RT - Journal Article T1 - Investigation of Compaction Effort and Types of Clay Mineralogy on Internal Erosion Through Core and Foundation of Earth Dam JF - JSTNAR YR - 2012 JO - JSTNAR VO - 16 IS - 61 UR - http://jstnar.iut.ac.ir/article-1-2427-en.html SP - 31 EP - 43 K1 - Earth dam K1 - Internal Erosion K1 - Clay mineralogy K1 - Na Montmorillonite K1 - Compaction effort. AB - Internal erosion is the second major reason for earth dam's failure after overtopping. One of the effective factors in internal erosion in earth dams is the clay minerals used in dams as well as the effects of compaction efforts on soil in sample preparation. In this research, internal erosion and the effect of clay minerals and compaction effort on internal erosion were investigated. For this purpose, Kaolin clay and Na Montmorillonite (Bentonite) separately and with different percentages of mixture were used to investigate the effect of different percentages of Bentonite on internal erosion. Two hammers of standard compaction and modified compaction test were also used to investigate different compaction efforts in internal erosion. The results showed that as compaction effort increased in constant water content, erodibility also increased to about 3%. In addition, it is found that erodibility of kaolin clay is more than bentonite, which reaches 65%. Finally, by adding 12% bentonite to kaolinite, erodibility decreased to a great extent. LA eng UL http://jstnar.iut.ac.ir/article-1-2427-en.html M3 ER -