HYDRAULIC CONDUCTIVITY ASSESSMENT OF SLURRY WALL USING PIEZOCONE TEST
HYDRAULIC CONDUCTIVITY ASSESSMENT OF SLURRY WALL USING PIEZOCONE TEST
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DOI：
10.1061/(asce)0733-9410(1994)120:10(1725
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发表时间：
1994-10
期刊：
影响因子：
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通讯作者：
M. Manassero
中科院分区：
文献类型：
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作者：
M. Manassero
在防渗墙内进行带孔隙压力（u）测量的静力锥贯入试验（CPT）或压孔试验（CPTU），以防止污染地下水。防渗墙的防渗材料是一种典型的水泥-膨润土（CB）自硬浆体，其组成为76.8%的水，19.2%的高炉水泥，4%的钠基膨润土。提出了一个用水力传导系数（k）解释CPTU的初步框架。特别地，试图通过结合压锥贯入参数（即，总点阻力（q[sub t]）、孔隙压力增量（[Delta]u）和套筒摩擦力（f[sub s]））。所获得的K值与CPTU消散试验、原位钻孔渗透试验和对同一CB混合物进行的实验室试验结果相当。测试结果表明，CPTU是一个很有前途的工具，在现场质量控制的防渗墙的实际水力传导率的评估完成的防渗墙，并在一定程度上，检测和定位水力缺陷，在许多情况下，是现场性能差的主要原因。
Cone-penetration tests (CPTs) with pore pressure (u) measurement or piezocone tests (CPTUs) are carried out inside a cutoff wall for polluted-groundwater containment. The backfilling material for the cutoff wall is a typical cement-bentonite (CB) self-hardening slurry whose composition is 76.8% water, 19.2% blast furnace cement, and 4% sodium bentonite. A tentative framework for interpretation of CPTUs in terms of hydraulic conductivity (k) is developed. In particular, a continuous assessment of hydraulic conductivity along a vertical profile is attempted by combining the piezocone penetration parameters (i.e., total point resistance (q[sub t]), pore-pressure increment ([Delta]u), and sleeve friction (f[sub s])). The obtained k results are comparable with results from CPTU dissipation tests, in-situ borehole infiltration tests, and laboratory tests performed on the same CB mixture. The test results indicate that the CPTUs are a promising tool for in-situ quality control of cutoff walls in terms of evaluating the actual hydraulic conductivity of the completed cutoff wall and, to some extent, of detecting and locating hydraulic defects that, in many cases, are the main causes of poor in-situ performance.