【作者】 李晶；

【导师】 程培峰；

【作者基本信息】 东北林业大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 哈尔滨市松北规划区,是2004年2月经国务院批准设立的哈尔滨市的新辖区,兼有政府行政和开发区建设管理双重职能。该区现已进入大规模建设,在道路建设过程中,一直以117.50m作为最低设计控制标高,而松北区内地面标高一般在115.00～118.00m之间,这就导致在建设过程中出现了高路基的问题。在松北区城市道路的合理高度的研究过程中,首先现场调查松北区水文地质条件,根据该区道路建设现状及自然特性选择具有代表性的路段作为研究对象,采集路基土。然后结合室内试验,分析了该区路基土的工程性质,对路基内不同含水量时土的力学性质进行了试验研究。结果表明,松北区粘性土路基内的含水量控制在最佳含水量时,填料强度(CBR)为6.6%,承载力为36.6MPa,能够满足路面对路基强度的要求,但随着含水量的增大强度变小。冻融试验结果表明,该区粘性路基土易受水温条件变化的影响,冻融循环对土的含水量、密度、回弹模量及抗剪强度都有一定的影响。最终利用统计分析软件SPSS建立了路基干湿状况模型,并通过假设检验证明所得模型是有意义的。利用建立的模型确立了适合松北区自然条件的粘性土路基的临界高度,处于干燥状态时的临界高度为2.5m,中湿状态时为2.2m,潮湿状态为1.9m。研究成果为松北区道路规划设计提供了理论参考,对道路工程建设有积极的指导意义。更多还原

【Abstract】 Song Bei planning area is a new established scoping in Harbin that approved by the State Council. The area are constructed cosmically at present, in road constructing process, elevation 117.50m is used as control all the while, but ground elevation in this area is between 115.00~118.00m generally,so the 117.50m result in the problem of high roadbed during the process of construction.In the process of researching the reasonable height of the cityroad in Song Bei area, carry through field investigation of hydrogeology condition firstly, and choose representative constructed roads as research object in according to the present situation of road construction and natural characteristic, collect subgrade soil. And then combine with laboratory test, it was studied engineering properties of subgrade soils, but also mainly studied the effect of water content on mechanical properties of subgrade soils. The results showed that when the water content in the cohesive soil subgrade be controlled under the optimum water content, the strength(CBR) of subgrade filler is 6.6%, and the bearing capacity is 36.6MPa, can satisfied the pavement demand to subgrad strength, but the strength decreased with the increasing of water content. The result of freezing and thawing test showed that viscous subgrade soil effect of the variation of water temperature conditions, freeze-thaw cycles fuction effected on water content、density、springback modulus、shearing strength. Make use of SPSS statistical analysis software to build dry and humidity conditions model of subgrade gradually, and prove the availability model significative by means a series of hypothesis testings. Establish the critical height of the cohesive soil subgrade that suitable for the natural conditions of Song Bei area by making use of the model, the critical height at dry state is 2.5m, at medium moist state is 2.2m and at damp state is 1.9m calculated by the model. The research result provides road planning design of Song Bei area with theoretical reference, and has active guiding significance for the construction of road engineering.更多还原