青海地区苔藓结皮对土遗址片状剥离的影响

发布时间：2018-04-18 05:31

本文选题：苔藓 + 片状剥离　；参考：《工程科学与技术》2017年05期

【摘要】：片状剥离是土遗址表面普遍发育的病害,对遗址的长期保存构成了极大的威胁。近年来,大量学者尝试多种手段对片状剥离病害进行整治,但在实际的保护加固工程中效果仍不太理想。目前,利用苔藓加固边坡、保持水土的研究和应用日益丰富。本文从土遗址保护的目的出发,采用在遗址表层培育苔藓的方法,利用生物结皮改善遗址表面片状剥离状态。以青海地区为例,在野外研究中利用微型贯入仪测量苔藓生长前后墙体的表面贯入阻力,并对比分析表面龟裂的变化。室内试验中将土遗址墙面自外向内分成5个土层,利用X衍射仪对各土层进行矿物成分分析;用激光粒度仪对各土层进行颗粒分析,并用离子色谱仪分析各土层的盐分含量。野外试验发现,有苔藓时墙体的表面贯入阻力比无苔藓时明显提高,且原来片状剥离的龟裂也在苔藓生长过程中得以修复。室内试验表明:苔藓生长前后各土层矿物成分及含量均没有发生明显变化;土壤颗粒粒径会趋于减小,粉粒和黏粒含量增多;有苔藓时粉化层中盐分含量明显下降,其他土层盐分含量较无苔藓时有较大提升。苔藓生长后原墙体表面片状剥离的强度和颗粒结构均明显提升,且盐分富集现象得到了较好的改善,土体整体工程性能相对提升。因此,苔藓加固片状剥离有非常广阔的研究前景。
[Abstract]:Flake peeling is widely developed in surface soil sites of disease, long-term preservation of sites pose a great threat. In recent years, many scholars try various means on the regulation of exfoliative diseases, but the reinforcement effect in actual engineering protection is still not ideal. At present, slope reinforced by moss, keep the research and application of soil the purpose of this paper is rich. From the relic protection of the cultivation of moss on the surface site, improve the site of flaking using biological crusts. Taking Qinghai area as an example, in the field of measurement using moss micro penetrometer growth before and after surface penetration resistance of the wall, and compared the changes of surface cracking. The indoor experiment, the inner wall of soil sites were divided into 5 layers, each layer of mineral composition analysis by X diffraction; for each layer by laser particle size analyzer Particle analysis and ion chromatography analysis of salt content in each soil layer. The field test showed that the moss surface penetration resistance wall than the no moss increased significantly, and the original flake cracking in moss growth process could be repaired. The indoor test shows: moss growth before and after the soil mineral composition and content did not occur the obvious change; soil particle size tends to decrease, increase the silt and clay content; moss powder layer when the salt content decreased significantly, other soil less moss moss growth has greatly improved. After the original wall strength and particle structure of flaking was improved significantly, and the salt accumulation the phenomenon has been improved, the overall performance of the soil engineering is relatively improved. Therefore, strengthening moss flake research prospects are very broad.

【作者单位】：兰州大学土木工程与力学学院西部灾害与环境力学教育部重点实验室;
【基金】：国家科技支撑计划资助项目(2014BAK16B02) 文物保护和技术研究课题资助项目(2013-YB-SQ-120)
【分类号】：K878;TU-87

【相似文献】