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silt clay     
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  淤泥质粘土
     Based on the two typical kinds of undisturbed silt clay and silty clay in the Bohai subsea, this paper studies the essential change relationship of the clay strength characteristic under the action of vibration load and proposes the method to determine strength attenuation coefficient.
     本文针对渤海海底两种典型的原状淤泥质粘土及粉质粘土,研究了振动荷载作用下土强度特性的基本变化关系,建议了确定强度衰减系数的方法。
短句来源
     But the particularity of beach's surface commonly composing with silt and silt clay which seriously affect the stability of seawall, the reclaim the land is quite difficult.
     但是由于海涂地质形成的特殊性,涂面通常由淤泥、淤泥质粘土组成,且厚度大,这极大的影响了海塘的长期稳定和安全使用,使得围垦工程的建设难度加大。
短句来源
     Second, permeability coefficient is smaller than that of original silt clay, when the cement content is 17%, permeability coefficient is 10 times less than that of original silt clay.
     2.水泥土的渗透系数明显小于原状淤泥质粘土渗透系数,水泥掺入量为17%时,较原状粘土小一个数量级;
短句来源
     Through analyzing engineering accident of foundation pit support,it finds its causes and puts forward treating plan,it indicates design plan of foundation pit support in deep silt clay soil should be comprehensive, not only settling earth-retained problems and treating basal silt.
     通过某基坑支护工程事故分析,找出其出现事故的原因,并提出处理方案,说明在深厚淤泥质粘土中的基坑支护工程中设计方案要考虑周全,不仅要解决基坑周边的挡土问题,还要对基底淤泥进行处理。
短句来源
     When the silt clay or silty sand layer is in saturation sate and under different water discharges,engineers adopt some measures to deal with the construction problems of retaining wall,such as shorting the depth of circularly digging,backfilling flexile material,using steel sleeve and curtain grouting,finally successfully solve these construction problems.
     在淤泥质粘土、粉砂层成饱和且在不同涌水量状态下,采取缩短循环开挖深度、回填柔韧性材料、下钢套筒、帷幕注浆等多种施工方案,成功地解决了护壁施工过程中若干工程问题。
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  粉质粘土
     The Study of Long-term Performance of Silt Clay Mixed with Dredged Soil
     粉质粘土混合疏浚土的长期性能研究
短句来源
     Based on the consolidated drained tri axil compression tests in saturated Q 2 and Q 3 loess, saturated silt clay and saturated mine tailing, the relationship between stress ratio and strain increment ratio in these materials, whose bonding stress σ 0( σ 0= c .ctg φ ) is not equal to zero, is studied.
     在饱和Q2、Q3黄土、饱和粉质粘土及饱和尾矿砂固结排水三轴试验的基础上,研究了粘结力σ0(σ0=c.ctgφ)不等于零时材料的应力比与应变增量比关系。
短句来源
     Based on the two typical kinds of undisturbed silt clay and silty clay in the Bohai subsea, this paper studies the essential change relationship of the clay strength characteristic under the action of vibration load and proposes the method to determine strength attenuation coefficient.
     本文针对渤海海底两种典型的原状淤泥质粘土及粉质粘土,研究了振动荷载作用下土强度特性的基本变化关系,建议了确定强度衰减系数的方法。
短句来源
     The effects of cyclic dry-wet process on the fatigue strength of the cement silt clay and the cement silt are researched by cyclic triaxial tests.
     通过振动三轴试验,研究干湿循环过程对水泥改良粉质粘土和水泥改良粉土疲劳强度的影响。
短句来源
     Secondly, the dynamic triaxial test was carried in the laboratory to simulate the pressure of subgrade soil under 5000t, 10000t, 20000t train, and the pore pressure of silt and silty clay was analyzed. The result is that effective stress of the silt clay after 20000t train is reduced 7% than that after 5000t train.
     其次,模拟5000吨、10000吨及20000吨列车通过路基土体的受力情况,在室内进行动三轴试验,分析了粉质粘土与粉土孔隙水压变化规律,得出20000吨列车作用完后粉质粘土试样的有效应力比5000吨列车下降7%。
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  粉质黏土
     The structural degradation mechanism on frozen silt clay was studied using the experimental data obtained through dynamic triaxial stress - strain test and CT scanning test of frozen soil under different confining pressure and temperature. The characteristics of density, structure, damage degree of frozen soil, and the relation between the increment of CT number, mean square deviation and confining pressure, temperature are discussed in detail using the CT scanning results of frozen silt clay obtained before and after the dynamic triaxial test.
     基于低温动三轴试验及CT扫描试验对不同围压、负温下冻结粉质黏土的弱化机理进行了分析研究,利用冻结粉质黏土动三轴试验前、后的CT扫描试验数据与图像,定量分析了冻土的密度、结构及损伤度等方面的变化及动三轴试验前、后CT数增量、方差增量与围压、负温之间的关系。
短句来源
  粉砂粘土
     This experiment was conducted in a subsurface drained plot with silt clay soil where forage corn (Zea mays L.)
     试验田土壤为粉砂粘土 ,种植有饲料玉米 (Zea mays L .)
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      silt clay
    Metals were analyzed in the silt/clay fraction, using inductively coupled plasma - optical emission spectrometry.
          
