陕西地质
陝西地質
협서지질
GEOLOGY OF SHAANXI
2012年
1期
65-69
,共5页
赵跃文%王佳武%李敏杰%王锋涛%张少林%张波
趙躍文%王佳武%李敏傑%王鋒濤%張少林%張波
조약문%왕가무%리민걸%왕봉도%장소림%장파
渭南市%灌注桩%后压浆%压浆参数%地基加固
渭南市%灌註樁%後壓漿%壓漿參數%地基加固
위남시%관주장%후압장%압장삼수%지기가고
Weinan city%bored pile%post-grouting%mud-jack parameter%foundation strengthening
近年来我国的高层建筑迅猛发展,对地基承载力的要求越来越高,高层建筑的基础形式一般采用灌注桩基础。为了满足设计要求;灌注桩的持力层要求是较为完整的岩石层或承载力较高的卵石层,桩长和桩径尺寸往往很大,使得地下部分的造价在整个工程总造价中占较大的比例;同时;由于桩长很长,也给施工造成很大的困难。渭南市某工地采用φ300mm桩径,桩长30m,试桩施工完成后,经过桩基检测,桩的承载力不能满足上部荷载的要求,其后采用后压浆法来提高桩的侧摩阻力和桩端承载力,从而使灌注桩达到提高基桩承载力、减少基桩沉降的结果。
近年來我國的高層建築迅猛髮展,對地基承載力的要求越來越高,高層建築的基礎形式一般採用灌註樁基礎。為瞭滿足設計要求;灌註樁的持力層要求是較為完整的巖石層或承載力較高的卵石層,樁長和樁徑呎吋往往很大,使得地下部分的造價在整箇工程總造價中佔較大的比例;同時;由于樁長很長,也給施工造成很大的睏難。渭南市某工地採用φ300mm樁徑,樁長30m,試樁施工完成後,經過樁基檢測,樁的承載力不能滿足上部荷載的要求,其後採用後壓漿法來提高樁的側摩阻力和樁耑承載力,從而使灌註樁達到提高基樁承載力、減少基樁沉降的結果。
근년래아국적고층건축신맹발전,대지기승재력적요구월래월고,고층건축적기출형식일반채용관주장기출。위료만족설계요구;관주장적지력층요구시교위완정적암석층혹승재력교고적란석층,장장화장경척촌왕왕흔대,사득지하부분적조개재정개공정총조개중점교대적비례;동시;유우장장흔장,야급시공조성흔대적곤난。위남시모공지채용φ300mm장경,장장30m,시장시공완성후,경과장기검측,장적승재력불능만족상부하재적요구,기후채용후압장법래제고장적측마조력화장단승재력,종이사관주장체도제고기장승재력、감소기장침강적결과。
With the development of construction of high buildings in resent years, higher standards for foundation bearing capacity are required. Bored piles for foundation of high buildings are com- mon in China. In order to meet the requirements of construction design, bearing stratum of bored piles is required to be comparatively intact rocks or cobble layers with high bearing capacity. Piles with great length and big size increase the cost ratio of whole subgrade construction and difficulties in construction. At a construction site in Weinan city, bored piles with a diameter of 600 mm and a length of 30m were used in subgrade construction, which couldn't reach the requirements of load- bearing capacity above. Post pressure grouting of berehole is adopted for increasing side friction of piles and bearing capacity at pile ends, which could enhance the load-bearing capacity of subgrade piles and reduced the possibility of subsidence of subgrade piles.