大潮差復雜地質(zhì)海上大直徑鉆孔樁施工關(guān)鍵技術(shù)研究
發(fā)布時間：2018-07-25 15:08
【摘要】：平潭海峽公鐵兩用大橋(B0~B58)為國內(nèi)首座跨海公鐵兩用大橋。大橋橋址處環(huán)境惡劣,風大、浪高、流急、水深、潮差大、地質(zhì)極其復雜,大橋施工難度為世界級。大橋下部樁基為大直徑鉆孔灌注樁,直徑達3.0m,嵌巖深度5.23~15m。樁基施工采用沖擊鉆反循環(huán)法成孔。由于橋址所在位置地質(zhì)條件復雜:巖層傾斜度大、覆蓋層厚度不均,高強度孤石(多為凝灰?guī)r)較多,鋼護筒打進難度較大,且由于本海域一日兩潮,最大潮差達7m,導致護壁泥漿與外部水、土壓差極難控制,使得鉆孔樁施工中發(fā)生的泥漿滲漏甚至塌孔問題,嚴重影響了施工速度和效率。針對平潭海峽公鐵兩用大橋(B0-B58)大直徑鉆孔灌注樁施工過程中漏漿、塌孔、軟硬巖層傾斜巖面鉆進等問題,采用理論分析、數(shù)值模擬、現(xiàn)場試驗等方法,研究了發(fā)生滲透破壞的破壞形式及漏漿部位,總結(jié)得到處理海上鉆孔樁漏漿的高壓旋噴注漿止水帷幕和填片石+粘土(水泥)堵漏法施工工藝,處理軟硬巖層傾斜巖面鉆進的回填片石法,并得到各種理論工程量計算公式。論文研究成果科學指導了平潭海峽公鐵兩用大橋(B0-B58)大直徑鉆孔灌注樁的施工,并提高了施工工效,對今后海洋工程施工具有重要的參考價值。
[Abstract]:Pingtan Strait dual-purpose Bridge (B0~B58) is the first cross-sea bridge. At the site of the bridge, the environment is harsh, the wind is strong, the wave is high, the current is quick, the water depth, the tidal range is large, the geology is extremely complex, and the construction difficulty of the bridge is world-class. The pile foundation in the lower part of the bridge is a large diameter bored pile with a diameter of 3.0 m and a rock-embedded depth of 5.23 ~ 15 m. The pile foundation construction adopts the impact drilling reverse circulation method to form the hole. Because of the complex geological conditions of the location of the bridge site, such as large slope of rock strata, uneven thickness of overburden, more high strength solitary rocks (mostly tuff), it is more difficult for steel guard tube to break into the water, and because of the two tides in this sea area, The maximum tidal difference is up to 7 m, which leads to the difficulty of controlling the difference between the mud and external water and the pressure difference between the soil and the wall, which makes the mud leakage or even the hole collapse in the construction of the bored pile occur, which seriously affects the construction speed and efficiency. Aiming at the problems of leakage, hole collapse and inclined rock surface drilling in the construction of large-diameter bored pile of B0-B58 Bridge in Pingtan Strait, this paper adopts theoretical analysis, numerical simulation, field test and other methods, such as theoretical analysis, numerical simulation, field test and so on. In this paper, the failure form and leakage site of seepage failure are studied, and the construction technology of high pressure rotary jet grouting waterproof curtain and flake clay (cement) plugging method for treating leakage grouting of offshore bored pile is summarized. This paper deals with the backfill flake method for inclined rock surface drilling in soft and hard rock formations, and obtains various theoretical engineering calculation formulas. The research results of this paper scientifically guide the construction of large-diameter bored cast-in-place piles in Pingtan Strait Bridge (B0-B58), and improve the construction efficiency, which has important reference value for the future construction of offshore engineering.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.551
本文編號：2144200
[Abstract]:Pingtan Strait dual-purpose Bridge (B0~B58) is the first cross-sea bridge. At the site of the bridge, the environment is harsh, the wind is strong, the wave is high, the current is quick, the water depth, the tidal range is large, the geology is extremely complex, and the construction difficulty of the bridge is world-class. The pile foundation in the lower part of the bridge is a large diameter bored pile with a diameter of 3.0 m and a rock-embedded depth of 5.23 ~ 15 m. The pile foundation construction adopts the impact drilling reverse circulation method to form the hole. Because of the complex geological conditions of the location of the bridge site, such as large slope of rock strata, uneven thickness of overburden, more high strength solitary rocks (mostly tuff), it is more difficult for steel guard tube to break into the water, and because of the two tides in this sea area, The maximum tidal difference is up to 7 m, which leads to the difficulty of controlling the difference between the mud and external water and the pressure difference between the soil and the wall, which makes the mud leakage or even the hole collapse in the construction of the bored pile occur, which seriously affects the construction speed and efficiency. Aiming at the problems of leakage, hole collapse and inclined rock surface drilling in the construction of large-diameter bored pile of B0-B58 Bridge in Pingtan Strait, this paper adopts theoretical analysis, numerical simulation, field test and other methods, such as theoretical analysis, numerical simulation, field test and so on. In this paper, the failure form and leakage site of seepage failure are studied, and the construction technology of high pressure rotary jet grouting waterproof curtain and flake clay (cement) plugging method for treating leakage grouting of offshore bored pile is summarized. This paper deals with the backfill flake method for inclined rock surface drilling in soft and hard rock formations, and obtains various theoretical engineering calculation formulas. The research results of this paper scientifically guide the construction of large-diameter bored cast-in-place piles in Pingtan Strait Bridge (B0-B58), and improve the construction efficiency, which has important reference value for the future construction of offshore engineering.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.551
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