自平衡樁基測試雙荷載箱技術(shù)的工程應(yīng)用
盧波1,2 龔維明2 戴國亮2
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(1 山東日照市規(guī)劃建設(shè)委員會，日照 276826； 2 東南大學(xué)土木工程學(xué)院，南京 210096)［摘要］自平衡試樁法是通過埋置于樁身中的荷載箱施加荷載的一種新型靜載試驗(yàn)方法。雙荷載箱技術(shù)即根據(jù)不同的設(shè)計(jì)要求，將兩個荷載箱埋置于樁身特定位置，按照不同的加載次序，分別測出指定樁段的極限承載力，可方便地確定有效樁長的實(shí)際承載力、樁壓漿前后的承載力、帶擴(kuò)大頭樁的承載力、基樁無側(cè)限抗壓強(qiáng)度等。工程應(yīng)用實(shí)例表明，雙荷載箱技術(shù)克服了單荷載箱測試中因平衡點(diǎn)確定不準(zhǔn)確而導(dǎo)致所測承載力偏低的問題，依據(jù)設(shè)計(jì)要求和樁周土層性質(zhì)，靈活組合加載次序可巧妙解決部分傳統(tǒng)試樁難以解決的問題。［關(guān)鍵詞］雙荷載箱技術(shù)；自平衡；極限承載力；加載順序；埋設(shè)位置Engineering application of selfbalanced pile loading test using double load cells techniqueLu Bo1,2, Gong Weiming2, Dai Guoliang2(1 Rizhao Planning and Urban Construction Committee, Rizhao 276826, China;2 College of Civil Engineering, Southeast University, Nanjing 210096, China)Abstract:Self-balanced loading test is a static load test method, in which load cell is embedded in the pile exerts load. Double load cell technique refers to meeting different designing needs. Two load cells are embedded in the specific position of the pile, and ultimate bearing capacity of specified pile is tested according to different loading sequence in order to efficiently determine the actual bearing capacity of efficient pile length, bearing capacity before and after grouting, bearing capacity of pile with expansion head, pile unconfined compressive strength and so forth. Examples of specific engineering practice indicate that the double load cells technique solves the problem that the middle balance point of single load cell is hard to be determined which lead to a lower measured bearing capacity of pile. According to the design requirements and soil layer property around pile, the double load cells can be loaded optionally and solve the problems in the tradition pile test.Keywords:double load cells technique; self-balanced; ultimate bearing capacity; loading sequence; embedding position作者簡介：盧波(1979-)，男，工學(xué)博士，一級注冊結(jié)構(gòu)工程師，通信地址：山東省日照市建設(shè)工程質(zhì)量監(jiān)督站，郵編：276826，E-mail:jiacheng79@126.com。
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