本文關(guān)鍵詞： 群樁基礎(chǔ) 沉降計(jì)算 改進(jìn)方法 有限元 蠕變　出處：《武漢理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國交通需求量的急速增加，大力發(fā)展高速鐵路已成為我國當(dāng)前的一項(xiàng)重大任務(wù)。高速鐵路對基礎(chǔ)處沉降控制非常嚴(yán)格，而我國高速鐵路中橋梁路段占了相當(dāng)大的比重，因此橋梁群樁基礎(chǔ)的沉降計(jì)算的研究對高鐵的建設(shè)有著重大的意義。它不僅是橋梁設(shè)計(jì)與施工的重要參考依據(jù)，同時(shí)也是確保高鐵安全運(yùn)營的重要指標(biāo)。傳統(tǒng)的群樁沉降計(jì)算方法很多，但這些理論大都不夠精確，主要是因?yàn)樗鼈兇嬖谝韵乱恍﹩栴}：（1）未考慮群樁側(cè)面土的總剪切力的影響，對深、淺基礎(chǔ)采取一樣的方法計(jì)算；（2）未考慮樁間土的壓縮變形，與實(shí)際情況不相符合；（3）未考慮地基的蠕變變形引起的沉降，使得計(jì)算結(jié)果不準(zhǔn)確。 本文針對以上問題，在以成渝高鐵中鄧家灣雙線大橋5號和21號橋墩群樁基礎(chǔ)實(shí)際測量數(shù)據(jù)為參考的基礎(chǔ)上，做了如下工作：對傳統(tǒng)群樁測量方法中的等代墩基法進(jìn)行了修正，在計(jì)算中不僅考慮到了樁長范圍內(nèi)側(cè)面土層的總抗剪力，同時(shí)也考慮了該范圍內(nèi)土的壓縮量，得到了改進(jìn)等代墩基法，并用以計(jì)算群樁基礎(chǔ)沉降；然后利用ANSYS有限元軟件中接觸模型對群樁基礎(chǔ)進(jìn)行了模擬；最后，在ANSYS模型計(jì)算結(jié)果的基礎(chǔ)上，對地基的蠕變沉降予以建模計(jì)算，并得出了考慮蠕變沉降的樁基沉降結(jié)果。 研究結(jié)果表明：（1）改進(jìn)的等代墩基法相對于傳統(tǒng)的等代墩基法，考慮更加全面，能更準(zhǔn)確的計(jì)算出群樁基礎(chǔ)沉降，但是仍與實(shí)測數(shù)據(jù)存在一定的差異；（2）未考慮地基蠕變變形的ANSYS建模方法能較好模擬群樁沉降，，計(jì)算結(jié)果與實(shí)測值較為接近，但不夠精確，說明在準(zhǔn)確計(jì)算橋梁群樁基礎(chǔ)沉降時(shí)，需對地基的蠕變變形予以考慮；（3）考慮地基蠕變變形的ANSYS建模能更準(zhǔn)確模擬群樁沉降計(jì)算，其計(jì)算精度能夠達(dá)到95%左右。（4）改進(jìn)等待墩基法及ANSYS模擬群樁沉降計(jì)算方法對工程計(jì)算有一定的參考價(jià)值。
[Abstract]:With the rapid increase of traffic demand in China, the development of high-speed railway has become a major task at present in China. High-speed railway is very strict to control the settlement of the foundation. In our country, the bridge section accounts for a large proportion of the high-speed railway, so the settlement calculation of bridge pile group foundation is of great significance to the construction of high-speed rail, it is not only an important reference for bridge design and construction. At the same time, it is also an important index to ensure the safe operation of high-speed railway. There are many traditional calculation methods of pile group settlement, but most of these theories are not accurate enough. The main reason is that they have the following problems: 1) not taking into account the influence of the total shear force of the soil on the side of the pile group, and using the same method to calculate the depth and shallow foundation; (2) the compression deformation of soil between piles is not in accordance with the actual situation; 3) the settlement caused by creep deformation of foundation is not taken into account, which makes the calculation result inaccurate. In view of the above problems, based on the actual survey data of pile group foundation of No. 5 and 21 piers of Dengjiawan double-track bridge in Chengdu-Chongqing high-speed railway, the paper takes as the reference data. The following work has been done: the method of equivalent pier foundation in the traditional pile group survey method has been modified. In the calculation, not only the total shear resistance of the lateral soil layer in the pile length range is taken into account, but also the compressibility of the soil in this range is considered. The improved equal-substitute pier foundation method is obtained and used to calculate the settlement of pile group foundation. Then the contact model of ANSYS finite element software is used to simulate the pile group foundation. Finally, based on the results of ANSYS model, the creep settlement of foundation is modeled and calculated, and the settlement results of pile foundation considering creep settlement are obtained. The results show that the improved method is more comprehensive and can calculate the settlement of pile group foundation more accurately than the traditional method, but there is still some difference with the measured data. 2) the ANSYS modeling method without considering the creep deformation of foundation can simulate the settlement of pile group better, and the calculated result is close to the measured value, but it is not accurate enough, which shows that the settlement of pile group foundation of bridge is calculated accurately. The creep deformation of the foundation should be considered. (3) the ANSYS model considering the creep deformation of foundation can simulate the settlement of pile group more accurately. The accuracy of the method can reach about 95%) the improved method of waiting pier foundation and the method of simulating pile group settlement by ANSYS have certain reference value for engineering calculation.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.15

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