饱和结构性土的结构性强弱的室内试验确定研究
发布时间：2018-10-29 21:21
【摘要】：本文对华东地区的软弱粘土进行了研究,通过人工制备结构性土、不固结快剪和压缩固结试验,探究了胶凝剂含量对粘聚力和内摩擦角的影响,以及对结构性强弱的改变。并基于试验数据,使用MATLAB软件拟合函数,建立粘聚力、内摩擦角与压缩屈服应力之间的数学模型。同时通过试验研究主要得到了以下几点结论:(1)掺入的胶凝剂可以不同程度的增加土粒间的摩阻力和连锁效应,胶凝剂颗粒固化后亦可增强土体颗粒间的粘聚力和胶结作用,增强骨架间的牢固性,进而提高软粘土的结构性,可以很好的模拟原状土的结构性。(2)文章引入“屈强比”的概念将结构性土的强弱程度区分为“脆性结构土”和“柔性结构土”。“脆性结构土”受剪过程中,前期处于弹性变形阶段,剪应力随位移近似呈线性变化,土样一旦发生破坏,剪应力~位移曲线所表现出的“剪应力崩塌”现象较为明显。(3)结构屈服应力可以很好的反映土体结构性的大小。当土体结构性较低,较小时,结构性对内摩擦角φ的影响较为显著;当土体结构性较强,较大时,结构性对粘聚力c影响显著。c随呈指数增长,φ随呈负指数(对数)增长。(4)天然状态下,软粘土属于“脆性结构土”,具有较高的灵敏性。在工程实践中,应选用合适的地基处理方法,尽可能减少“脆性结构土”。避免不均匀沉降和突然性破坏带来的安全危险。研究成果具有一定的实用意义,可供工程实践参考。
[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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU411
本文编号：2298862
[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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU411
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