摘要
盐渍土地区道路受硫酸盐渍土盐胀性及氯化物盐渍土溶陷特性的影响,对路基路面造成一定的变形破坏。为了研究硫酸盐渍土在季节性冻土地区外界环境及氯化物盐对其盐胀性的影响,通过对S207线盐渍土病害路段进行变形监测和室内盐胀对比试验,对试验结果进行盐胀性评价。结果表明:盐胀率作为评价硫酸盐渍土盐胀性的一个重要指标,其计算值取决于盐胀保证率所能达到的盐胀有效影响深度的取值和年度最大盐胀变形量;年度盐胀变形量要考虑氯化钠盐和变形缓冲层对硫酸钠盐胀变形的抑制和缓解作用。针对南疆盐渍土盐胀变形特性及影响因素,总结提出了盐渍土路基盐胀变形综合防治原则和防治方法,在南疆S207线改建工程中得到了应用,取得明显的防治效果。
Saline Soil Area roads caused certain degree of deformation and damage by suffusion deformations of sulfate saline soil and dissolution subsidence deformations of chloride saline soil, in order to study chlorine salt and sulfate saline soil deformation characteristics＇ impact on external environment in the seasonal frozen soil areas. Through salt - frost heave deformation monitoring and indoor salt bulging contrast test about the section of deformation and damage of Road S207, analysis and evaluation of test results are carried out. The results showed that ： salt inflation rate as an important indicator for evaluation of suffusion deformations of sulfate saline soil, calculated salt inflation rate is affected directly by effective impact depth value in determining salt inflation ensurance rate and by suffusion deformations of saline soil. The annual monitoring value should take consideration of sodium chloride salt and suppression and mitigation of buffer layer of deformations to sulfate suffusion deformations. According to the Southern Xinjiang saline soil deformation characteristics and the impact of inflation factors, a summary is put forward about the principle and control methods of saline soil subgrade as well as comprehensive prevention of frost heave deformation; in Southern Xinjiang this method has been applied to the S207 road reconstruction works an obvious effect was obtained.
出处
《地下空间与工程学报》
CSCD
北大核心
2009年第3期594-603,共10页
Chinese Journal of Underground Space and Engineering
基金
塔里木大学校长基金自然科学项目(TDZKQN07003)
关键词
盐渍土路基
变形监测
盐胀性评价
盐胀变形
溶陷变形
saline soil subgrade
deformation monitoring
evaluation of suffusion deformations
suffusion de-formations of saline soil
dissolution subsidence deformations
