本文關(guān)鍵詞：飽和粘土地基中粘附強(qiáng)度試驗(yàn)研究　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 飽和粘土 粘附力 速率 含水率 接觸面 負(fù)孔壓

【摘要】：近年來抗拔基礎(chǔ)作為上部結(jié)構(gòu)的錨固形式被廣泛應(yīng)用,在粘土地基結(jié)構(gòu)物起浮或上拔過程中,不可避免要承受粘性底質(zhì)對(duì)基礎(chǔ)的粘附作用,且粘附強(qiáng)度決定了抗拔結(jié)構(gòu)物穩(wěn)定性及吊裝設(shè)備選擇。例如承受上拔荷載的樁基、桶基等,這些基礎(chǔ)的抗拔承載力是結(jié)構(gòu)物穩(wěn)定重要保障;另一方面,在拔樁、沉船打撈等工程中,結(jié)構(gòu)的抗拔承載力是需要克服的阻力。然而,目前對(duì)粘附強(qiáng)度還缺乏系統(tǒng)研究,因此有必要對(duì)土與結(jié)構(gòu)物間粘附特性進(jìn)行研究。本文利用自制組合測(cè)盤進(jìn)行了室內(nèi)粘附力試驗(yàn),在此基礎(chǔ)上通過單體船模型試驗(yàn)及其數(shù)值模擬分析取得了如下結(jié)論和成果:(1)室內(nèi)粘附力試驗(yàn)表明:相同含水率下,基礎(chǔ)與土體脫離時(shí)所對(duì)應(yīng)的土體位移隨拉拔速率增加保持不變,基礎(chǔ)與土體間的粘附強(qiáng)度隨拉拔速率的增加呈“S型曲線”變化;相同拉拔速率下,基礎(chǔ)與土體脫離時(shí)所對(duì)應(yīng)的土體位移隨含水率增加先增大至某一峰值而后逐漸減小,粘附強(qiáng)度隨含水率增加呈單峰曲線變化,且峰值點(diǎn)所對(duì)應(yīng)的粘附強(qiáng)度隨速率增加而增大,對(duì)應(yīng)的含水率隨之而降低。(2)用不排水強(qiáng)度標(biāo)準(zhǔn)化后的粘附強(qiáng)度隨含水率增加單調(diào)遞增,表明土與結(jié)構(gòu)物間的粘附強(qiáng)度與土體黏聚力是有區(qū)別的。(3)基于單體船模型試驗(yàn),建立三維軟粘土地基中結(jié)構(gòu)物拉拔計(jì)算模型。計(jì)算模型采用Mises屈服準(zhǔn)則,并考慮土與結(jié)構(gòu)物之間采用粘聚模型。有限元實(shí)例分析表明,拉拔過程中孔壓變化規(guī)律與試驗(yàn)值比較吻合,驗(yàn)證了粘聚模型能較好地反映土與結(jié)構(gòu)物間接觸面變形特性。(4)通過有限元實(shí)例分析表明:土與結(jié)構(gòu)物間的粘附特性是拉拔過程中土體負(fù)孔壓發(fā)展的重要影響因素,也影響土體對(duì)結(jié)構(gòu)物吸附力的大小。
[Abstract]:In recent years, as the foundation of uplift anchor form upper structure is widely used in clay foundation structure floating or uplift process, inevitably bear the viscous bottom on the basis of the adhesion, and the adhesion strength determines the uplift structure and stability of hoisting equipment. For example under pile pulling load, bucket based on these, the foundation uplift capacity is an important guarantee for structure stability; on the other hand, in the pile, salvage and other projects, the structure of anti pulling force is required to overcome the resistance. However, the adhesion strength is still lack of systematic research, it is necessary to study soil structure the adhesion characteristics were measured. The self-made combined disc indoor adhesion test in this paper, on the basis of the tests of single ship model and its numerical simulation analysis yielded the following conclusions and results: (1) the results showed that the adhesion force test: The different moisture content, the soil displacement corresponding to the foundation and the soil detachment remained unchanged with the drawing rate increased, the adhesion strength between the foundation and the soil was "S" curve "with drawing rate increases; the same drawing rate, soil position corresponding to the shift from the foundation and the soil with water content increased to a peak and then decreases gradually with the increase of water content, the adhesion strength is the single peak curve, the peak point and the corresponding adhesion strength increases with the increase of speed, the corresponding moisture content decreased correspondingly. (2) with the adhesion strength of undrained strength normalized with the increase of water content increasing, adhesion strength soil and soil structure between the cohesion is different. (3) single ship model test based on the computing model of three-dimensional structure of soft clay foundation in drawing. Using Mises yield criterion calculation model, and consider Between the soil and structure by using the cohesive model. Finite element analysis shows that the variation of pore pressure and the test results are in agreement with the drawing process, verify the cohesive model can reflect the soil structure contact surface deformation characteristics. (4) through the finite element analysis shows that the adhesion properties of soil and structure the soil is an important factor in the drawing process of negative pore pressure development, also affect the soil on the adsorption force structure size.

【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU442

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本文編號(hào)：1400858