南疆盐渍土路基盐—冻胀变形特性研究
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摘要
新疆南疆分布有大面积的盐渍土,以硫酸盐渍土和氯化物盐渍土为主。在南疆季节性冻土地区,盐渍土路基的盐-冻胀变形往往造成南疆盐渍土地区道路的变形和破坏。如何对变形破坏道路进行有效的修复和重建是一个十分重要的课题,也是一个难题,其中一个重要内容就是要开展南疆盐渍土路基盐-冻胀变形特性的研究。本文的主要研究工作和成果如下:
通过采用现场调研和试验对比研究的方法,对南疆不同地区盐渍土的分布、形成、工程特性进行研究,结果表明:南疆不同地区受地理位置、区域地形、地貌及地下水分布的差异和地质构造的影响,其盐渍土的分布、形成、类型及盐分组成具有明显的区域差异性。
通过对S207线和阿拉尔市变形破坏路段进行路基盐-冻胀变形监测试验。试验结果表明:路面盐-冻胀变形量与日平均气温、路基土不同深度的地温值及地下水位的变化具有明显的相关性;路基最大盐-冻胀变形量在时间上滞后于日平均最低气温和路基不同深度最低地温值。
通过对阿拉尔市和S207线试验路段的路面变形量、路基不同深度地温、测区气温和地下水位进行现场监测试验和室内盐-冻胀变形试验研究。研究结果表明:S207线路基的变形破坏主要是硫酸钠盐胀变形与氯化物盐的溶陷变形相互作用的结果。其盐分来源于高矿化度的地下水经毛细作用将路基深层土体中易溶的硫酸盐、氯化物盐迁移积聚至路基结构层中。在温度交替变化过程中产生反复的盐胀、溶陷变形。阿拉尔市道路变形破坏属于冻胀和盐胀变形破坏。产生盐胀的硫酸钠盐使路基水泥稳定基层膨胀破坏,路面产生裂缝变形;地表水经路面裂缝和路基侧面入渗路基,在U形不透水隔断层上形成上层滞水,加之阿拉尔市11月份的高地下水位,为冬季低温环境下路基土体的冻胀变形提供了充足的冻结水,加速了路面的变形破坏。
根据南疆盐渍土工程性质及盐-冻胀变形试验研究结果,总结提出了“一个加强、两个严格、三个注重”的盐渍土路基盐-冻胀变形综合防治原则;针对南疆盐渍土路基盐-冻胀工程灾害,提出“五步骤”综合防治方法与工程措施,在南疆盐渍土路基的改建工程中得到了应用,取得明显的防治效果。
There are large areas of distribution of saline soil in southern Xinjiang, mainly saline soil with sulfuric acid and chlorine-based saline soil. In seasonal frozen soil areas in southern Xinjiang, the expansion of sulfate salts and chloride salts dissolved collapsible caused deformation and damage of the road. How to effective repair and reconstruction the roads of deformation and damage is a very important issue, it is also a problem, it is an important part which of To carry out research work of saline soil subgrade salt-frost heave deformation properties in southern Xinjiang. The main research work and results are as follows:
By adopting the comparative method of the use of On-site investigation and trial, to study the distribution、formation and engineering characteristics of saline soil in different parts of the southern Xinjiang ,and the results showed that: There are clear regional differences in the distribution, formation, type and composition of the salt saline soil in different parts of the southern Xinjiang by the impact of geographical location, the region's topography, geomorphology and water distribution and geological differences.
Through carry out salt-frost heave deformation monitoring test about the section of deformation and damage of Road S207 and Alar urban road. The results showed that: road surface salt-frost heave deformation and the average daily temperature and different depths of the roadbed soil temperature and change the water table have obvious relevance; the maximum salt-frost heave deformation in time lags behind the minimum temperature of daily average and at different depths to the minimum temperature value of roadbed.
Through tested the road surface deformation, the roadbed ground temperature at different depths, the temperature of measurement area and the water table on-site testing and monitoring indoor salt- frost heave deformation of in Alaer City line and S207-line .The results show that: S207-line’s deformation failure is mainly because of the sodium chloride and the salt expansion deformation of the salt solution collapse deformation interaction. Salt from its high salinity of the water by capillary action will be deep roadbed soil in the soluble sulfate, chloride salts migrate to the accumulation of separation layer structure. At the turn of temperature changes in the process of repeated expansion of salt, the melting depression change.The form of frost damage to the road in Alaer City belongs to the expansion of salt and deformation failure. The sodium salt resulting expansion of cement road salt so that the stability of the expansion of the damage to the grass-roots level, have a surface crack deformation; surface water through surface cracks and infiltration side of the road embankment, in the U-shaped cut off impermeable layer on the formation of the upper stagnant water and Alar City in November of a high water table for the winter low temperature environment road frost heave deformation of the soil to provide sufficient water to freeze and accelerated the deformation of the surface damage.