    Susquehanna River sediments (silt/clay fraction) showed similar behavior, sorbing Cd somewhat more strongly than illite, as did mont-morillonite, while kaolinite sorbed Cd less strongly.
          
    However, elevated [CO2] increased the C:N ratios of root litter and POM in the surface 5 cm and induced a small but significant increase in the C:N ratio of the silt/clay fraction to a depth of 15 cm.
          
    Soil C and N stocks also increased under elevated [CO2], with accumulations in the silt/clay fraction over twice that of particulate organic matter (POM; >amp;gt;53 μm).
          
    subsimplex on sediment characteristics were similar to those reported for other macroalgal taxa, i.e., increased water, organic and silt/clay contents, medium particle size and sorting coefficients, and reduced redox potentials.
          
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    Comparison between damage to multi-storey brick buildings and strength of walls is made in this paper. From the evaluation of earthquake resistance for 65953 pieces of wall in 301 brick buildings, cracking resistant coefficient K_0 for areas of different intensities and collapse resistant coefficient K_(10)n for area of higher intensities are given respectively for the aseismic design. So K_0 may also be used as a quantitative measure of earthquake intensity. Meanwhile, the comparison between damage to multi-storey...

    Comparison between damage to multi-storey brick buildings and strength of walls is made in this paper. From the evaluation of earthquake resistance for 65953 pieces of wall in 301 brick buildings, cracking resistant coefficient K_0 for areas of different intensities and collapse resistant coefficient K_(10)n for area of higher intensities are given respectively for the aseismic design. So K_0 may also be used as a quantitative measure of earthquake intensity. Meanwhile, the comparison between damage to multi-storey brick buildings and their strength in Tangshan urban district reflects the effect of site conditions. Rock sites and soft soil sites with intercalation of silt clay are both favourable to such buildings.

    本文进行了震害与砖墙体强度的对比,结果表明在唐山市区,楼层平均抗震强度系数K_1大于0.25的多层砖房,一般不倒塌。文中又研究了不同烈度区砖墳体抗震强度系数的开裂临界值K_0。上述结果为多层砖房按抗裂抗倒双重没防准则进行设计提供了技术参数。文中指出K_0值亦可作为地震烈度的定量指标。文中通过对比,还反映了唐山市区的烈度异常现象。

    Due to the construction of Dan-Jiang-kou Dam and the reservoir regulation, the discharge downstream the dam has been approaching to a constant, and the sediment load has not been an independent variable any more.In this situation the effect of boundary condtitons upon the channel process is much bigger than that before the construction of the dam.Contrasting the soil mechanics properties of the bank and bed materials with the flow shear stress, the writer of this paper has established the follow-ing indices....

    Due to the construction of Dan-Jiang-kou Dam and the reservoir regulation, the discharge downstream the dam has been approaching to a constant, and the sediment load has not been an independent variable any more.In this situation the effect of boundary condtitons upon the channel process is much bigger than that before the construction of the dam.Contrasting the soil mechanics properties of the bank and bed materials with the flow shear stress, the writer of this paper has established the follow-ing indices. 1) the bank resistance index Kbank= 2) the bedresistance index K. 3 )the relative resistance index, Kr =In addition, we have proposed some other indices about boundary conditions and flow conditions .They are. 4 ) the height from the bank top to the bed,H0; 5 ) the lower floodplain restraint index, 6 ) the circulation in-tensity index, 7 ) the angle between the thalweg line and the bank,θ. In the above-mentioned indices, M is the percentage of content of silt-clay in river bank material, D the median grain diameter of bed material,m bank slope coefficient, H the average flow depth, B0 the channel width at mid-discharge, B'0 the channel width when lower floodplain is submerged, J the channel gradient, Q the water discharge,R the bend iradius and r the specificgravity of water.By multi-regression analysis between the adjusted width depth ratioθB/h and the above-mentioned indices, we have.In spite of the discharge which is flattened and does not flood the floodplain any more, there are still two process tendencies, one is that bank widening is predominant, and the other is that bed cutting-down dominates. The two tendencies depend on the boundary conditions .U sing the discrimination analysis method, we have gained a discriminating function which decides the process tendencies.Y = 0.7044-0.058ln -0.216ln - 0.176lH0 + 0.028lnθif Y>0, the channel will be mainly widened; if Y<0, the channel will be mainly cut down.It is also indicated in this paper that the manner of channel gradient regulation has been controlled by the variation of boundary conditions downstream the reservoir, and so has been the tendency that the river channel becomes more sinuous.And the corresponding quantitative relations are given in this study.

