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[來源:www.haradaip.com] [作者:淤泥固化] [日期:18-12-28]

(1)砂墊層:砂墊層為設置于路堤填土與軟土地基之間的透水性墊層,起排水的作用,從而保證了填土荷載作用下地基中孔隙水的順利排出,既加快了地基的固結,還可以保護路堤免受孔隙水浸泡。砂墊層多采用中、粗砂,厚度一般為0……6-1.Om,寬度(兩側)比路堤底寬0.5—1.Om.砂墊層的上下應設反濾層。砂墊層適用于施工期限不緊、路堤高度為極限高度的2倍以內、砂源豐富、軟土地基表面無隔水層的情況。當軟土層較薄,或軟土墊層底層又有透水層時,效果更好。砂墊層往往還與其他處治措施配合使用,如與塑料排水板、袋裝砂井、砂井等加固措施配合設置。 (1) Sand cushion: Sand cushion is a permeable cushion between embankment fill and soft soil foundation, which plays a drainage role, thus ensuring the smooth discharge of pore water in the foundation under the action of fill load, not only accelerating the consolidation of the foundation, but also protecting the embankment from pore water immersion. Sand cushion is mostly medium and coarse sand with a thickness of 0. 6-1.Om, the width (two sides) is 0.5 to 1.Om. wider than the bottom of the embankment, and the top and bottom of the sand cushion should be provided with reverse filter. Sand cushion is suitable for the construction period is not tight, the embankment height is less than 2 times the limit height, sand source is rich, the surface of soft soil foundation without water barrier. When the soft soil layer is thin, or the soft soil cushion and the permeable layer, the effect is better. Sand cushion is often used in conjunction with other treatment measures, such as plastic drainage board, bagged sand wells, sand wells and other reinforcement measures. (2)淺層處治:表層分布厚度小于3m的軟土時,可采用淺層拌和、換填、拋石等方法進行處治。 (2) Shallow treatment: Shallow mixing, filling, riprapping and other methods can be used when the surface distribution thickness is less than 3m. ①淺層拌和添料可用石灰等無機結合料,換填材料可用水穩性好的材料,如砂、礫、片石等滲水性材料或強度較高的粘性土。換土深度一般不宜超過2m. The shallow mixing and filling materials can be used as inorganic binders such as lime, and the filling materials can be used as water-stable materials, such as sand, gravel, gravel and other permeable materials or cohesive soil with higher strength. The depth of soil replacement should not exceed 2m. ②拋石擠淤是強迫換土的一種形式。拋石擠淤多采用不易風化石料,石料不宜小于30cm,且小于30cm粒徑含量不得超過20%.片石拋出水面后應用較小石塊填塞墊平,用重型機械壓實緊密,其上設反濾層。 2. Riprap squeezing is a form of forced soil replacement. Most of the rubble is made of non-weathering stone, and the stone should not be less than 30 cm, and the particle size of less than 30 cm should not exceed 20%. ③爆破排淤:可分先填后爆和先爆后填兩種施工方法。前者適用于稠度較大、相對不穩的軟土或泥沼,先填的路堤隨爆隨沉,避免回淤;后者適用于稠度小、回淤較慢的泥沼或軟土。實際施工中,也可以在爆破前備好填料,然后隨爆隨填,爆破一段,填筑一段。 3. Blasting dredging can be divided into two construction methods: first filling, then blasting and first blasting. The former is suitable for soft soils or marshes with high consistency and relative instability, and the embankment filled first sinks with explosion to avoid silting; the latter is suitable for marshes or soft soils with low consistency and slow silting. In actual construction, the filler can be prepared before blasting, and then filled with blasting, blasting a section, filling a section.

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