强夯法在山区高速公路红砂岩碎石土回填路基中的运用研究

发布时间：2018-05-06 06:38

本文选题：强夯 + 红砂岩　；参考：《郑州大学》2017年硕士论文

【摘要】：红砂岩地层广泛分布于湖南西南山区,具有强度低,抗风化能力差、遇水软化、失水崩解等不良力学性质。选用红砂岩碎石土作为山区高速公路路基回填料,需对红砂岩碎石土的基本性质及填筑工艺进行科学探究。因此,开展强夯法在山区高速公路红砂岩碎石土回填路基的试验研究,并提出适用性的强夯加固工艺和高效的原位试验方法,具有一定理论和实际意义。本文依托湖南西南山区武靖高速公路某回填土路基试验段工程,根据现场地勘结果,结合国内外相关文献资料,开展强夯法在山区高速公路红砂岩碎石土回填路基的试验研究。首先,基于强夯法波动理论及饱和土与非饱和土加固理论,研究红砂岩碎石回填土的土的加固机理;同时,从强夯施工参数及土体本身物理性质两方面,讨论红砂岩碎石回填土的强夯加固影响因素。其次,开展强夯法在山区高速公路红砂岩碎石土回填路基的试验研究。通过地质勘查和室内土工试验,结合以往红砂岩类似工程的处理经验,对山区红砂岩碎石土作为路基填料可行性进行探究,确定红砂岩碎石土预崩解处理工艺,并制定了800kN·m、1000kN·m、1200kN·m、1400kN·m等四个不同能级的强夯加固方案及试验方案。在强夯加固红砂岩碎石土回填路基过程中,运用平板荷载试验、动力触探试验、面波试验、路基土变形试验等方法,探究山区红砂岩碎石土回填路基的强夯加固效果。确定适宜的强夯工艺为:当回填土厚度为4~5m时,以采用I1-2区1000 kN·m的强夯工艺为宜;当回填土厚度为5~6m时,以采用I1-3区1200 kN·m的强夯工艺为宜。最后,通过现场试验设计及数理统计方法,开展原位试验之间的相关性研究,发现平板荷载试验、动力触探试验、瞬态瑞利波试验之间存在一定相关性,并得出相关性经验公式,可用于简化后续大面积施工时的试验方案,加快工程进度,节约检测费用。
[Abstract]:The red sandstone strata are widely distributed in the southwest mountainous area of Hunan Province. They have poor mechanical properties such as low strength, poor weathering resistance, water softening and water loss disintegration. In order to select red sandstone gravel soil as the filling material of highway roadbed in mountainous area, the basic properties and filling technology of red sandstone gravel soil should be studied scientifically. Therefore, it is of certain theoretical and practical significance to carry out the experimental study of dynamic compaction method in the backfill roadbed of red sandstone gravel soil of mountain expressway, and to put forward the applicable technology of dynamic compaction and high-efficient in-situ test method. Based on a backfill roadbed test section of Wujing Expressway in southwest mountainous area of Hunan Province, according to the results of field geological prospecting and related documents at home and abroad, the experimental study of dynamic compaction method for backfilling roadbed of red sandstone gravel soil in mountainous expressway is carried out in this paper. Firstly, based on the wave theory of dynamic compaction method and the reinforcement theory of saturated soil and unsaturated soil, the reinforcement mechanism of red sandstone gravel backfill soil is studied, at the same time, from two aspects of dynamic compaction construction parameters and physical properties of soil itself, The influence factors of dynamic consolidation of red sandstone gravel backfill are discussed. Secondly, the dynamic compaction method is applied to the embankment backfill of red sandstone gravel soil in mountain expressway. Through geological exploration and laboratory geotechnical test, combined with previous experience in similar projects of red sandstone, the feasibility of red sandstone gravel soil as subgrade filler in mountainous area was explored, and the pre-disintegration treatment technology of red sandstone gravel soil was determined. The reinforcement scheme and test scheme of four different energy levels, such as 1000kN ~ (1 000) KN ~ (1 000) KN ~ (1 000) N ~ (-1) ~ (-1) KN ~ (1 +) and 1400kN ~ (m), are In the course of dynamic consolidation of red sandstone gravel soil backfill subgrade, using the methods of plate load test, dynamic penetration test, surface wave test, subgrade soil deformation test and so on, the effect of dynamic compaction on the backfill subgrade of red sandstone gravel soil in mountainous area is explored. The suitable dynamic compaction technology is determined as follows: when the backfill thickness is 45 m, the dynamic compaction process of 1000 km in the I1-2 area is suitable, and the dynamic compaction process of 1200 km in the I1-3 area is suitable when the backfill thickness is 5 ~ 6 m. Finally, through the field test design and mathematical statistics method, the correlation between in-situ test and in-situ test is studied. It is found that there is a certain correlation among plate load test, dynamic penetration test and transient Rayleigh wave test. The empirical formula of correlation can be used to simplify the test scheme of the follow-up large-scale construction, accelerate the progress of the project and save the testing cost.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1

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