Research Into The Stability And Settlement Of Stone-Replace-Silt Dike Under Explosion In Deep And Thick Silt

The explosive compaction of warping on the rocks is one of the widespread usedmethods in soft foundation treatment of both coastal engineering and trafficengineering, since it has those advantages, like rapid construction, low cost, goodutility. Traditional viewpoint is that the explosive compaction in the rock-filledprojects should achieve such effect that the debris was completely replaced. In effect,however, a lot of deep and thick silt was encountered by explosive compactionconstruction projects in Fujian coastal ports, and practice shows that the methodmentioned above usually could not achieve the desired effect. To be more exactly,there are debris mixed layer or pure silt layer at the bottom of the dike, which still hasunclear influence on the stability of projects; In addition, there is less research intopredicting the settlement of stone-replace-silt dike with complex section under deepand thick explosive compaction. This thesis deeply discusses the stability of dikeunder the effect of different debris replacement and the prediction of settlement ofstone-replace-silt dike with complex cross-section under explosion in deep and thicksilt, the main research results and conclusions are obtained as follows:1.By analyzing on the data obtained from experiment in project site and that haveexisted overseas, the mechanism of stone-replace-silt under the explosion in deep andthick silt was discussed.2.Basing on silt-compact dike engineering practice under explosion in deep andthick silt, five kinds of destabilizations and four kinds of stone-replace-silt patternsthat may happen to dike were discussed. Moreover, based on earth pressure theoryand slope stability analysis theory, models to calculate the possible patterns ofdestabilization of dike was formed.3.Based on four possible kinds of stone-replace-silt patterns, a dike stability finiteelement model was formed, after thorough analysis, evolutionary map of the mostdangerous sliding surface was obtained, which quantitatively verified relativeconclusions on dike stability.4.By analyzing the impact factors of dike stability under different stone-replace-silt pattern of the4thand the5thports in Fuzhou harbor and by combining artificialNeural Network and orthogonal design for the first time to analyze dike stability withmultiple sensitive factors, the rank of sensitive factors that impact silt-compact dikestability under explosion in deep and thick silt was obtained.5.The law of settlement of stone-replace-silt dike with complex section underexplosion in deep and thick silt was analyzed, besides, Wavelet theory was used towipe out noise and equal time-span of original data, then Verhulst prediction modelwas used to predict the evolution of dike settlement, as a result of it, final settlementof dike and the time to form were obtained.