    通过野外考察和室内自然模型试验,本文探讨边界条件在水库下游再造床过程中的作用。从土壤物理力学性质与水流作用力的对比关系出发,建立了河床边界抗冲性的定量指标;采用多元回归分析的方法,建立了调整之后的河床形态与边界条件、水动力条件之间的经验方程;还运用判别分析的方法,得到了区分水库下游河床演变趋势的判别函数。

    In this paper, the adjustment of the lower channel of the yellow River and the response to the variation of the base level resulted from clear-water scouring have primarily been studied during the operation of Sanmenxia Reservoir from Septmber 1960 to October 1964.In the variable condition of the discharge and the sediment fed into the channel, the adjustment of the longitudinal profile has been explained mainly in two ways. First, the variation of the gradient in the whole lower channel and each reaches have...

    In this paper, the adjustment of the lower channel of the yellow River and the response to the variation of the base level resulted from clear-water scouring have primarily been studied during the operation of Sanmenxia Reservoir from Septmber 1960 to October 1964.In the variable condition of the discharge and the sediment fed into the channel, the adjustment of the longitudinal profile has been explained mainly in two ways. First, the variation of the gradient in the whole lower channel and each reaches have been analyzed. The gradients from Tiexie to Lijing, Tiexie to Gaocun and Gaocun to Lijing in I960 and 1964 are 1.52‰ and 1.5‰2.14‰, and 2.12‰ and 1.13‰ and 1.13‰, respectively. Secondly, the scoured depths have separately been calculated in the upper and lower reaches above and below Gaocun. It turns out that the accumulated average scoured depth is 1.51M in the whole lower channel from 1960 to 1964, and 1.52 M and 1.49M from Tiexie to Gaocun and from Caocun to Lijing respectively. It shows that the scoured depth along the channel is nearly a constant, that is, the lower Yellow River adjusted its longitudinal prifile in the approximately parallel deepening processes of the stage of clearwater scouring. The stabilities of the channel of the upper and lower reaches above and below Gaocun are slightly diffrent. This diffrence can be illustrated by Lokhtin's number of the upper and lower reaches. The Lokhtin's number of the upper reaches is small, which means that it has a big gradient. The result is that the bed material size doesn't fit the gradient of the channel. The greater gradient in the reaches is primarily relative to the deposition in the past geological process, This is why the braided channel has a greater gradient. The lower reaches below Gaocun have a greater Lokhtin number first because of the sinuosity of the channel. Secondly, the gradient becomes smaller and the bed material size is finer under the influence of the downstream extension of the river mouth.The adjustment of the cross section of the channel, particularly in the upper reaches at railroad-bridge makes the channel deeper and narrower. The change of channel patterns depends mostly upon the geomorphic threshold and the content of silt-clay in the channel material.It is rather possible that the braided channel pattern from Tiexie to Gaocun will develop into a single braided pattern because scouring causes the slope of the channel close to or less than the geomorphic threshold and also causes the roughering of the channel bed material.The principal reason of nonequilibriun of the lower channel of the Yellow River in the Long time-span is the influence of the geological and geomor-phological process and the base level. Even if some area could be under control in the future by providing with rough sediments and good consevervation of water and soil, natural erosion will be continued and is tremendously difficult to be controled because of the geological proccess in the long-time duration. Thus, the sediment fed into the Bohai sea can't be greatly reduced and the river mouth will be continuously extended toward the sea. In fact, the distributary mouth of shenxiangou was extended toward the sea by 6.25 km. during 1961-1964, about 2.08km per year, the velocity of extension was faster than that before the construction of Sanmenxia Reservoir. This proves that the effects of the base level on the upper channel still exist. From long term view, basically the aggradation behaviour of the lower channel would not change.

    本文采用黄河下游的实测资料,分析了三门峡水库下洩清水阶段,河床的调整及其对基准面的反应。认为在来水来沙条件变化的情况下,河床纵剖面以近于平行的方式调整;横断面形态向窄深式发展;河型的转化主要取决于地貌临界值和粉沙—粘土含量。从长时间看,下游的淤积特性不会发生根本性的变化。

     
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