發(fā)布時(shí)間：2018-05-19 12:12

  本文選題：粉細(xì)砂土 + 壓縮模量��； 參考：《寧夏大學(xué)》2017年碩士論文

【摘要】：伴隨沿黃經(jīng)濟(jì)區(qū)及“一帶一路”建設(shè)戰(zhàn)略的實(shí)施,銀川地區(qū)經(jīng)濟(jì)快速增長(zhǎng)、城市規(guī)模不斷擴(kuò)大,一些大載荷、深基礎(chǔ)的高層建筑不斷涌現(xiàn)。以往的工程經(jīng)驗(yàn)并不能很好的滿足高層建筑建設(shè)的需求,由此引發(fā)的建筑地基沉降問題越來越引起工程技術(shù)人員的重視。本文在總結(jié)國內(nèi)外研究現(xiàn)狀的基礎(chǔ)上,圍繞著銀川地區(qū)粉細(xì)砂土的壓縮模量與標(biāo)貫擊數(shù)的相關(guān)關(guān)系、建筑地基沉降計(jì)算經(jīng)驗(yàn)系數(shù)等問題,以銀川市區(qū)多處建筑工程場(chǎng)地現(xiàn)場(chǎng)勘探為依托,結(jié)合室內(nèi)試驗(yàn)及有限元仿真分析等手段開展研究并獲得以下成果:1.為合理確定銀川地區(qū)粉細(xì)砂土的壓縮指標(biāo),依托銀川市區(qū)3處工程場(chǎng)地進(jìn)行原位取樣和標(biāo)貫試驗(yàn),根據(jù)不同深度處壓縮試驗(yàn)與標(biāo)貫試驗(yàn)數(shù)據(jù)的對(duì)比分析,建立了粉細(xì)砂地層深度Z、壓縮模量Es、標(biāo)貫擊數(shù)N三者之間的對(duì)應(yīng)關(guān)系。研究結(jié)果表明,銀川地區(qū)粉細(xì)砂土的壓縮模量Es與標(biāo)貫擊數(shù)N具有良好的線性相關(guān)性,相關(guān)系數(shù)均達(dá)0.7以上。建立壓縮模量Es與標(biāo)貫擊數(shù)N的線性回歸方程,根據(jù)銀川地區(qū)粉細(xì)砂土的標(biāo)貫擊數(shù)即可確定其壓縮模量。2.為獲得適合銀川地區(qū)的建筑地基沉降計(jì)算經(jīng)驗(yàn)系數(shù),準(zhǔn)確預(yù)測(cè)建筑物地基沉降。選取銀川地區(qū)的多處工程場(chǎng)地,采用分層總和法計(jì)算建筑地基最終沉降量,將理論計(jì)算的結(jié)果對(duì)比建筑物地基實(shí)測(cè)平均沉降量,得出沉降計(jì)算經(jīng)驗(yàn)系數(shù)Ψs,在置信度為95%的條件下,采用Bootstrap法推斷出沉降計(jì)算經(jīng)驗(yàn)系數(shù)的置信區(qū)間為[0.104,0.130]。分析結(jié)果表明,研究結(jié)果相比銀川地區(qū)工程經(jīng)驗(yàn)所取用的沉降計(jì)算經(jīng)驗(yàn)系數(shù)(Ψs=0.2),可更加準(zhǔn)確計(jì)算建筑地基沉降。3基于ADINA非線性有限元軟件對(duì)建筑地基沉降進(jìn)行數(shù)值模擬,介紹了 ADINA分析建筑物地基沉降的方法和步驟;探討了主要模型參數(shù)對(duì)計(jì)算結(jié)果的影響;對(duì)比分析了與分層總和法地基沉降計(jì)算結(jié)果的差異。分析結(jié)果表明,類似分層總和法計(jì)算結(jié)果考慮沉降經(jīng)驗(yàn)系數(shù),ADINA模擬結(jié)果修正后對(duì)比實(shí)測(cè)沉降值相差較小,可以為預(yù)測(cè)建筑物地基沉降提供參考。在置信度為95%的條件下,采用Bootstrap法推斷出對(duì)應(yīng)ADINA的沉降計(jì)算經(jīng)驗(yàn)系數(shù)的置信區(qū)間為[0.075,0.099]。論文研究明確了銀川地區(qū)粉細(xì)砂土的壓縮模量與標(biāo)貫擊數(shù)的關(guān)系,分析了銀川地區(qū)建筑地基沉降計(jì)算經(jīng)驗(yàn)系數(shù)的取值,該研究結(jié)果的獲得可為寧夏地區(qū)巖土工程勘察規(guī)范的編制提供數(shù)據(jù)積累,同時(shí)也為銀川地區(qū)廣大地質(zhì)和巖土工程設(shè)計(jì)人員提供參考和借鑒。
[Abstract]:With the implementation of the economic zone along the Yellow River and the construction strategy of "Belt and Road", the economy of Yinchuan area is growing rapidly, the scale of the city is expanding, and some high-rise buildings with large load and deep foundation are emerging. The previous engineering experience can not meet the needs of high-rise building construction, and the settlement of building foundation caused by it has been paid more and more attention by engineers and technicians. On the basis of summing up the present research situation at home and abroad, this paper focuses on the correlation between the modulus of compression of silty sand soil and the standard penetration number in Yinchuan area, the empirical coefficient of settlement calculation of building foundation, and so on. Based on the field exploration of many building engineering sites in Yinchuan city, the research was carried out by means of indoor test and finite element simulation analysis, and the following results were obtained: 1. In order to reasonably determine the compression index of silty sand soil in Yinchuan area, based on the in-situ sampling and standard