人民长江
人民長江
인민장강
YANGTZE RIVER
2015年
16期
62-66
,共5页
马永峰%周丁恒%邴启超%周训军
馬永峰%週丁恆%邴啟超%週訓軍
마영봉%주정항%병계초%주훈군
地基处理%PHC管桩%现场试验%大型炼厂
地基處理%PHC管樁%現場試驗%大型煉廠
지기처리%PHC관장%현장시험%대형련엄
foundation treatment%PHC pipe piles%in-situ test larger-scale refinery
针对大型炼厂工程软弱地基处理的复杂性,开展了PHC管桩的现场试验,完成了PHC管桩施工后的低应变、高应变动力测试及单桩水平、抗压静载荷试验。基于低、高应变测试结果分析了桩身质量及完整性；以高应变测试和静载荷试验结果验证了单桩承载能力；对不同桩径的PHC管桩经济性做了比较分析。静载荷试验结果表明,PHC管桩单桩承载力能达到设计要求；PHC管桩桩径为400 mm时,桩长对单桩极限承载力影响较大,桩径为500 mm或600 mm时,桩长影响较小；同一桩长的单桩极限承载力随桩径增大而增大,不同桩长的增大形式存在差异；灌芯桩比不灌芯桩单桩水平承载力提高50%以上；从经济角度考虑,抗压PHC管桩首选?500,桩端持力层选择强风化-中风化泥岩或全风化-中风化砂岩为宜。
針對大型煉廠工程軟弱地基處理的複雜性,開展瞭PHC管樁的現場試驗,完成瞭PHC管樁施工後的低應變、高應變動力測試及單樁水平、抗壓靜載荷試驗。基于低、高應變測試結果分析瞭樁身質量及完整性；以高應變測試和靜載荷試驗結果驗證瞭單樁承載能力；對不同樁徑的PHC管樁經濟性做瞭比較分析。靜載荷試驗結果錶明,PHC管樁單樁承載力能達到設計要求；PHC管樁樁徑為400 mm時,樁長對單樁極限承載力影響較大,樁徑為500 mm或600 mm時,樁長影響較小；同一樁長的單樁極限承載力隨樁徑增大而增大,不同樁長的增大形式存在差異；灌芯樁比不灌芯樁單樁水平承載力提高50%以上；從經濟角度攷慮,抗壓PHC管樁首選?500,樁耑持力層選擇彊風化-中風化泥巖或全風化-中風化砂巖為宜。
침대대형련엄공정연약지기처리적복잡성,개전료PHC관장적현장시험,완성료PHC관장시공후적저응변、고응변동력측시급단장수평、항압정재하시험。기우저、고응변측시결과분석료장신질량급완정성；이고응변측시화정재하시험결과험증료단장승재능력；대불동장경적PHC관장경제성주료비교분석。정재하시험결과표명,PHC관장단장승재력능체도설계요구；PHC관장장경위400 mm시,장장대단장겁한승재력영향교대,장경위500 mm혹600 mm시,장장영향교소；동일장장적단장겁한승재력수장경증대이증대,불동장장적증대형식존재차이；관심장비불관심장단장수평승재력제고50%이상；종경제각도고필,항압PHC관장수선?500,장단지력층선택강풍화-중풍화니암혹전풍화-중풍화사암위의。
The soft foundation treatment of large-scale refinery is very complex. In view of this condition, a series of in-situ tests of PHC pipe pile, including low/high strain dynamic test, horizontal and compressive static load test of single pile, were carried out. Based on results of low/high strain test, the quality and completeness of the pile was analyzed. The bearing capacity of single pile was verified by re-sults of high strain test and static load test. And some economical comparison was carried out among various piles of different diameter. The results of static load test showed that the bearing capacity of single pile has reached the standards; when the diameter of PHC pipe pile is 400mm, the ultimate bearing capacity of single pile is affected by pile length greatly;however for PHC pipe pile of 500 mm or 600 mm, the influence from pile length is smaller;the ultimate bearing capacity of single piles that have the same length increases with pile diameter, and the increasing forms are different among piles of various length;the horizontal bearing capacity of PHC pipe pile with concrete core is 50%larger than that of pile without concrete core;In economic terms, the best choice for compressive PHC pipe pile is ?500 type, the bearing strata of PHC pipe piles should be intensively-weathered to medium-weathered mudstone or completely-weathered to medium-weathered sandstone.
