地震工程学报
地震工程學報
지진공정학보
China Earthquake Engineering Journal
2015年
1期
16-20,33
,共6页
砂土液化%人工激振%现场试验%方法
砂土液化%人工激振%現場試驗%方法
사토액화%인공격진%현장시험%방법
soil liquefaction%artificial dynamic loading%in-situ test%method
基于现场开展土体液化问题研究势必成为今后土动力学中的一个重要发展方向。目前人工激振下的现场液化试验方法还不够成熟,尚需进一步探索和发展。本文从试验设备组成、场地地震动激励、试坑布置、饱和砂土模型制备、数据测量与采集等5个方面论述该方法中的主要技术问题。研究表明：动力加载系统激励产生的地震动在0~7 m/s2；系统工作频率13~15 Hz,饱和砂土模型与基础边缘的距离在0.5~2.5 m 范围内,更适合进行液化试验；应用水沉法现场制备饱和砂土模型,要重点注意试坑防水和尺寸定位的问题；数据测量与采集中要充分考虑对现场液化问题认识不够这一因素的影响,需对数据测量与采集提出附加要求；试验实例初步表明,该方法可行,适合开展液化问题研究。
基于現場開展土體液化問題研究勢必成為今後土動力學中的一箇重要髮展方嚮。目前人工激振下的現場液化試驗方法還不夠成熟,尚需進一步探索和髮展。本文從試驗設備組成、場地地震動激勵、試坑佈置、飽和砂土模型製備、數據測量與採集等5箇方麵論述該方法中的主要技術問題。研究錶明：動力加載繫統激勵產生的地震動在0~7 m/s2；繫統工作頻率13~15 Hz,飽和砂土模型與基礎邊緣的距離在0.5~2.5 m 範圍內,更適閤進行液化試驗；應用水沉法現場製備飽和砂土模型,要重點註意試坑防水和呎吋定位的問題；數據測量與採集中要充分攷慮對現場液化問題認識不夠這一因素的影響,需對數據測量與採集提齣附加要求；試驗實例初步錶明,該方法可行,適閤開展液化問題研究。
기우현장개전토체액화문제연구세필성위금후토동역학중적일개중요발전방향。목전인공격진하적현장액화시험방법환불구성숙,상수진일보탐색화발전。본문종시험설비조성、장지지진동격려、시갱포치、포화사토모형제비、수거측량여채집등5개방면논술해방법중적주요기술문제。연구표명：동력가재계통격려산생적지진동재0~7 m/s2；계통공작빈솔13~15 Hz,포화사토모형여기출변연적거리재0.5~2.5 m 범위내,경괄합진행액화시험；응용수침법현장제비포화사토모형,요중점주의시갱방수화척촌정위적문제；수거측량여채집중요충분고필대현장액화문제인식불구저일인소적영향,수대수거측량여채집제출부가요구；시험실례초보표명,해방법가행,괄합개전액화문제연구。
Research on soil liquefaction under in-situ conditions will be an important branch in soil dynamics.At present,in-situ liquefaction test under artificial dynamic loading remains at the re-search stage;there have been only a few studies.This paper presents a method for in-situ liquefac-tion test based on a remolded saturated sand model.Many technological problems related to this method are discussed,which include five parts:(1)test apparatus,(2)ground motion stimulation, (3)test pit arrangement,(4)saturated soil model preparation,and (5)data measurement and ac-quisition.An in-situ liquefaction test using this method was performed in this study.The surface soil acceleration and pore water pressure data indicate that soil liquefaction occurs under artificial dynamic loading.The main points are:(1)A dynamic loading system can simulate strong ground motion with an acceleration from 0 to 7 m/s2 .(2)Under a loading frequency of 13 Hz to 15 Hz, the soil liquefaction test can be performed relatively easily when the distance between the soil model and loading base is 0.5 m to 2.5 m.(3)Measurement positioning and water-proofing are key factors during the preparation of the saturated soil model.(4)More request in data measurement and acquisition should be raised because of little acknowledges for soil liquefaction at site.(5)Ex-perimental results indicate that this technology is practically feasible.Studies on special liquefac-tion problems can be performed using this method.It also paves the path for further studies on geotechnical in-situ testing techniques under artificial dynamic loading.
