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Firstly,by the analysis of influencing factors of settlement of loessal foundation, results indicated that among the three settlement methods such as the layer-wise summation method based on chord modulus, the layer-wise summation method based on modulus of compressibility and the layer-wise summation method based on modulus of deformation and so on, the layer-wise summation method based on chord modulus is superior to the other two methods and is very close to the actual measurement settlement of building according to the grey incidence analysis on influencing factors of settlement.

本文采用灰色系统理论中的关联分析法对黄土地基变形进行了因素关联分析,并取得一些成果。通过分析影响黄土压缩变形的因素,对于沉降变形因素的关联分析,在对影响变形的诸因素进行分析的基础上,最终证明选择了四种因素作为确定弦线模量表依据的正确性,证明了据此建立的以弦线模量为基础的变形定量分析的表达式是可行的。从关联分析以及弦线模量法的简便、直观、便于推广应用的特点来看,弦线模量法计算沉降是值得大力推广的。

Secondly, by the analysis of influencing factors of collapsibility of loessal foundation, results indicated that at the basis of the grey incidence analysis on influencing factors of collapsibility of loessal foundation,the void ratio is the superior and steadily influencing factor of collapsibility at all events and other influencing factors will have different degree of influence according to the specific conditions of loess foundation.

通过分析影响黄土湿陷性变形的因素,对于湿陷变形因素的关联分析,可以看出土性指标对湿陷性的影响程度,孔隙比的影响比较突出,基本上可以认为是在土性指标对湿陷性的影响程度中最大的,其它指标会因土质含量、黄土的类型不同而影响各异。总之,本文应用灰色系统理论的关联分析法对应用广泛的工程实用模型变形计算方法做一些因素分析、进行反思,同时证明了弦线模量法计算沉降是值得大力推广的,弦线模量法计算沉降在将来的工程实践中必将带来更为可观的社会经济效益。

For thisphenomenon,field tests are systematically conducted for loessal clay loam,settlemental-by-soaking loess,sand soil,silt soil and gravel.

针对这一现象,又系统地对黄土状亚粘土、湿陷性黄土、砂性土、淤泥及淤泥质土、砾石等进行了现场实验。

The paper discusses interaction of Cr and As with nutritional element: Ca, Mg, P and finds that Ca and Mg have decrease absorption of loessial soil to Cr and have increase to As.

初步发现钙、镁对黄土吸附Cr有减小作用,对吸附As有增大作用;Cr和As同时存在时,似乎在黄土中的吸附量有相互促进趋势。

By the infiltration test of soil column, the author concludes that Cr and As has the following migration patterns by dynamic researches. 1 The absorption and migration of Cr and As in loessial soil relate to content of mucilaginous grain.

4通过土柱淋滤试验,从动态角度研究得出铬、砷在黄土中具有以下迁移规律及特点:①Cr、As在黄土中的吸附和迁移与土壤中的粘粒含量有关。

The main distribution area of loess is also the area of macroseism,which, in the history, the big earthquake has happened and initiated the massive loess liquefication and landslide, created seriously earthquake disaster .

黄土的主要分布区也是强震的多发区,历史上曾发生过多次大地震,引发了大面积的黄土液化和滑坡,造成了严重震害。

The Holocene loess-soil sequence on the Chinese Loess Plateau constitutes an excellent record of evolution of soil formation, monsoonal climate, eolian dust accumulation and influence of arable farming of over 10000 years.

黄土高原的全新世黄土-土壤地层系列很好地记录了过去一万多年土壤发育、季风气候、风尘堆积和农业耕作影响的演变。

In order to study the finger flow phenomenon during ponded infiltration process in layered soil, an experimental study was carried out to observe the occurrence, mechanism and environment of finger flow in six soil columns which have different grain sized sands overlain by loess soil.

根据层状结构土壤在积水入渗过程中存在发生指流的现象,该文针对黄土地区&垆盖砂&的土壤条件,在室内以西安黄土为主体,对6种不同粒径的砂质双层结构土壤进行积水入渗试验,以观测研究发生指流的现象、机理与条件。

Twelve soil samp les fr om 0~20 cm soil layerwere collected from north to south in the Loess Plateau calcareous soil and analyzed for fracti onation of organic and inorganic soil phos phorus by Hedleymethod, amended by Tiessen andMoir.

:以黄土高原自北向南采集的12个0~20cm耕层土壤为供试土样,采用 Tiessen和Moir修正的Hedley土壤有机无机磷分级方法研究了黄土高原石灰性土壤中不同形态磷组分的分布特征。

Weathering crusts of which the sections are made up of 3 or 4 layers are the clay type composed of illite, smectite and ancudite.

风化壳上部是发育好的红色古土壤,中部是含铁质胶膜的风化破碎黄土,下部是不含铁质胶膜的风化破碎黄土

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