滨海淤泥固化填筑路基应用技术研究

发布时间：2019-04-24 11:59

【摘要】：淤泥具有含水量高、含盐量高、力学性能差等特性,不可直接应用于填筑路基。在道路施工过程中,需对淤泥地段进行挖除,采用回填土进行处治,但开挖淤泥具有工程量较大、造价高、占用场地多等缺点。因此,在实际工程应用中采用固化剂对淤泥进行固化处理,研究以节能、降耗为指导的淤泥固化填筑技术,现场对淤泥进行固化处理使其转化为道路路基的填筑材料,对开发道路新材料、保护环境及节约工程造价等方面具有重要意义。本文以滨海地区淤泥为例,系统研究淤泥材料特性、固化淤泥性能及固化淤泥填筑路基施工工艺及质量控制,主要研究内容包括:(1)针对滨海淤泥进行物理化学指标测定,与全国其他地域淤泥的性质指标进行对比分析,总结淤泥初始含水率、有机质含量、矿物成分等对淤泥工程性质的影响规律,选择其中的关键指标对淤泥进行统一分类,提出固化剂固化淤泥效果评价指标及固化剂选择依据。(2)系统研究固化淤泥最佳含水量与最大干密度、CBR值、无侧限抗压强度、抗压回弹模量及耐水性能随固化剂掺量的变化规律,分析不同固化剂类型、掺量对固化淤泥CBR值的影响作用,建立固化淤泥CBR值、无侧限抗压强度随固化剂掺量变化的回归关系式,对两种固化淤泥进行回弹模量试验、耐水性试验及抗冻融试验,确定固化淤泥力学性能、耐水性能、抗冻融性能随固化剂掺量的变化规律。(3)系统研究淤泥固化填筑路基施工准备、施工工艺、质量控制和路基沉降等四个方面,提出固化淤泥填筑路基施工工艺要求及质量控制标准。
[Abstract]:Due to its high water content, high salt content and poor mechanical properties, silt can not be directly used to fill roadbed. In the course of road construction, it is necessary to excavate the silt section and treat it with backfill. However, the excavation of silt has the disadvantages of large amount of engineering, high cost and many occupied sites. Therefore, in practical engineering application, the solidifying agent is used to solidify the sludge, and the solidified filling technology guided by energy saving and consumption reduction is studied. The solidified sludge is transformed into the filling material of road roadbed by solidifying treatment on the spot. It is of great significance in developing new road materials, protecting environment and saving project cost. Taking the silt in coastal area as an example, this paper systematically studies the characteristics of sludge materials, the properties of solidified silt and the construction technology and quality control of solidified silt filling roadbed. The main research contents are as follows: (1) the physical and chemical indexes of coastal silt are determined. This paper compares and analyzes the properties of silt in other regions of China, summarizes the effects of initial moisture content, organic matter content and mineral composition on the engineering properties of silt, and selects the key indexes for the unified classification of silt. The evaluation index of solidified sludge effect and the basis of curing agent selection are put forward. (2) the optimum moisture content and maximum dry density, CBR value and unconfined compressive strength of solidified sludge are systematically studied. The variation of compressive resilience modulus and water resistance with the content of curing agent was analyzed. The effect of different curing agent types and the amount of curing agent on the value of CBR of solidified sludge was analyzed, and the value of CBR of solidified sludge was established. The regression relationship of unconfined compressive strength with the content of curing agent was used to test the modulus of resilience, water resistance and freeze-thaw test of two kinds of solidified sludge, to determine the mechanical properties and water resistance of the solidified sludge, and to determine the mechanical properties and water resistance of the solidified sludge. The change of freeze-thaw resistance with the content of curing agent. (3) the construction preparation, construction technology, quality control and roadbed settlement of silt-solidified filling roadbed are systematically studied. The construction technology requirements and quality control standards of solidified silt filling roadbed are put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

【相似文献】