According to the Southern Xinjiang saline soil and salt nature of the project - the evaluation of frost heave deformation test results, the sum put forward "a Strengthen ,two Strict , three Attention " ----the principle of Salt saline soil subgrade - integrated control of frost heave deformation; for Southern Xinjiang road salt saline soil - frost heave engineering disaster, "five steps" comprehensive prevention and control methods and measures, saline soil in Southern Xinjiang of the road reconstruction works has been applied to obtain a clear effect.
通过采用现场调研和试验对比研究的方法,对南疆不同地区盐渍土的分布、形成、工程特性进行研究,结果表明:南疆不同地区受地理位置、区域地形、地貌及地下水分布的差异和地质构造的影响,其盐渍土的分布、形成、类型及盐分组成具有明显的区域差异性。
通过对S207线和阿拉尔市变形破坏路段进行路基盐-冻胀变形监测试验。试验结果表明:路面盐-冻胀变形量与日平均气温、路基土不同深度的地温值及地下水位的变化具有明显的相关性;路基最大盐-冻胀变形量在时间上滞后于日平均最低气温和路基不同深度最低地温值。
通过对阿拉尔市和S207线试验路段的路面变形量、路基不同深度地温、测区气温和地下水位进行现场监测试验和室内盐-冻胀变形试验研究。研究结果表明:S207线路基的变形破坏主要是硫酸钠盐胀变形与氯化物盐的溶陷变形相互作用的结果。其盐分来源于高矿化度的地下水经毛细作用将路基深层土体中易溶的硫酸盐、氯化物盐迁移积聚至路基结构层中。在温度交替变化过程中产生反复的盐胀、溶陷变形。阿拉尔市道路变形破坏属于冻胀和盐胀变形破坏。产生盐胀的硫酸钠盐使路基水泥稳定基层膨胀破坏,路面产生裂缝变形;地表水经路面裂缝和路基侧面入渗路基,在U形不透水隔断层上形成上层滞水,加之阿拉尔市11月份的高地下水位,为冬季低温环境下路基土体的冻胀变形提供了充足的冻结水,加速了路面的变形破坏。
根据南疆盐渍土工程性质及盐-冻胀变形试验研究结果,总结提出了“一个加强、两个严格、三个注重”的盐渍土路基盐-冻胀变形综合防治原则;针对南疆盐渍土路基盐-冻胀工程灾害,提出“五步骤”综合防治方法与工程措施,在南疆盐渍土路基的改建工程中得到了应用,取得明显的防治效果。
There are large areas of distribution of saline soil in southern Xinjiang, mainly saline soil with sulfuric acid and chlorine-based saline soil. In seasonal frozen soil areas in southern Xinjiang, the expansion of sulfate salts and chloride salts dissolved collapsible caused deformation and damage of the road. How to effective repair and reconstruction the roads of deformation and damage is a very important issue, it is also a problem, it is an important part which of To carry out research work of saline soil subgrade salt-frost heave deformation properties in southern Xinjiang. The main research work and results are as follows:
By adopting the comparative method of the use of On-site investigation and trial, to study the distribution、formation and engineering characteristics of saline soil in different parts of the southern Xinjiang ,and the results showed that: There are clear regional differences in the distribution, formation, type and composition of the salt saline soil in different parts of the southern Xinjiang by the impact of geographical location, the region's topography, geomorphology and water distribution and geological differences.
Through carry out salt-frost heave deformation monitoring test about the section of deformation and damage of Road S207 and Alar urban road. The results showed that: road surface salt-frost heave deformation and the average daily temperature and different depths of the roadbed soil temperature and change the water table have obvious relevance; the maximum salt-frost heave deformation in time lags behind the minimum temperature of daily average and at different depths to the minimum temperature value of roadbed.
Through tested the road surface deformation, the roadbed ground temperature at different depths, the temperature of measurement area and the water table on-site testing and monitoring indoor salt- frost heave deformation of in Alaer City line and S207-line .The results show that: S207-line’s deformation failure is mainly because of the sodium chloride and the salt expansion deformation of the salt solution collapse deformation interaction. Salt from its high salinity of the water by capillary action will be deep roadbed soil in the soluble sulfate, chloride salts migrate to the accumulation of separation layer structure. At the turn of temperature changes in the process of repeated expansion of salt, the melting depression change.The form of frost damage to the road in Alaer City belongs to the expansion of salt and deformation failure. The sodium salt resulting expansion of cement road salt so that the stability of the expansion of the damage to the grass-roots level, have a surface crack deformation; surface water through surface cracks and infiltration side of the road embankment, in the U-shaped cut off impermeable layer on the formation of the upper stagnant water and Alar City in November of a high water table for the winter low temperature environment road frost heave deformation of the soil to provide sufficient water to freeze and accelerated the deformation of the surface damage.
According to the Southern Xinjiang saline soil and salt nature of the project - the evaluation of frost heave deformation test results, the sum put forward "a Strengthen ,two Strict , three Attention " ----the principle of Salt saline soil subgrade - integrated control of frost heave deformation; for Southern Xinjiang road salt saline soil - frost heave engineering disaster, "five steps" comprehensive prevention and control methods and measures, saline soil in Southern Xinjiang of the road reconstruction works has been applied to obtain a clear effect.
引文
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