本文關(guān)鍵詞： 水泥土 半剛性樁 復(fù)合地基 本構(gòu)模型 極限承載力　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：水泥土、灰土樁復(fù)合地基技術(shù)在西北地區(qū)被廣泛的應(yīng)用于提高地基承載力以及消除濕陷性,為了達(dá)到更加經(jīng)濟(jì)、節(jié)約資源的效果,許多外摻劑也被應(yīng)用到了水泥土和灰土中來(lái),用以提高其強(qiáng)度。加了各種外摻劑的水泥土和灰土填料強(qiáng)度一定程度上得到的提高。本文以在1:6水泥土中摻入不同含量石灰為外摻劑為例進(jìn)行了為期7個(gè)月的室內(nèi)試驗(yàn),發(fā)現(xiàn)適量石灰可以提高水泥土的無(wú)側(cè)限抗壓強(qiáng)度、抗剪強(qiáng)度、黏聚力和彈性模量等參數(shù);而過(guò)量的石灰則會(huì)抑制水泥土的無(wú)側(cè)限抗壓強(qiáng)度,但對(duì)其他參數(shù)的影響不大,對(duì)實(shí)際工程有重要的借鑒意義。同時(shí),基于室內(nèi)無(wú)側(cè)限抗壓強(qiáng)度試驗(yàn)的應(yīng)力-應(yīng)變曲線特點(diǎn),推導(dǎo)出了加了少量石灰的水泥土的損傷本構(gòu)方程和損傷演化方程,結(jié)合已有的研究成果得出該損傷本構(gòu)模型和損傷演化方程還適用于水泥黃土和加了少量水泥的灰土。經(jīng)驗(yàn)證,該公式計(jì)算結(jié)果與室內(nèi)試驗(yàn)應(yīng)力-應(yīng)變曲線較為吻合,且該公式參數(shù)較少且容易獲取,計(jì)算簡(jiǎn)便�；趽p傷理論和樁體的損傷本構(gòu)模型,修正了半剛性樁復(fù)合地基沉降計(jì)算公式,并運(yùn)用該公式對(duì)已建成的西安大華公園世家9#地塊1#樓的復(fù)合地基在不同荷載下的沉降量進(jìn)行了計(jì)算,將計(jì)算結(jié)果與規(guī)范算法計(jì)算結(jié)果繪制成p-s曲線圖,分析了該復(fù)合地基的承載能力,得出修正后的算法比規(guī)范算法計(jì)算結(jié)果精度提高了 13%。同時(shí)用FLAC3D對(duì)不同填料的半剛性樁復(fù)合地基的極限承載力進(jìn)行了模擬,得到了其可能達(dá)到的最大承載力,對(duì)實(shí)際工程有一定的指導(dǎo)意義。
[Abstract]:The technology of cement soil, lime soil pile composite foundation is widely used in Northwest China to improve the bearing capacity of foundation and eliminate collapsibility. In order to achieve more economical and save resources effect, many admixtures have also been applied to cement soil and lime soil. In order to improve its strength, the strength of cement soil and lime soil filler with various admixtures has been improved to a certain extent. In this paper, the laboratory test was carried out for 7 months with the addition of different contents of lime as the admixture in 1: 6 cement soil. It is found that proper amount of lime can increase the unconfined compressive strength, shear strength, cohesion and elastic modulus of cement soil, while excess lime can inhibit the unconfined compressive strength of cement soil, but has little effect on other parameters. At the same time, based on the characteristics of stress-strain curve of unconfined compressive strength test in laboratory, the damage constitutive equation and damage evolution equation of cement soil with a small amount of lime are derived. Combined with the existing research results, the damage constitutive model and damage evolution equation are also suitable for cement loess and lime-soil with a small amount of cement. It is verified that the calculated results are in good agreement with the stress-strain curves of laboratory tests. Based on the damage theory and the damage constitutive model of the pile, the formula for calculating the settlement of semi-rigid pile composite foundation is modified. Using the formula, the settlement of the composite foundation of the Xianghua Park Shijia9# block of Xi'an Dahua Park under different loads is calculated, and the calculated results and the calculated results of the specification algorithm are plotted into a p-s curve. The bearing capacity of the composite foundation is analyzed, and it is concluded that the accuracy of the modified algorithm is 13% higher than that of the standard algorithm. At the same time, the ultimate bearing capacity of semi-rigid pile composite foundation with different fillers is simulated by FLAC3D. The maximum bearing capacity can be obtained, which has certain guiding significance for practical engineering.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU470

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