眾多地盤改良工法中，動力夯實工法具有工期短、成本低、無汙染、設備簡單、施工容易等優點，本研究採用動力置換工法在煤灰塘進行施作，試驗中搭配多種變數豐富試驗數據，探討其對煤灰塘現地之工程性質，試驗變數包含夯錘形式、回填料、夯擊能量、夯擊方法等。動力置換工法主要是依據夯擊後回填料貫入數量與試驗後SCPT檢核，來進行改良探討，由現地試驗中得知灰塘上層8m屬於水上回填，回填密度較高強度較佳，主要受動力夯實DC作用改量；灰塘下層8m~12m屬於水下回填，由於自由沉降回填的關係密度強度都相對較低，主要受動力置換與動力夯實複合作用提升改良效果。
由現地試驗得知，動力夯實工法於灰塘施工，夯擊能量以小能量為主，如欲增加貫入體積提升改良效果，回填材料可搭配工程性質較佳顆粒較大之回填材料，夯擊方法應選用分段夯擊方式，有效控制隆起體積增且加貫入體積，最終可提升灰塘現地改良效益，如回填料為煤灰混礫石，將回填材料打入下方軟弱層，也可達到煤灰去化成效。

Many ground improvement construction method, the dynamic compaction construction methods have a short duration, low cost, non-polluting, simple equipment, easy construction, etc. this study dynamic replacement engineering methods in coal ash pond of Oxfam, experiments with a variety of variables rich test data, Discussion of its ash pond now to the nature of the project, test variable contains the rammer forms, backfill, tamping energy, tamping methods. Dynamic Replacement Method is mainly based on tamping after backfill penetration after the number of test SCPT seized nuclear, to discuss improvements, known from now to test the ash pond upper 8m belong Water backfill, backfill density high strength better, mainly by power reinforce the role of DC change amount; ash pond 8m ~ 12m lower part of the underwater backfill, since the relationship between the density of free settling backfill strength are relatively low, mainly due to the replacement power complex and dynamic compaction to enhance the role of improved results.
To learn from the current test, dynamic compaction construction method in ash pond construction, tamping energy to small energy-based, To increase penetration to enhance the effect of improving the volume, backfill material can be used with better engineering properties of larger particles of the backfill material, compaction methods should use segmented compaction methods to effectively control the raised volume increase and volume increase penetration, and ultimately enhance the ash pond can now be improved benefits, such as coal ash mixed gravel backfill, the backfill material into the weak layer underneath, coal ash can be reached go of the results.

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