敞开型测压管水位监测的滞后时间问题研究  

Study of time lag problem of piezometric level observations using open standpipes

作　　者：雷国辉[1] 宋修广[2] 潘维宗[2] 赵承忠[3] 

机构地区：[1]河海大学岩土工程水利部重点实验室/岩土工程研究所,南京210098 [2]山东大学土建与水利学院,济南250061 [3]济南市人民政府防汛抗旱指挥部办公室,济南250014

出　　处：《岩土力学》2007年第11期2369-2374,共6页Rock and Soil Mechanics

摘　　要：分析了敞开型测压管在水位监测时产生滞后现象的机理,提出了一种简单新方法估算滞后时间,并与Hvorslev解答进行了对比。参数分析结果表明,所提出方法估算的滞后时间约为Hvorslev解答的1/5～1/10。当测压管进水段的长度足够时,敞开型测压管可以应用于渗透系数为10-5甚至10-6 cm/s的土体当中,而不会产生显著的滞后现象。通过28根敞开型测压管的现场注水试验,检验了测压管的灵敏度,并验证了分析结果的合理性。The mechanisms of the time lag phenomenon induced in piezometric level observations using open standpipes are analyzed. A new simple method is proposed to estimate the lag time; and it is compared with the Hvorslev＇s solution, It is found from parametric studies that the estimated lag time by the proposed method is about 1/5 to 1/10 of that by the Hvorslev＇s method. When the length of the intake portion of the standpipe is long enough, the open standpipes can be used in a soil with the coefficient of permeability of 10^5 or even 10^-6 cm/s, without inducing significant time lag phenomenon. The degrees of sensitivity of 28 open standpipes were examined by field rising-head tests; and the results from the proposed method are verified by the tested results.

关 键 词：渗压计 测压管 滞后 注水试验 灵敏度 

分 类 号：TU413.7[建筑科学—岩土工程]