軟土路基外文翻譯--論公路路基施工技術(shù)-公路隧道-文庫吧資料
2025-05-21 15:45本頁面
【正文】 idation and paction of soil paction to achieve the purpose of soil reinforcement. Impact paction technique is only suitable for shallow and marshy nature of collapsible loess foundation treatment, and its effective impact on the depth of not more than 80cm, punch a few times to 30 times or so. In the stamping process of construction should be noted: to maintain the optimum moisture content。s climate, bined with the construction of such fill and cut Fang Pingheng to select the construction method. 2 roadbed fill pressure Road subgrade strength and subgrade stability largely depends on the nature and degree of paction. Starting from the existing conditions, requirements and pacted fill to improve conditions is to ensure the quality and costeffective way to subgrade. subgrade The existing roadbed design specification (hereinafter referred to as norms) provides for the embankment fill requirements. The minimum strength of the subgrade and the maximum size for a quantitative standard, using Bearing Ratio test (CBR) value of the strength of the subgrade soil characterization, the introduction of the concept of the road bed. Of fill material for road beds proposed restrictions, highway and a road surface at the end of the following 0cm30cm road bed fill, the CBR value should be greater than 8, the next road on the bed and fill the following provisions also give the corresponding value. Subgrade paction The current roadbed construction, generally with a large tonnage of rollers, rolling effect has been significantly improved. For improving the degree of paction of subgrade soil played a positive role. Specification of the underside of the highway 150cm part of the road embankment paction degree must ≥ 95%, when the paved road to the other senior level surface, 7 its degree of paction should also highway and a class road from the criterion used. In addition, it increased the degree of paction of the embankment base of not less than 93% of the requirement. With the rapid development of highway roadbed construction technology has also made considerable progress, for special subgrade treatment technology has bee mature and improve. (1) wet areas embankment filling pressure. Through wet soil filling the foundation is relatively simple, monly used to fill gravel cushion and processing shop geogrid method is simple, the treatment effect is better. However, paction of subgrade is very difficult to regulate a number of adjustments to this: First, the standard paction test data can be determined according to or lower than the tabulated value of 23 percentage points。 ① 石砌的重力式擋土墻多用于石料豐富、墻高較低、地基較好的場合； ② 鋼筋混結(jié)構(gòu)的懸臂式擋土墻、扶壁式擋土墻和板柱擋土墻其受力比較合理，墻身圬工體積小，也已廣泛應(yīng)用于公路路基的防護(hù)； ③ 垛式擋土墻易于調(diào)整墻的高度，并采用預(yù)制構(gòu)件拼裝，是一種特殊形式的擋土墻。 （ 3）支擋防護(hù)。 （ 2）沖刷防護(hù)。破裂的 或易于風(fēng)化破碎的巖石路塹邊坡采用錨桿掛鐵絲網(wǎng)或高強(qiáng)塑料網(wǎng)格噴漿或噴射混凝土以及噴射纖維混凝土防護(hù)也有較好的效果?，F(xiàn)在，種草防護(hù)技術(shù)應(yīng)用較為廣泛，邊坡較高則采用
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