本文關(guān)鍵詞： 膨脹土 橋梁樁 單樁靜載試驗(yàn) 單樁承載力 計(jì)算參數(shù)　出處：《河北工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：膨脹土是一種具有濕脹干縮性質(zhì)的特殊的粘性土，由于膨脹土的特殊工程性質(zhì)使得樁與膨脹土之間的相互作用要比一般土中復(fù)雜得多，計(jì)算其單樁承載力時(shí)也應(yīng)對其特殊性加以考慮，，計(jì)算膨脹土地區(qū)的單樁豎向承載力時(shí)若直接采用《公路橋涵地基與基礎(chǔ)設(shè)計(jì)規(guī)范》和《建筑樁基技術(shù)規(guī)范》中給出的計(jì)算方法，得出的承載力與實(shí)際的樁基礎(chǔ)承載力有很大的差距，不能滿足要求。因此，對膨脹土中樁側(cè)摩阻力的分布規(guī)律研究對確定膨脹土中橋梁樁的承載力計(jì)算參數(shù)具有重要意義。 本文以河北省交通運(yùn)輸廳立項(xiàng)的重點(diǎn)科研項(xiàng)目為依托，以國內(nèi)外巖土工程界對膨脹土中樁基礎(chǔ)研究成果為參考，通過室內(nèi)物理力學(xué)性質(zhì)試驗(yàn)、單樁靜載荷試驗(yàn)、軸力測試和樁側(cè)摩阻力計(jì)算分析，取得了如下研究成果： （1）以南水北調(diào)總干渠跨線橋邯鄲市郭河生產(chǎn)橋附近的膨脹土為研究對象，在國家規(guī)范和本試驗(yàn)相關(guān)研究資料的基礎(chǔ)上，通過大量的室內(nèi)試驗(yàn)，分析了膨脹土的物理力學(xué)特性和脹縮特性； （2）對橋梁樁基礎(chǔ)的受力原理、承載性狀進(jìn)行了分析，找到了影響樁基豎向承載力的因素，對現(xiàn)在普遍采用橋梁樁承載力的計(jì)算方法進(jìn)行了歸納總結(jié)； （3）對南水北調(diào)邯鄲段郭和橋南側(cè)膨脹土地基上的三根試驗(yàn)樁進(jìn)行了靜載荷試驗(yàn)，根據(jù)曲線圖確定了單樁極限承載力和承載力標(biāo)準(zhǔn)值，研究了樁身軸力和樁側(cè)摩阻力的大小和沿樁身的分布規(guī)律； （4）通過分析樁側(cè)土樣的物理力學(xué)指標(biāo)在樁身深度范圍內(nèi)的變化規(guī)律，找到了其與樁側(cè)摩阻力變化規(guī)律之間的內(nèi)在聯(lián)系，分析了樁側(cè)摩阻力的影響因素； （5）通過采用不同的計(jì)算參數(shù)對單樁承載力的標(biāo)準(zhǔn)值進(jìn)行計(jì)算，得到了較為合理的單樁承載力的計(jì)算參數(shù)。
[Abstract]:Expansive soil is a kind of special clay soil with the property of wet expansion and shrinkage. The interaction between pile and expansive soil is much more complicated than that in general soil because of the special engineering properties of expansive soil. The particularity should also be taken into account when calculating the bearing capacity of single pile. When calculating the vertical bearing capacity of single pile in expansive soil area, the calculation method given in "Design Code for Highway Bridge and culvert Foundation" and "Technical Specification for Building pile Foundation" is adopted directly. There is a big gap between the bearing capacity and the actual bearing capacity of pile foundation, which can not meet the requirements. It is of great significance to study the distribution of lateral friction of pile in expansive soil to determine the bearing capacity parameters of bridge pile in expansive soil. In this paper, based on the key scientific research projects of Hebei Provincial Communications and Transportation Department, and taking the research results of pile foundation in expansive soil as a reference, the physical and mechanical properties of the soil are tested in the laboratory in the field of geotechnical engineering at home and abroad. Single pile static load test, axial force test and pile side friction calculation and analysis, obtained the following research results: 1) taking the expansive soil near the production bridge of Guo River in Handan City as the research object, a large number of indoor tests were carried out on the basis of the national code and the relevant research data of this test. The physical and mechanical properties and dilatation characteristics of expansive soil are analyzed. (2) the paper analyzes the stress principle and bearing behavior of bridge pile foundation, finds out the factors that influence the vertical bearing capacity of pile foundation, and sums up the calculation method of bridge pile bearing capacity. The static load test of three test piles on the expansive soil foundation of Guohe Bridge in Handan section of South-to-North Water transfer Project is carried out, and the ultimate bearing capacity and bearing capacity standard value of single pile are determined according to the curve diagram. In this paper, the axial force of pile body, the magnitude of pile side friction and the distribution law along pile body are studied. 4) through the analysis of the variation law of the physical and mechanical indexes of the soil samples on the pile side in the depth range of the pile body, the inherent relation between the variation law of the pile side friction and the pile side friction is found, and the influencing factors of the pile side friction are analyzed. 5) by using different calculation parameters to calculate the standard value of the bearing capacity of a single pile, a reasonable calculation parameter of the bearing capacity of a single pile is obtained.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.15

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 肖宏彬;張春順;何杰;王永和;;南寧膨脹土變形時(shí)程性研究[J];鐵道科學(xué)與工程學(xué)報(bào);2005年06期

2 蔡江東;姜振泉;;大直徑軟巖嵌巖樁側(cè)阻發(fā)揮系數(shù)取值分析[J];工程勘察;2006年02期

3 楊和平,鄭健龍,宋蔚濤,郭天龍;土工格網(wǎng)用于膨脹土路堤邊坡加固的探討[J];公路;1999年03期

4 邢忠信,劉增壽,周海軍;南水北調(diào)中線河北段膨脹土特性及改性試驗(yàn)研究[J];華北地質(zhì)礦產(chǎn)雜志;1999年02期

5 陸忠偉;;膨脹土地基中樁的設(shè)計(jì)與計(jì)算[J];建筑結(jié)構(gòu);1992年02期

6 陸忠偉;膨脹土中群樁的工作特性[J];建筑科學(xué);2000年02期

7 于長明;淺談膨脹土對公路施工的危害[J];內(nèi)蒙古公路與運(yùn)輸;1997年04期

8 惠會(huì)清;胡同康;王新東;;石灰、粉煤灰改良膨脹土性質(zhì)機(jī)理[J];長安大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年02期

9 高忠,熊仲明;膨脹土中樁的脹切力計(jì)算研究[J];西安建筑科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2003年04期

10 許瑛,雷勝友;影響有荷載膨脹率的因素分析[J];西北建筑工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2003年02期

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