路基填土破损过程的细观识别与破损参数测定
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摘要
利用可同步进行CT扫描的三轴仪，进行了不同围压下路基填土的三轴压
缩实验和蠕变实验。首次从CT数和CT图像两方面描述了路基填土的破损过
程。提出了一种基于CT图像和立体测量技术定量评价上体结构性的方法和相
应的定量指标，并首次对CT图像进行了处理。定量地分析了土体破损过程中
结构性的变化，同时分析了路基填土破损过程中微裂纹产生的机制，并从断裂
力学角度证明了土体最终的破坏模式。
应用广义双剪应力理论，推导了拉压性能不同材料的圆环的极限压力表达
式，并在此基础上开发了一套新的实验装置，对重塑黄土的抗拉强度和断裂韧
度进行了测定。
开发编制了能自动进行最危险滑动面搜寻和最小安全系数计算的数值软件
FREAME，在此基础上绘制了基于简化Bishop法的路基边坡稳定性分析图，并
用算例进行了验算。
The triaxial compression tests and creep tests of subgrade soil samples with
different lateral pressures are conducted with a new set of modified triaxial
compression apparatus which made the soil samples can be scanned with CT at the
same time during compression process.
With the test results, the different damage processes of soil samples are
described for the first time from both of the CT numbers and CT images. A new
method and two quantitative indexes are also presented to analyze the change of soil
fabric during the damage process on the basis of CT images and stereological
technique.
The production mechanisms of micro-crack in the soil samples during the
damage process are analyzed and the failure modes are concluded from the point of
view of fracture mechanics. With the theory of generalized twin shear stress strength,
we also presented the formula of limiting inner pressures for ring with different
strength in tension and compression. On the basis of those formulas, a new set of
test apparatus is developed and the tension strength as well as fracture toughness of
compacted bess is determined.
A set of software (FREAME) is developed for the automatic search of the most
unstable sliding surface and calculation of the lowest safety index. With this
software, a concise graph for the stability of subgrade slope with simplified Bishop's
method is obtained by systematic calculation. The samples on stability of subgrade
slope are calculated.
缩实验和蠕变实验。首次从CT数和CT图像两方面描述了路基填土的破损过
程。提出了一种基于CT图像和立体测量技术定量评价上体结构性的方法和相
应的定量指标，并首次对CT图像进行了处理。定量地分析了土体破损过程中
结构性的变化，同时分析了路基填土破损过程中微裂纹产生的机制，并从断裂
力学角度证明了土体最终的破坏模式。
应用广义双剪应力理论，推导了拉压性能不同材料的圆环的极限压力表达
式，并在此基础上开发了一套新的实验装置，对重塑黄土的抗拉强度和断裂韧
度进行了测定。
开发编制了能自动进行最危险滑动面搜寻和最小安全系数计算的数值软件
FREAME，在此基础上绘制了基于简化Bishop法的路基边坡稳定性分析图，并
用算例进行了验算。
The triaxial compression tests and creep tests of subgrade soil samples with
different lateral pressures are conducted with a new set of modified triaxial
compression apparatus which made the soil samples can be scanned with CT at the
same time during compression process.
With the test results, the different damage processes of soil samples are
described for the first time from both of the CT numbers and CT images. A new
method and two quantitative indexes are also presented to analyze the change of soil
fabric during the damage process on the basis of CT images and stereological
technique.
The production mechanisms of micro-crack in the soil samples during the
damage process are analyzed and the failure modes are concluded from the point of
view of fracture mechanics. With the theory of generalized twin shear stress strength,
we also presented the formula of limiting inner pressures for ring with different
strength in tension and compression. On the basis of those formulas, a new set of
test apparatus is developed and the tension strength as well as fracture toughness of
compacted bess is determined.
A set of software (FREAME) is developed for the automatic search of the most
unstable sliding surface and calculation of the lowest safety index. With this
software, a concise graph for the stability of subgrade slope with simplified Bishop's
method is obtained by systematic calculation. The samples on stability of subgrade
slope are calculated.
引文
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