Response Difference of Aeolian Sand and Gravel Soil Low Embankment under Vehicle Loading
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摘要: 风积沙和砾类土是新疆绿洲–荒漠区常用的路基填料，为探明车辆荷载作用下风积沙和砾类土低路堤应力和应变响应的差异，分别采用风积沙和砾类土作为填料建立低路堤1∶1足尺模型，进行了地基含水率分别为18%、23%和28%的静载、短时动载和长时动载作用下低路堤模型试验。试验结果表明，长时动载作用下低路堤应力和应变最大，短时动载作用下应力和应变最小。静载、短时动载和长时动载作用下砾类土和风积沙低路堤的应力均随着深度的增加而衰减，砾类土低路堤衰减速度较快。距路基顶面0.6～1.0 m处存在应力响应分界点，路基顶面至分界点段砾类土低路堤的应力大于风积沙低路堤，分界点以下风积沙低路堤的应力大于砾类土低路堤。砾类土低路堤各结构层的应变均小于风积沙低路堤，随着地基含水率的增加风积沙低路堤地基部分应变增加值较大。Abstract: Aeolian sand and gravel soil are commonly used as subgrade fillers in oasis-desert area of Xinjiang. In order to find out the difference of stress and strain response of low embankment of aeolian sand and gravel soil under vehicle loading, 1:1 full scale models of low embankment were established by using aeolian sand and gravel soil as subgrade fillers, and the model tests of low embankment under static load, short-term dynamic load and long-term dynamic load were carried out with the foundation moisture content of 18%, 23% and 28% respectively. The test results show that the stress and strain of low embankment are the largest under long-term dynamic load, and the minimum under short-term dynamic load. Under static load, short-term dynamic load and long-term dynamic load, the stress of gravel soil and aeolian sand low embankment decreases with the increase of depth, and the attenuation speed of gravel soil low embankment is faster. There is a dividing point in the stress response at 0.6~1.0 m from the top of the subgrade. The stress of the gravel soil low embankment from the top of the subgrade to the dividing point is greater than that of the aeolian sand low embankment, and the stress of the aeolian sand low embankment below the dividing point is greater than that of the gravel soil low embankment. The strain of each structural layer of gravel soil low embankment is smaller than that of aeolian sand low embankment. With the increase of foundation moisture content, the strain of aeolian sand low embankment foundation increases greatly.
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Key words:
- low embankment /
- gravel soil /
- aeolian sand /
- stress /
- strain
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表 1 砾类土和风积沙的粒径分布
粒组尺寸/mm 粒组含量/% 砾类土 风积沙 40～20 14.5 20～10 22.6 10～5 17.8 5～2 13.6 2～1 6.7 1～0.5 7.9 0.5～0.25 6.5 15.4 0.25～0.075 5.8 81.7 <0.075 4.6 2.9 
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表 2 试验加载工况
地基含水率/% 静载/kN 短时动载 长时动载 峰值/kN 频率/Hz 作用次数 峰值/kN 频率/Hz 作用次数 18 50 50 3 100 50 3 10万 23 50 50 3 100 50 3 10万 28 50 50 3 100 50 3 10万
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