CAJ | 학술논문

在高层建筑单桩复合地基原位载荷试验的基础上，深入地分析了加载过程中桩土应力比、荷载分担比及承载力的发挥情况。结果表明，当地基承载力较大时设置100mm厚的褥垫层是可行的，能有效地发挥土的承载潜力，否则垫层厚度需要＞100mm。而且桩间土的承载力发挥先于桩，在桩屈服前桩土应力比n随着荷载的增加而增加，最后相对稳定，特征值荷载时应力比n平均为19?33。由于桩的挤土、围箍效应等使土的承载能力得到很大提高，随着荷载增加其效果更明显。在特征值荷载时，桩土的承载能力发挥系数平均值分别为0?72，1?78，极限状态时分别为1?62，2?96。
재고층건축단장복합지기원위재하시험적기출상，심입지분석료가재과정중장토응력비、하재분담비급승재력적발휘정황。결과표명，당지기승재력교대시설치100mm후적욕점층시가행적，능유효지발휘토적승재잠력，부칙점층후도수요＞100mm。이차장간토적승재력발휘선우장，재장굴복전장토응력비n수착하재적증가이증가，최후상대은정，특정치하재시응력비n평균위19?33。유우장적제토、위고효응등사토적승재능력득도흔대제고，수착하재증가기효과경명현。재특정치하재시，장토적승재능력발휘계수평균치분별위0?72，1?78，겁한상태시분별위1?62，2?96。
The in-situ loading tests were carried out. According to the results,the pile-soil stress ratio, load sharing ratio and exerting degree of bearing capacity were deeply analyzed. The results show that the cushion thickness can be 100mm, but the bearing capacity of soil can’t be exerted if cushion is not set. The pile’ s working delay and the pile-soil stress ratio n increases along with the increase of load before the pile yield, and become relatively stable finally, the average value of stress ratio is 19?33 in the working state. Due to the extruding effect and the compacting effect, the bearing capacity of the soil is greatly enhanced, and the effect is more obvious with the load increasing. When the load reaches the bearing capacity eigenvalue of composite foundation, the average value of efficiency factor of pile and soil is 0?72 and 1?78 respectively. In the ultimate state the efficiency factor is 0?72 and 1?78.