埋入式微型孔压计在真空预压模型试验中的应用  

Application of embedded micro pore water pressure gauges in model tests of vacuum preloading

作　　者：韩文君[1] 刘松玉[1] 章定文[1] 朱小丹[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《工程勘察》2012年第10期10-15,共6页Geotechnical Investigation & Surveying

基　　金：国家自然基金资助项目(51078083)

摘　　要：孔隙水压力的测量和分析对研究真空预压法具有重要意义。实际工程中的孔隙水压力计已经得到广泛应用,但是由于制造工艺上的限制,目前能用于真空预压室内模型试验的微型孔隙水压力计国内还比较少见。本文介绍了两种埋入式微型孔隙水压力计,利用自行设计和组装的仪器进行孔隙水压力计负压量程的标定,并进行了真空预压室内模型试验,从而评价微型孔隙水压力计的测量效果。标定试验结果表明,两种埋入式微型孔隙水压力计能准确地测量正压,并且对负压的测量结果精度也非常高。应用试验结果表明,排水板中的微型孔隙水压力计测量结果与膜下真空度变化规律一致;利用土体中的孔隙水压力计测量结果计算得到土体的固结度略小于由实测沉降数据计算的固结度,但变化规律一致,这充分说明这两种微型孔隙水压力计能够精确地测量真空预压中的负孔隙水压力。The measurement and analysis of pore water pressure is of great significance for the studies on the vacuum preloading. In practical engineering, the pore water pressure gauge has been widely used. However, due to restrictions of the manufacturing process, the micro pore water pressure gauge that can be used for vacuum preloading model tests in laboratory is still relatively rare in China. Two kinds of embedded micro-pore water pressure gauges are introduced. The design, fabrication and assembly of a new laboratory apparatus for the investigation of the fundamental behavior of the embedded micro-pore water pressure gauge measuring negative excess pore water pressure are presented in this paper. The results from the calibration tests show that the two kinds of embedded micro-pore water pressure gauges can accurately measure the pressure. The results from the model tests show that in micro-drain pore water the variation of the pressure measured by micro pore water pressure gauge in vertical drains agrees with the vacuum pressure under membrane. The percent consolidation of the soil calculated by the results from micro pore water pressure gauges is also agree with the results calculated from settlement, slightly smaller than that. The results indicate that the two kinds of micro-pore water pressure gauges could accurately measure the pore water pressure on vacuum preloading

关 键 词：孔隙水压计 埋入式 微型 真空预压 模型试验 

分 类 号：TU472[建筑科学—结构工程]