CAJ | 학술논문

为了更好地研究一种新的施工工艺下微型桩的承载性状，选用两根微型桩做现场静载试验，每根桩中12个振弦式钢筋应力计被均匀布置于微型桩中．通过静载试验的结果发现，微型桩在承受抗压及抗拔时最终呈刺入破坏或桩身被拔出．土层性状和桩土相对位移对微型桩侧阻的发挥有很大关系，桩身侧阻随桩土相对位移变化呈应变硬化关系．不同土层及同一土层受力状态不同时，桩的临界侧阻和临界位移各不相同．通过将微型桩实测单位侧阻与静力触探试验结果对比分析发现，抗压时实测单位侧阻为静力触探试验的锥尖侧阻平均值的0.57～0.99倍，抗拔时实测单位侧阻为静力触探试验的锥尖侧阻平均值的0.37～0.72倍．抗压桩实测单位锥尖端阻为静力触探试验结果的0.38倍．
위료경호지연구일충신적시공공예하미형장적승재성상，선용량근미형장주현장정재시험，매근장중12개진현식강근응력계피균균포치우미형장중．통과정재시험적결과발현，미형장재승수항압급항발시최종정자입파배혹장신피발출．토층성상화장토상대위이대미형장측조적발휘유흔대관계，장신측조수장토상대위이변화정응변경화관계．불동토층급동일토층수력상태불동시，장적림계측조화림계위이각불상동．통과장미형장실측단위측조여정력촉탐시험결과대비분석발현，항압시실측단위측조위정력촉탐시험적추첨측조평균치적0.57～0.99배，항발시실측단위측조위정력촉탐시험적추첨측조평균치적0.37～0.72배．항압장실측단위추첨단조위정력촉탐시험결과적0.38배．
In order to give a better insight into the behavior of a new type of micropile under compression and tension load,a load test program comprising two micropiles was conducted. Each pile was instrumented with 12 vibrating-wire strain gauges. The results show that failure occurs in plugging and pull-out manners under compression and ten-sion conditions,respectively. The soil properties and pile-soil relative displacement have great influence on the mobi-lization of shaft resistance. The relationship between shaft resistance and pile-soil relative displacement resembles the strain hardening model. Meanwhile,the critical displacement and the corresponding shaft resistance vary with soil profile and local stress state. Through a comparison with the average CPT sleeve friction,the measured shaft resis-tance is found to be 0.57-0.99 times the average CPT sleeve friction in compression and 0.37-0.72 times in tension,and the measured toe resistance is 0.38 times the average of CPT toe resistance.