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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第11期2369-2374,共6页
Rock and Soil Mechanics
关键词
渗压计
测压管
滞后
注水试验
灵敏度
piezometer
standpipe
time lag
rising-head test
degree of sensitivity
