岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2013年
3期
633-639
,共7页
赵晓彦%张京伍%梁瑶%蒋楚生%黄金河
趙曉彥%張京伍%樑瑤%蔣楚生%黃金河
조효언%장경오%량요%장초생%황금하
边坡工程%主被动组合锚固%设计方法%现场测试
邊坡工程%主被動組閤錨固%設計方法%現場測試
변파공정%주피동조합묘고%설계방법%현장측시
slope engineering%combined active/passive anchoring%design method%field investigation
花岗岩类土质边坡由于其较强的锚固能力,在高边坡加固工程实践中越来越多地采用锚索和锚杆组合锚固技术,但这种主被动组合锚固措施的设计方法尚不成熟.现有设计方法多仅考虑锚杆对边坡局部稳定性的贡献,而较少考虑其对边坡整体稳定性所起的作用,让锚索承担所有的剩余下滑力.故提出一种新的锚索/锚杆组合加固边坡的设计方法.该方法考虑锚杆对边坡整体稳定性的贡献,故提出锚索与锚杆受力的分配方法;通过降低锚索的主动锚固预应力,使边坡的变形调动锚杆的被动抗拔力,最终达到主被动锚协调作用的效果.与以往设计方法相比,所提方法可以减小锚索的设计吨位,从而减少钢铰线用量,节约工程造价;而且预应力减小可以降低钢铰线的应力腐蚀,提高锚索的长期稳定性.以国道 G323一花岗岩类土质边坡为例,通过现场锚杆轴力、锚索预应力及边坡地表位移的监测,论证所提设计方法的可行性.
花崗巖類土質邊坡由于其較彊的錨固能力,在高邊坡加固工程實踐中越來越多地採用錨索和錨桿組閤錨固技術,但這種主被動組閤錨固措施的設計方法尚不成熟.現有設計方法多僅攷慮錨桿對邊坡跼部穩定性的貢獻,而較少攷慮其對邊坡整體穩定性所起的作用,讓錨索承擔所有的剩餘下滑力.故提齣一種新的錨索/錨桿組閤加固邊坡的設計方法.該方法攷慮錨桿對邊坡整體穩定性的貢獻,故提齣錨索與錨桿受力的分配方法;通過降低錨索的主動錨固預應力,使邊坡的變形調動錨桿的被動抗拔力,最終達到主被動錨協調作用的效果.與以往設計方法相比,所提方法可以減小錨索的設計噸位,從而減少鋼鉸線用量,節約工程造價;而且預應力減小可以降低鋼鉸線的應力腐蝕,提高錨索的長期穩定性.以國道 G323一花崗巖類土質邊坡為例,通過現場錨桿軸力、錨索預應力及邊坡地錶位移的鑑測,論證所提設計方法的可行性.
화강암류토질변파유우기교강적묘고능력,재고변파가고공정실천중월래월다지채용묘색화묘간조합묘고기술,단저충주피동조합묘고조시적설계방법상불성숙.현유설계방법다부고필묘간대변파국부은정성적공헌,이교소고필기대변파정체은정성소기적작용,양묘색승담소유적잉여하활력.고제출일충신적묘색/묘간조합가고변파적설계방법.해방법고필묘간대변파정체은정성적공헌,고제출묘색여묘간수력적분배방법;통과강저묘색적주동묘고예응력,사변파적변형조동묘간적피동항발력,최종체도주피동묘협조작용적효과.여이왕설계방법상비,소제방법가이감소묘색적설계둔위,종이감소강교선용량,절약공정조개;이차예응력감소가이강저강교선적응력부식,제고묘색적장기은정성.이국도 G323일화강암류토질변파위례,통과현장묘간축력、묘색예응력급변파지표위이적감측,론증소제설계방법적가행성.
@@@@Combined anchoring technique of tiebacks and soil nails is frequently used in practice for stability of granitoid soil slopes due to their higher anchorage capacity. Despite the routine use,the existing design method for the combination remains however controversial,in which the soil nails are designed to enhance local stability rather than contribute to overall stability of the slopes. The tiebacks are always designed to balance the driving force of a slope. Thus,the current design method cannot reflect the advantages of the combination. Attempting to solve the problem,a new design method is presented,in which the contribution of the soil nails,as well as the tiebacks, to overall stability of a slope is taken into consideration. As a result of this consideration,the preload of the tiebacks decreases and the slope consequently moves(the quantity of the movement is very small) and the movement mobilizes the resistance force of soil nails. By this process,the passive and active anchors work harmoniously;and the stress corrosion possibility of the active anchors(tiebacks) is reduced due to the decreasing of the preload resulting in a better long-term stability. Also,the amount of the tiebacks may decrease,which can save the construction cost. A granitoid soil slope along G323 national highway in China is taken for example to validate the presented design method by the field investigations of preload in some tiebacks,the stress in some soil nails and the ground surface displacement.