Analysis of compact effect and yarn structure of compact siro spinning 緊密賽絡(luò)紡集聚效果及紗線結(jié)構(gòu)分析
Digital image analysis of gyratory compacted asphalt mixture for compacting effect evaluation 瀝青混合料旋轉(zhuǎn)壓實效果的數(shù)字圖像分析
So it is important for engineering application that compacting effects of jacked pile are effectively predicted and construction measures that can decrease the compacting effects of jacked pile are taken 因此,能有效地預(yù)估靜壓樁產(chǎn)生的擠土效應(yīng)以及采取能夠減少擠土效應(yīng)的施工措施都具有非常重要的工程意義。
Fourthly , some construction measures that are used to decease the compacting effect are analyzed by use of finite element method . and the impact of construction measures such as prebored hole and groove that prevent the compacting effect is discussed 4 、利用有限元對減少靜壓樁擠土效應(yīng)的施工措施進行了理論分析,討論了預(yù)鉆孔與防擠土槽等施工措施的防擠效果。
Application of cpt technology in the loess area , the bearing capacity of artificial composite ground is determined . moreover , the correspondence relationship between the curve feature of cpt and the compact effect of lime - mud soil compact pile is discussed 論述了靜力觸探( cpt )技術(shù)在黃土地區(qū)對人工復(fù)合地基承載力的確定,以及靜力觸探曲線特征與灰土擠密樁擠密效果的對應(yīng)關(guān)系。
Jacked pile is widely used because of its various advantages such as noiseless , vibrationless , no impact and minor construction stress . however , the obvious compacting effects caused by the penetration of jacked pile may have severe influence on surrounding engineering environment 但是,靜壓樁屬于擠土樁,其產(chǎn)生的擠土效應(yīng)會對周邊環(huán)境造成不利的影響,嚴重者可能造成鄰近的建筑物開裂,道路隆起以及地下管線斷裂等工程事故。
In this paper , depending on the enormous 356 pile testing date detailed with soil and pile parameters and p ~ s curves , covering xi ' an and adjacent areas , we analyzed the load transmission mechanism of pile in loess foundation , and proposed a kind of hyperbolic load transmission function between pile and it ' s neighboring soil . meanwhile , we created a mathematical model to predict p ~ s curve and bearing capacity of single pile . by analyzing the compacting effect caused by pile - sinking of pressed pile in loess and it ' s influence on bearing capacity and settlement , two parameters , kc and ke are introduced to modify the soil cohesive c and deformation modulus es 本文利用現(xiàn)己收集到的西安及其周邊地區(qū)356根打入樁、靜壓樁、灌注樁的現(xiàn)場試樁資料(其中打入樁67根,靜壓樁121根,鉆孔灌注樁168根,并有詳細的地層勘探資料,樁深資料,荷載沉降?曲線)對西安黃土地基中的打入樁、靜壓樁、灌注樁的荷載傳遞機理進行了分析研究,認為用雙曲線型的荷載傳遞函數(shù)模擬樁土之間的荷載傳遞函數(shù)是合適的,并用荷載傳遞分析的方法建立了計算p s曲線的數(shù)學(xué)模型及極限承載力的確定方法。
Lime - soil compaction pile is one of the most normal and effective soil improvement methods in loess area , especially in collapsible loess ones . there is few analysis and study about the compaction characteristic of soil between piles when making holes . the evaluation methods about the compacted effect between piles are different in the various standards on soil improvement 灰土擠密樁作為黃土地區(qū),特別是濕陷性黃土地區(qū)最常用、最有效的地基處理方法之一,但對樁間土在成孔過程中擠密性狀的分析和研究不是很多,在歷次規(guī)范中,對樁間土擠密效果的評價方法各不相同,也就是對樁間土中最具有代表平均擠密效果的點的選取存在差異。
The experiential formula between kc and base resistance q from cpt and , the relationship between ke and c # ( strength of concrete ) are also created by fitting 94 pressed pile testing date . based on analyzing the compacting effects caused by driving pile in loess and it ' s influence on bearing capacity and settlement , another two disturbance parameters , c and e , are proposed for multiplying respectively the parameters of soil cohesive c and deformation modulus es to reflect this effect . by fitting 51 driven pile testing date , we created an experiential formula between the e and r ( the modulus ratio between pile and surrounding soil ) , also an experiential formula between the c and base friction resistance fs / pa from cpt of pile surrounding soil 在本文中分析了靜壓樁的沉樁擠土效應(yīng)對其承載力與沉降特性的影響,在計算模型中引入了樁周土粘聚力c的修正系數(shù)k _ c和樁周土變形模量e _ s的修正系數(shù)k _ e來體現(xiàn)這種影響,通過對94根靜壓樁試樁資料進行擬合,建立了k _ c與樁端土靜力觸探的端阻q _ c之間經(jīng)驗公式以及k _ e與c # (混凝土標(biāo)號)之間的對應(yīng)關(guān)系。
The integrate expressions of large strain are deduced by means of spm . and the difference of the soil compacting effects in the condition of large strain and small strain is analyzed . secondly , according to the analytical expressions of single jacked pile , the displacement fields of subsequent jacked pile due to the presence of adjacent pile are obtained 2 、在得到靜壓單樁擠土產(chǎn)生位移場的基礎(chǔ)上,運用拉格朗日插值法得到了已存在樁的情況下壓樁產(chǎn)生的土體位移場,并推導(dǎo)了二樁,排樁及靜壓群樁施工產(chǎn)生的迎樁面及背樁面位移場的解析式。