復(fù)雜地質(zhì)條件下的人工挖孔樁施工技術(shù).doc

復(fù)雜地質(zhì)條件下的人工挖孔樁施工技術(shù)

　　摘要：　在人工挖孔樁施工中，遇到淤泥、流砂層較厚，地下水極為豐富時，很容易涌砂塌孔，施工進度緩慢或根本無法成孔。本文主要介紹了在復(fù)雜地質(zhì)條件下的人工挖孔樁施工技術(shù)成功的經(jīng)驗，可供類似工程借鑒。
　　關(guān)鍵詞：　人工 挖孔樁 施工 技術(shù)
1 工程概況
　　茂名熱電廠5# 機冷卻水塔淋水面積達(dá)5500m2，高度達(dá)到120m，外型呈雙曲線形的特種結(jié)構(gòu)。冷卻水塔的環(huán)基基礎(chǔ)位于淤泥、沖質(zhì)粉質(zhì)粘土（砂層）及礫砂巖層，設(shè)計采用44根φ2000mm的人工挖孔樁來支持冷卻水塔的上部結(jié)構(gòu)，單樁深度在8.5m～16.5m之間，樁底要求進入微風(fēng)化巖層2000mm。
2 人工挖孔樁施工技術(shù)方案的選擇[1]
　　根據(jù)冷卻水塔區(qū)域的地質(zhì)報告和試樁情況綜合研究分析，44根人工挖孔樁中，約有一半左右位于淤泥、流砂
Under complicated geological conditions of manual digging Piles

Abstract: Dig a Hole in the manual, the encounter mud, sand flow thick, rich groundwater, it is easy to Bay sand hole collapse, construction progress is slow or not at all into the hole. This paper describes the complex geological conditions of artificial dig pile technical success of the experience for similar projects.
Keywords: Artificial Hole Piles
1 Project Overview
Maoming Thermal Power Plant Unit 5 cooling tower water spray area of 5500m2, height to 120m, is in the shape of special structure of the hyperbolic shape. Cooling towers in the mud ring and the foundation, red silty clay (sand) and gravel sandstone, designed with 44 φ2000mm of manual digging pile to support the upper structure of the cooling towers, pile depth of 8.5m ~ 16.5m between the pile and went to the breeze of rock 2000mm.
2 Drilled Piles of artificial selection programs [1]
According to the cooling towers to the geological report and comprehensive study of test piles, 44 piles of artificial excavation, about half in the mud, quicksand

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