penetration test of three engineering sites in Yinchuan City, the compression test and the standard penetration test data at different depths are compared and analyzed. The corresponding relationships among depth of silty sand Z, modulus of compression Esand and number of strike N are established. The results show that the modulus of compression (es) of silty sand in Yinchuan area has a good linear correlation with the standard punch number N, and the correlation coefficients are above 0.7. A linear regression equation between modulus of compression (es) and standard punch number (N) was established. The compression modulus of silty sand soil in Yinchuan area could be determined by the standard impact number of sand soil. In order to obtain the empirical coefficient of building foundation settlement which is suitable for Yinchuan area, the settlement of building foundation can be accurately predicted. The final settlement of building foundation is calculated by stratified summation method in many engineering sites in Yinchuan area. The results of theoretical calculation are compared with the measured average settlement of building foundation. Under the condition of 95% confidence, the confidence interval of empirical coefficient of settlement calculation is [0.104 ~ 0.130] by Bootstrap method. The analysis results show that compared with the calculated empirical coefficient of settlement in Yinchuan area, the settlement of building foundation can be calculated more accurately. 3. Numerical simulation of foundation settlement is carried out on the basis of ADINA nonlinear finite element software. This paper introduces the method and procedure of ADINA analysis of foundation settlement of buildings, discusses the influence of main model parameters on the calculation results, and compares and analyzes the difference between the calculation results of foundation settlement and that of stratified summation method. The analysis results show that the calculated results of the similar stratified summation method take into account the empirical coefficient of settlement and the results of Adina simulation have little difference compared with the measured settlement values, which can provide a reference for predicting the foundation settlement of buildings. Under the condition of 95% confidence, the confidence interval of empirical coefficient of settlement calculated by Bootstrap method is [0.075 鹵0.099]. In this paper, the relation between the modulus of compression and the number of standard penetration of silty sand soil in Yinchuan area is studied, and the value of empirical coefficient of settlement calculation in Yinchuan area is analyzed. The results of this study can provide data accumulation for the compilation of geotechnical engineering survey code in Ningxia area, and also provide reference for the vast number of geological and geotechnical engineering designers in Yinchuan area.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU441

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