【摘要】：本文對(duì)華東地區(qū)的軟弱粘土進(jìn)行了研究,通過(guò)人工制備結(jié)構(gòu)性土、不固結(jié)快剪和壓縮固結(jié)試驗(yàn),探究了膠凝劑含量對(duì)粘聚力和內(nèi)摩擦角的影響,以及對(duì)結(jié)構(gòu)性強(qiáng)弱的改變。并基于試驗(yàn)數(shù)據(jù),使用MATLAB軟件擬合函數(shù),建立粘聚力、內(nèi)摩擦角與壓縮屈服應(yīng)力之間的數(shù)學(xué)模型。同時(shí)通過(guò)試驗(yàn)研究主要得到了以下幾點(diǎn)結(jié)論:(1)摻入的膠凝劑可以不同程度的增加土粒間的摩阻力和連鎖效應(yīng),膠凝劑顆粒固化后亦可增強(qiáng)土體顆粒間的粘聚力和膠結(jié)作用,增強(qiáng)骨架間的牢固性,進(jìn)而提高軟粘土的結(jié)構(gòu)性,可以很好的模擬原狀土的結(jié)構(gòu)性。(2)文章引入“屈強(qiáng)比”的概念將結(jié)構(gòu)性土的強(qiáng)弱程度區(qū)分為“脆性結(jié)構(gòu)土”和“柔性結(jié)構(gòu)土”。“脆性結(jié)構(gòu)土”受剪過(guò)程中,前期處于彈性變形階段,剪應(yīng)力隨位移近似呈線(xiàn)性變化,土樣一旦發(fā)生破壞,剪應(yīng)力~位移曲線(xiàn)所表現(xiàn)出的“剪應(yīng)力崩塌”現(xiàn)象較為明顯。(3)結(jié)構(gòu)屈服應(yīng)力可以很好的反映土體結(jié)構(gòu)性的大小。當(dāng)土體結(jié)構(gòu)性較低,較小時(shí),結(jié)構(gòu)性對(duì)內(nèi)摩擦角φ的影響較為顯著;當(dāng)土體結(jié)構(gòu)性較強(qiáng),較大時(shí),結(jié)構(gòu)性對(duì)粘聚力c影響顯著。c隨呈指數(shù)增長(zhǎng),φ隨呈負(fù)指數(shù)(對(duì)數(shù))增長(zhǎng)。(4)天然狀態(tài)下,軟粘土屬于“脆性結(jié)構(gòu)土”,具有較高的靈敏性。在工程實(shí)踐中,應(yīng)選用合適的地基處理方法,盡可能減少“脆性結(jié)構(gòu)土”。避免不均勻沉降和突然性破壞帶來(lái)的安全危險(xiǎn)。研究成果具有一定的實(shí)用意義,可供工程實(shí)踐參考。
[Abstract]:In this paper, the soft clay in East China is studied. The influence of the content of gelling agent on cohesion and internal friction angle, and the change of structural strength and strength are explored through the artificial preparation of structural soil, unconsolidated quick shear and compression consolidation tests. Based on the experimental data, the mathematical model of cohesion, angle of internal friction and compressive yield stress is established by using MATLAB software fitting function. The main conclusions are as follows: (1) Additive gelling agent can increase frictional resistance and interlocking effect of soil particles in different degree. The solidification of gelling agent particles can also enhance the cohesion and cementation of soil particles, enhance the fastness of the framework, and then improve the structure of soft clay. The structure of undisturbed soil can be well simulated. (2) in this paper, the concept of "yield to strength ratio" is introduced to divide the strength of structural soil into "brittle structure soil" and "flexible structure soil". In the shear process of "brittle structure soil", the shear stress changes linearly with displacement in the early stage of elastic deformation. The shear stress-displacement curve shows that the phenomenon of "shear stress collapse" is obvious. (3) the yield stress of structure can well reflect the size of soil structure. When the structure of soil is low and small, the influence of structure on internal friction angle 蠁 is obvious. When the structure of soil is strong, the influence of structure on cohesion C is significant. C increases exponentially, 蠁 increases with negative exponent (logarithm). (4) in natural state, soft clay belongs to "brittle structure soil". It has high sensitivity. In engineering practice, appropriate foundation treatment methods should be selected to minimize the "brittle structure soil". Avoid the safety danger caused by uneven settlement and sudden destruction. The research results have certain practical significance and can be used for reference in engineering practice.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU411

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