Research On Application Of Comprehensive Compaction Technology To High Embankment Of Loess Filler

With the rapid development of China’s economy，the scale and constructionspeed of high-grade highway accelerated gradually, in the west region of China,especially in Shanxi. Due to the complex landform and physiognomy, so thereare many technical problems in design and construction. Highway requires highindex, in this case, the phenomenon of high fill and digging seems inevitableand a lot of high embankment of loess filler has emerged. Modern transportationhas the characteristics of high density, high speed, and heavy load. Therequirement of high fill embankment structure layer is becoming more andhigher. In order to improve driving conditions and ensure the safety of thevehicle traveling at high embankment, high embankment must keep enoughflatness, strength, stiffness and stability. Practice has proved that， according toa high standard for high embankment compaction are the most effectivetechnological measures, which can improve the compaction degree offilling,ensure adequate strength and stability of the embankment. Within theconstraints of the construction site and period, vibratory and impact compactioncannot effectively impact on the high embankment compaction. Therefore weneed to update the compaction technology, strengthen the compaction process. Acomprehensive compaction technology which is satisfied with high embankmentof loess filler is discussion and research, which has important practical significance to improve the quality of compaction and compaction efficiency.Taking the Yan jia feng section of Tai hang Road in Taiyuan as the researchelements, a comprehensive compaction technology which is integrating layeredroller compacted with heavy tamping, to high embankment of loess filler isproposed and applied. Firstly, the compaction characteristics, degree ofcompaction, collapsibility and compressibility of loess filler was deeplyanalyzed by laboratory soil test. Secondly, settlement deformation rule of thetotal settlement and the amount of compression on the fill section, which is onthe transverse section and longitudinal section of typical, were deeply analyzedby monitoring of profound layer settlement. Thirdly, the influence of terrain onthe effect of comprehensive compaction technology was deeply analyzed bysettlement deformation rule of two sections which is filling the same height butdifferent terrain. Finally, compaction characteristics, compaction actionmechanism by heavy compaction and the comprehensive compaction effect ofloess filler were deeply analyzed by laboratory soil test and monitoring ofprofound layer settlement.It is indicated by the results of the laboratory soil test that the compactiondegree and compressive modulus of soil mass (already compacted layer) gainssubstantial increase after the supplemented heavy compaction, which vary inperiodical half-wave form along with the filling depth. The collapsibility ofHigh Embankment of Loess Filler has been eliminated. It is indicated by theresults of the monitoring of profound layer settlement that the post-constructionsettlement to high embankment can be reducing obviously. Compared withconventional layered roller compacted can reduce the settlement of more than20%. The preloading settlement period decreases as a result of the smallerpost-construction settlement. Post-construction settlement is the main part of thesettlement of embankment. The amount of compression on the fill section isvery close to the total settlement of embankment. The Settlement of compositefoundation is about15%or less to the total settlement of high embankment. We should pay more attention to the U-Shaped Arc Surface in the process ofcompaction. Improve the degree of compaction and other related parameters ofU-ShapedArc Surface of high fill embankment.