公路工程
公路工程
공로공정
JOURNAL OF HIGHWAY ENGINEERING
2014年
2期
9-12,20
,共5页
卸载标准%超载高度%软土层厚度%有限元模拟
卸載標準%超載高度%軟土層厚度%有限元模擬
사재표준%초재고도%연토층후도%유한원모의
unloading control standards%preload height%soft soil thickness%finite element simu-lation
根据“佛山一环”沉降观测数据和地质勘查资料,通过模拟分析不同预压载荷、软土层厚度下路基土的沉降变形规律,对排水固结法处理路段的卸载标准问题进行分析。结果表明,满载预压时间相同时,累计沉降量和沉降速率随超载高度、软土层厚度的增加而增大;增加超载高度能缩短预压时间,根据剩余沉降量确定卸载标准时应考虑载荷增加对路基计算深度的影响;排水体系正常工作条件下,等载预压满6个月、沉降速率小于5 mm/月,工后沉降通常小于300 mm;当欠载高度超过1 m时,单靠延长预压时间难以使路段的工后沉降量满足要求。
根據“彿山一環”沉降觀測數據和地質勘查資料,通過模擬分析不同預壓載荷、軟土層厚度下路基土的沉降變形規律,對排水固結法處理路段的卸載標準問題進行分析。結果錶明,滿載預壓時間相同時,纍計沉降量和沉降速率隨超載高度、軟土層厚度的增加而增大;增加超載高度能縮短預壓時間,根據剩餘沉降量確定卸載標準時應攷慮載荷增加對路基計算深度的影響;排水體繫正常工作條件下,等載預壓滿6箇月、沉降速率小于5 mm/月,工後沉降通常小于300 mm;噹欠載高度超過1 m時,單靠延長預壓時間難以使路段的工後沉降量滿足要求。
근거“불산일배”침강관측수거화지질감사자료,통과모의분석불동예압재하、연토층후도하로기토적침강변형규률,대배수고결법처리로단적사재표준문제진행분석。결과표명,만재예압시간상동시,루계침강량화침강속솔수초재고도、연토층후도적증가이증대;증가초재고도능축단예압시간,근거잉여침강량학정사재표준시응고필재하증가대로기계산심도적영향;배수체계정상공작조건하,등재예압만6개월、침강속솔소우5 mm/월,공후침강통상소우300 mm;당흠재고도초과1 m시,단고연장예압시간난이사로단적공후침강량만족요구。
Combined with the settlement observation data of Foshan one ring road,by the way of settlement simulation of different preload height and different soft soil thickness,the unloading control standards for the section treated by drainage consolidation method was studied in this paper.Based on these results,some useful conclusions are drawn from the discussion and analysis.The total settlement and post-deposition settlement velocity increases with the raise of preload height and soft soil thickness in the condition of preloading time equality.Raise the preload height can be helpful to shorten the preload-ing time,but the increased settlement caused by the increased load must be considered if the unloading control standards are determined by the residual settlement.If the drainage system can work normally, the equal preloading period at least six month and the settlement velocity is less than 5 mm per month,the post-construction settlement always less than 300 mm.Post-construction settlement can not meet the re-quirements if the preload height shorten more than 1 m by the way of extend preloading time alone.