湛江深厚老黏土地区钢管桩沉桩规律
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Regularity of pile-sinking construction for steel tube piles in Zhanjiang deep old deposited soil
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    摘要:

    对湛江老黏土地基5个工程钢管桩施工进行总结,得出以下结论:老黏土地区持力层宜选择50击的中粗砂层或者40击以上黏土层,此时基桩承载力恢复系数为1.26~1.40,比一般黏性土高;打桩锤宜选择D128、D138柴油锤,二档档位终锤贯入度宜为2~5 mm击,三档档位终锤贯入度为6~10 mm击,能量传递系数为28.5%~47.6%;当持力层和桩锤符合上述情况时,直径在1 000~1 400 mm的钢管桩总锤击数小于2 500的占统计83.8%,打桩效率最高。

    Abstract:

    Based on summarizing sinking construction for steel tube piles in deep old deposited soil of 5 projects,conclusions are as follows.The bearing stratum of steel tube pile in deep old deposited soil should be medium coarse sand of 50-blow count SPT or deep old deposited soil of 40-blow count SPT.The coefficient of restitution for pile capacity is 1.26~1.40 and higher than other caly soil.Diesel hammer of D128 or D138 should be chosen for pile driving equipment.The final set should be 2~5 mmblow for second gear and 6~10 mmblow for third gear.Energy transfer coefficient for steel tube piles in deep old deposited soil is 28.5%~47.6%.The total number of blows less than 2 500 is 83.8% of the statistics steel tube piles with diameter 1 000~1 400 mm and pile driving efficiency is highest when the bearing stratum and final set is as above-mentioned.Furthermore,the control standard of pile-sinking construction soil can give instruction to theoretical research and engineering practice for steel tube pile in deep old deposited.

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陈章宇,冯光华,丁树清.湛江深厚老黏土地区钢管桩沉桩规律[J].水运工程,2015(3):183-188.

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  • 在线发布日期: 2015-03-20
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