) and their mixtures, on the structural stability and water retention of mine wastes in Cartagena, Spain. Biochars were produced at 500 °C from pig manure (PM), cotton (Gossipium hirsutum L.) crop residues (CR) and municipal solid waste (MSW). Biochars were added to the mine waste (MW) along with MM and a control (no amendments added). These mixtures were incubated in cores for 90 days (25 °C). PM and CR mixed with MM decreased soil bulk density (from 0 · 98 g cm^‐3 to 0 · 89 and 0 · 84 g cm⁻³, respectively). Amendments had no significant effect on total porosity whereas they increased gas diffusion by 100%, except for MSW. MM improved the plant available water from 0 · 59 to 2 · 56 cm as its combination with biochars, extremely relevant in water scarce climates. The micropores were likely replaced by mesopores when application of PM, CR, MM, and biochars + MM and they improved water retention. Total carbon (TC) and total nitrogen (TN) increased by using biochars and MM and no significant effects were assessed on aggregates. In general, MM mixed with PM and CR derived biochar improved the structural stability and exhibited a strong impact in reclaiming physical quality on mine tailings. Copyright © 2016 John Wiley & Sons, Ltd.     

Research of Application About Environment Dredging on River and Reservoir with Water Jet Airlift

Being established in the thought of environment dredging, the crafts flow of water jet airlift dredging and treating of surplus water as well as circle using of mud polluted have been analysed following the status in quo of pollution of the fiver and reservoir. Definitely, it has been pointed out that the total of mud will be reduced with the technique of dehydration so as to reduce the volume of mud stack. At the same ring the surplus water. The mud which had been treated can be time, it will be reduced for pollution secondly by treaused as soil of fiver or gardens or road for the recycle. Then, the parameter and efficiency of production in HuaXi river valley integration treating project have been expatiated particularly in environment dredging. It indicates the new way for environment dredging in river and reservoir at the mountainous area.     

南美白对虾混养高产养殖技术

由于池塘老化和养殖病害等因素影响,对虾养殖生产和发展受到了严重制约.作者在南美白对虾(P.vannamei)养殖生产中,通过投放一定数量的卵圆鲳鲹(Trachinotus ovatus)、锯缘青蟹[Scylla serrata(Forskal)],采取鱼、虾、蟹混养的养殖技术方法,有效的改善养殖生态环境,防止了养殖病害的发生和病害的蔓延,养殖效果得到明显提高,并在2007年的养殖生产试验中取得成功,平均产量达11062.0元/667 m2,盈利达6308.5元/667m2,取得了良好的经济效益.     

地质条件对定向钻穿越的影响与应对措施

在长输油气管道工程设计中经常遇到黄土塬、游荡性大型河流、山体等不同地形地貌,如砾砂、卵石层、溶蚀性地层等多种地层条件及其组合。针对不同地形、地貌条件,对穿越曲线设计和泥浆工艺设计进行分析,结果表明:穿越曲线设计是定向钻穿越成功的基础;结合地形、地貌,设计具有针对性的穿越曲线是实现穿越工艺方案的关键;根据定向钻穿越地层的不同地层结构岩性,设计具有针对性的泥浆配比工艺参数,可以有效降低卡钻、抱钻及回拖阻力过大等风险;定向钻穿越时,灵活应用定向钻的单边钻、对向钻、水平钻穿越组合技术手段可解决传统技术手段难以解决的问题。