【摘要】：本文對華東地區(qū)的軟弱粘土進行了研究,通過人工制備結構性土、不固結快剪和壓縮固結試驗,探究了膠凝劑含量對粘聚力和內摩擦角的影響,以及對結構性強弱的改變。并基于試驗數據,使用MATLAB軟件擬合函數,建立粘聚力、內摩擦角與壓縮屈服應力之間的數學模型。同時通過試驗研究主要得到了以下幾點結論:(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,膠凝劑顆粒固化后亦可增強土體顆粒間的粘聚力和膠結作用,增強骨架間的牢固性,進而提高軟粘土的結構性,可以很好的模擬原狀土的結構性。(2)文章引入“屈強比”的概念將結構性土的強弱程度區(qū)分為“脆性結構土”和“柔性結構土”。“脆性結構土”受剪過程中,前期處于彈性變形階段,剪應力隨位移近似呈線性變化,土樣一旦發(fā)生破壞,剪應力~位移曲線所表現出的“剪應力崩塌”現象較為明顯。(3)結構屈服應力可以很好的反映土體結構性的大小。當土體結構性較低,較小時,結構性對內摩擦角φ的影響較為顯著;當土體結構性較強,較大時,結構性對粘聚力c影響顯著。c隨呈指數增長,φ隨呈負指數(對數)增長。(4)天然狀態(tài)下,軟粘土屬于“脆性結構土”,具有較高的靈敏性。在工程實踐中,應選用合適的地基處理方法,盡可能減少“脆性結構土”。避免不均勻沉降和突然性破壞帶來的安全危險。研究成果具有一定的實用意義,可供工程實踐參考。
[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.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU411

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