河砂与建筑垃圾混合料回填路基工程特性研究
发布时间：2018-10-29 08:32
【摘要】：近年来随着城市发展步伐的加快,城中村、旧城、棚户区改造等工程中产生大量建筑垃圾,其中大部分未经任何处理便运往城郊或乡村简易填埋甚至露天堆放。建筑垃圾作为一种可再生资源,传统的处理方式不仅造成了环境污染,破坏城市环境,污染地下水,而且是一种资源的巨大浪费。形成鲜明对比的是,在公路工程中路基填料却是日趋匮乏。河砂作为常见的路基回填材料,随着开采深度增加,过细的河砂已经不能满足工程需要。针对上述两个问题,本文对不同比例的河砂与建筑垃圾混合料作为路基填料进行了多方面探究。本文选用的建筑垃圾取自济南市刘智远片区旧村改造工程,初步处理后的建筑垃圾砖砼比例约为7:3,建筑垃圾的表观密度约为2.47,比重约为2.72,吸水率约为5.35%,压碎值约为38.07%。本文选用的细河砂比重约为2.65,含泥量约为3.2%。本文设置了五种比例的河砂与建筑垃圾的混合料,其忱例分别为10:0、8:2、6:4、4:6、2:8,分别对应试样A、B、C、D、E。本文对混合料的物理力学性能与路用性能进行了室内试验研究,并通过FLAC3D对混合料的抗液化性能与沉降变形进行了数值模拟,得到如下结论:(1)通过室内土工试验,研究了混合料的物理力学性能指标,主要的测试的内容包括颗粒比重、颗粒级配、击实试验、常水头渗透试验、毛细管水上升高度和直剪试验。综合分析试验结果,就物理力学性能进行排序:试样C≈试样D试样E试样B试样A。(2)针对混合料的路用性能,对不同比例混合料的击实特性、承载能力特性以及动力强度特性分别通过击实试验、承载比试验和室内动三轴试验进行比较,就路用性能进行排序:试样C试样D试样B试样E-试样A。综合分析物理力学性能与路用性能,就工程性能而言试样C试样D试样B≈试样E试样A。(3)应用有限差分软件FLAC3D研究了不同比例混合料在八度设防地区(山东省临沂市)的设计地震作用下的液化情况。模拟结果表明,纯河砂路基液化风险最高、液化速度最快,随着建筑垃圾含量的增加,液化风险降低,当比例为6:4时基本不存在液化的风险,抗液化性能试样E≈试样D试样C试样B试样A。(4)应用有限差分软件FLAC3D模拟了不同比例混合料的路基填筑的施工过程。根据规范要求和模拟结果,确定比例为10:0、2:8的混合料的每天最大填筑高度不宜超过0.25米,比例为8:2、6:4、4:6的混合料的每天最大填筑高度不宜超过0.2米。通过室内试验与数值模拟的结果表明,河砂中添加一定比例的建筑垃圾可以有效改善河砂的工程性能,当建筑垃圾比例为40%～60%时工程性能最好,具有一定的工程应用前景。
[Abstract]:In recent years, with the acceleration of the pace of urban development, a large number of construction waste has been generated in urban villages, old cities, shantytowns and other projects, most of which are transported without any treatment to the suburbs or villages, simple landfills or even open-air stacking. As a kind of renewable resources, the traditional treatment not only causes environmental pollution, destroys the urban environment, pollutes the groundwater, but also is a huge waste of resources. In contrast, roadbed fill is increasingly scarce in highway engineering. River sand as a common subgrade backfill material, with the increase of mining depth, the fine river sand can not meet the engineering needs. In view of the above two problems, different proportions of river sand and construction waste mixture as subgrade fillers are explored in this paper. The construction waste selected in this paper is taken from the reconstruction project of the old village in LiuZhiyuan District, Jinan City. The proportion of construction garbage brick concrete after preliminary treatment is about 7: 3, the apparent density of construction waste is about 2.47, and the proportion is about 2.72. The water absorption rate is about 5.35 and the crushing value is about 38.07. The specific gravity of fine river sand and mud content are about 2.65 and 3.2 respectively. In this paper, five kinds of mixture of river sand and construction waste are set up. The examples are 10: 0, 8: 8, 4: 4, 4: 4, 6: 2: 8, respectively, corresponding to the sample AZB BU CU De. In this paper, the physical and mechanical properties and road performance of the mixture are studied in laboratory, and the liquefaction resistance and settlement deformation of the mixture are simulated by FLAC3D. The conclusions are as follows: (1) through the indoor geotechnical test, The physical and mechanical properties of the mixture are studied. The main contents of the tests include particle specific gravity, particle gradation, compaction test, constant head penetration test, capillary water rising height and direct shear test. Synthetically analyzing the test results, the physical and mechanical properties are sorted: sample C 鈮，
本文编号：2297172
[Abstract]:In recent years, with the acceleration of the pace of urban development, a large number of construction waste has been generated in urban villages, old cities, shantytowns and other projects, most of which are transported without any treatment to the suburbs or villages, simple landfills or even open-air stacking. As a kind of renewable resources, the traditional treatment not only causes environmental pollution, destroys the urban environment, pollutes the groundwater, but also is a huge waste of resources. In contrast, roadbed fill is increasingly scarce in highway engineering. River sand as a common subgrade backfill material, with the increase of mining depth, the fine river sand can not meet the engineering needs. In view of the above two problems, different proportions of river sand and construction waste mixture as subgrade fillers are explored in this paper. The construction waste selected in this paper is taken from the reconstruction project of the old village in LiuZhiyuan District, Jinan City. The proportion of construction garbage brick concrete after preliminary treatment is about 7: 3, the apparent density of construction waste is about 2.47, and the proportion is about 2.72. The water absorption rate is about 5.35 and the crushing value is about 38.07. The specific gravity of fine river sand and mud content are about 2.65 and 3.2 respectively. In this paper, five kinds of mixture of river sand and construction waste are set up. The examples are 10: 0, 8: 8, 4: 4, 4: 4, 6: 2: 8, respectively, corresponding to the sample AZB BU CU De. In this paper, the physical and mechanical properties and road performance of the mixture are studied in laboratory, and the liquefaction resistance and settlement deformation of the mixture are simulated by FLAC3D. The conclusions are as follows: (1) through the indoor geotechnical test, The physical and mechanical properties of the mixture are studied. The main contents of the tests include particle specific gravity, particle gradation, compaction test, constant head penetration test, capillary water rising height and direct shear test. Synthetically analyzing the test results, the physical and mechanical properties are sorted: sample C 鈮，
本文编号：2297172
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2297172.html
