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

LEI Guo-hui; SONG Xiu-guang; PAN Wei-zong; ZHAO Cheng-zhong

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

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- Study of time lag problem of piezometric level observations using open standpipes
- Vol. 28, Issue 11, (2007)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU413.7
- Online First：18 October 2013，
  
  Published：2007
- 稿件说明：
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LEI Guo-hui, SONG Xiu-guang, PAN Wei-zong, et al. Study of time lag problem of piezometric level observations using open standpipes[J]. 2007, 28(11).
DOI：

LEI Guo-hui, SONG Xiu-guang, PAN Wei-zong, et al. Study of time lag problem of piezometric level observations using open standpipes[J]. 2007, 28(11). DOI：

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。

Abstract

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.

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