JGTS 2021/01
Volume 1, No.1 : 37-51
Backfill Filter of Various Soil Types for Groundwater Monitoring Well

Hong Yao-Ming a and Amit kumar sah b*
aProfessor, Master Program of Green Technology for Sustainability, Nanhua University, Chiayi County, Taiwan
bGradute Student, Master Program of Green Technology for Sustainability Development, Nanhua University, Chiayi County 622, Taiwan, sahamit644@gmail.com

Abstract: This study established the grain size distribution of backfill filter for groundwater monitoring well. Backfill filter is used to prevent the erosion of base soil such as silt and clay. Formation of backfill filter is determined by the ratio of silt and clay within base soil. Therefore, 6 types of soil sample were prepared with percentage of 10%, 20%, 30%, 50%, 70% and 90% of soil passing through the #200 sieve. Grain size distribution of Backfill filter can be obtained by Hong et. al. (2011). Proctor compaction test, which was used to simulate the pressure condition of base soil under the ground was executed to find Optimum Moisture Content (OMC). The design method of backfill filter is then tested by No Erosion Filter Test (NEFT), which is adopted to deploy filter grains to prevent piping when the high groundwater pressure applies on the crack. Results of these test can be referred for backfilling filters design method into the groundwater monitoring well and to find the lower and upper limit of D15 (diameter smaller than 15% filter grain size) on various soil type.

Keywords:  Backfill filter; Ground water monitoring well; No Erosion Filter Test; Piping; Packing Material; Grain size distribution.

*Corresponding author; e-mail: sahamit644@gmail.com
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