【作者】 张伟；

【导师】 宗琦； 丁光亚；

【作者基本信息】 安徽理工大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 随着国家对沿海产业带的发展建设,土地需求随之增加,各地因地制宜探索解决土地资源紧缺问题的方法,围海造地是最有可行性的方法。吹填海涂淤泥是由超软土形成的,这类的超软土含水率在80%以上,土体压缩性非常大,从而在实际工程中出现了很多的问题。吹填土具有超高含水率、压缩性高、高孔隙比、渗透性能差、抗剪强度强度低以及承载能力低等基本工程特性,为满足相应的工程建设的需要,就必须对其进行地基加固处理。为了探索能更好的加固吹填土地基的施工工艺,本文一方面进行了针对性设计的软黏土真空联合堆载预压室内试验试验,并且探索了不同堆载材料对三个模型箱内土体加固效果的研究;另一方面又根据本文室内试验的边界条件,并利用了塑料排水板换算公式和砂井固结理论,推导了适合本次室内试验的固结方程。本文结合了温州市某市政道路的工程实例。主要有五方面的工作:(1)通过各种途径收集阅读国内外的相关资料,对各种主要的软基处理方法,以及各个方法的优缺点做了概括。在这一方面,对真空联合堆载预压法进一步分析研究,从加固效果来看,真空联合堆载预压要比真空预压法或堆载预压法较好。(2)真空联合堆载预压法作为在真空预压法的基础上新发展起来的处理方法,具有真空预压和堆载预压共同作用的双重效果,取得的加固效果更好。在本文的室内试验方案的设定中,按照两部分进行,一部分是真空预压方案,另一方面是堆载预压方案。(3)通过设定的不同堆载材料的真空联合堆载预压试验,探究分析了对于高含水率、压缩性比较大的吹填土地基的加固机制,主要针对真空联合堆载预压过程中的土层沉降量、真空度、孔压变化、加固后含水率和施工工艺等方面进行了研究。(4)分析研究软弱土地基的固结理论,并且结合本文室内试验的边界条件,总结推理了固结理论方程。(5)在论文中加入了温州市某区的市政道路工程的算例,着重分析了该工程的固结沉降情况。利用Asaoka法,从该市政工程的现场实测资料推算最终沉降量,并计算了该工程中最不利点的固结度,确保了该工程的加固效果极佳。更多还原

【Abstract】 As countries to the development of coastal belt construction,the land demand increases,around adjust measures to local conditions to explore the method to solve the problem of shortage of land resources,spit of the sea is the most feasible method Reclaimed tidal marsh mud is made of the sea is soil,this kind of super soft soil moisture content over 80%,the soil compressibility is very big,so there are many problems in the practical engineering.Fill with high water content,high compressibility,high void ratio,poor permeability,shear strength of low strength and low carrying capacity of basic engineering properties,in order to meet the needs of the engineering construction,must carry on the foundation reinforcement.In order to explore a better reinforcement construction technology of the reclaimed soil foundation,in this paper,on the one hand,the specific design of the reclaimed soil vacuum combined pile load and explore the different stack preloading test materials for soil consolidation effect of research;on the other hand,according to the boundary conditions of indoor experiments in this paper,and the use of plastic drainage plate conversion formula and consolidation theory of sand drain,suitable for the model test of consolidation equation was deduced.In this paper,combined with the example of a blow in the new project in Wenzhou,an in-depth study of the foundation treatment There are five main aspects of the work:1.In this paper,through various channels to collect related data at home and abroad,this paper introduces the various the soft ground treatment method,and analyzes the advantages and disadvantages of each method of vacuum combined pile load preloading method,further analysis and research,form the point of strengthening effect,vacuum combined pile load preloading than vacuum preloading method or stack preloading method is better.(2)The vacuum preloading method as a preprocessing method based on Vacuum Preloading Method on the newly developed,has the double effect of vacuum preloading and surcharge preloading interaction,better reinforcement effect is achieved.In this laboratory test solution set,according to two parts,part is vacuum preloading scheme,on the other hand is stack preloading scheme.(3)By setting different stack material of vacuum combined pile load prepress test,to explore the analyses for the high moisture content,the compressibility of the bigger of the reclaimed soil foundation reinforcement mechanism,mainly aims at in the process of vacuum combined pile load preloading soil subsidence,vacuum degree,pore pressure change,moisture content after reinforcement and the construction technology and so on were studiedⅢ(4)Analysis of soft soil foundation consolidation theory,and combining with the boundary conditions of model test,this paper summarize the reasoning consolidation theory equation.(5)In this paper joined the Wenzhou district municipal road engineering example,analyzed the consolidation settlement of the project.更多还原