共查询到18条相似文献,搜索用时 109 毫秒
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冻胀与翻浆是东北林区公路的常见病害,也是较难处理的病害。虽然引起冻胀与翻浆的原因很多,但主要是东北的林区公路路基内的水份,由于受负温差的影响,由温度高的深层沿着毛细孔向温度低的上层移动,并积聚在上层。当温度下降到冰点以下时,水变成冰,体积增大,导致冻胀病害发生;当春季温度升高时,路基上面先融化,水份因下层冻结无法向下层移动,引起翻浆。 相似文献
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路面翻浆是季节性冻土地区道路工程中的一个主要冻害现象之一;翻浆的发生,不仅会破坏路面,妨碍行车,严重者还会中断交通,造成一定的经济损失。本文就这一现象论述了高寒地区道路冻胀翻浆的防治方法。 相似文献
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本文记述了我省公路路基的主要病害—翻浆和冻胀阐述了其产生的原因及设计、施工中的预防措施,并对提高公路使用年限很有帮助。 相似文献
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季节性冰冻地区路基聚冰防治措施浅析 总被引:1,自引:0,他引:1
我国东北季节性冰冻地区的路基若土体中含有较多的水,在温度下降的时候,会发生程度不同的聚冰、冻胀现象。由于土体含水量、土体毛细作用的强弱及温度变化速度的不同,又将产生轻度冻胀直至翻浆等不同程度的病害。本文对季节性冰冻地区聚冰现象提出了一些防治措施及建议。 相似文献
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在公路设计中,必须确定合理的路基断面型式.本文提出了一种适用于平原低温地区的台阶形路基断面.计算分析表明,这种断面型式有利于改善路基的水温状况,可以防治或减轻季冻区的公路冻胀和翻浆,因而具有广泛的应用前途. 相似文献
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谈大气因素对林区道路的影响 总被引:1,自引:0,他引:1
由于林区道路路基和路面在野外露天,所以直接受风、雨、雪、温度的影响。例如道路的冻胀、翻浆、塌方等现象,都是直接由大气因素的变化所造成的,因此为减少和防止大气因素对道路的影响就必须研究其产生影响的根源。 相似文献
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赵焕辉 《内蒙古林业调查设计》1995,(1):22-24
翻浆破坏是林区公路路面主要破坏形式之一,特别是季节性冻土地区路面翻浆破坏更为严重。现将林区公路路面翻浆破坏产生的原因、造成的危害及防治措施作以研究、探讨。 相似文献
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France Goulet 《New Forests》1995,9(1):67-94
Soil frost heaving is the result of the formation of ice lenses in the soil caused by a segregation of the soil water. Ice lenses are growing from below and pushed upward. Seedlings heave when they are pushed out of the ground by the ice sheet formed at the surface of the soil. Frost heaving may greatly reduce growth and survival of forest tree seedlings particularly in regions where freezing and thawing are accompanied by high soil moisture. Resistance to frost heaving increases with size of seedling as the ability of a seedling to anchor itself increases. A few methods, such as fertilizing, choice of planting spots, sowing or planting at the proper time, shading, and use of mulches, appear to be effective in controlling frost heaving. Shade from natural plant cover can greatly reduce frost heaving. 相似文献
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季冻区路基土冻胀主要影响因素对冻深的影响规律 总被引:1,自引:0,他引:1
依托黑龙江省庆安冻土科学试验场,开展了不同土质冻胀量和冻深等的试验观测。根据试验和观测数据,分析土质、土的冻胀率及坡向与路基冻深的关系,得到3个主要影响因素对路基土冻深的影响规律,分析土质、冻胀率及地形坡向对路基冻深的影响程度。基于上述研究结论,提出土质、冻胀率及地形坡向对路基土冻深的修正系数。利用三个修正系数,可以实现对标准冻深的修正,计算路基的实际冻深,作为路基换填以及路面抗冻厚度设计的依据。 相似文献
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This study was carried out in northern Sweden to determine the effects of frost heaving on the establishment of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) seedlings in relation to planting methods. For this purpose, one year old containerised seedlings were planted on two sites and on two dates: during the spring (early planting) and during the fall (late planting). In each case, two planting depths (normal and deep planting) and four planting sites (in mineral soil in the depressions, in the scalp/trench area, on the top of the mound and in the untreated humus layer) were used. On each site, 50 seedlings were planted for each treatment. Frost heaving was observed and measured during two years. The amount of heaving was highest in the hole and almost insignificant on the top of the mound and in the humus layer. Planting depth influenced the degree of heaving only for Scots pine planted in the hole and was not related to the planting time. 相似文献