某软土地基采用塑料排水板和水泥土搅拌桩处治后进行路基堆载,施工对邻近管线产生不利影响。利用ABAQUS有限元软件模拟施工过程,分析施工对管线造成的影响,提出对管线的保护措施,实测证明措施可行;同时分析了距坡脚不同距离处管线的变形及可行的保护措施。结果表明:软土处治后进行路基施工影响范围达到40 m;防护桩应选取靠近管线的位置埋置,同时需考虑桩施工影响;当5 m≤L(管线离坡脚距离)＜10 m时,在距坡脚2 m处使用变截面素混凝土桩保护;当10 m≤L＜15 m,在距坡脚6 m处使用素混凝土长桩保护;当15 m≤L＜20 m,在距坡脚12 m处使用素混凝土长桩保护;当20 m≤L＜25 m,在距坡脚16 m处使用变截面水泥土桩保护;当25 m≤L＜30 m,在距坡脚22 m处使用水泥土长桩保护;当30 m≤L＜35 m,在距坡脚27 m处使用水泥土长桩保护;当35 m≤L＜40 m,使用反压护道措施,应与路基堆载同时施工;当L≥40 m,管线处于安全状态,只需加强监测即可。
Abstract
A soft soil foundation treated with plastic drainage boards and cement-soil mixing piles prior to subgrade stacking may negatively affect neighboring pipelines. ABAQUS finite element software is employed to simulate the construction process and analyze its impact on the pipelines. Based on the analysis, pipeline protection measures are proposed and demonstrated feasible through field measurements. Additionally, the deformation of pipelines at various distances from the slope toe and corresponding suitable protection measures are examined. Results indicate that after soft soil treatment, the impact range of roadbed construction reaches 40 m. Protective piles shall be installed near the pipelines, and the effects of pile construction shall be considered simultaneously. The following protective measures are suggested based on the distance (L) between the pipeline and the slope toe: for 5 m≤L<10 m, plain concrete pile with variable section should be placed 2 m from the slope toe; for 10 m≤L<15 m, plain concrete long piles should be positioned 6 m from the slope toe; for 15 m≤L<20 m, plain concrete long piles should be placed 12 m from the slope toe; for 20 m≤L<25 m, variable-section cement-soil piles should be installed 16 m from the slope toe; for 25 m≤L<30 m, long cement-soil piles should be utilized 22 m from the slope; toe; for 30 m≤L<35 m, long cement-soil piles should be placed 27 m from the slope toe; for 35 m≤L＜40 m, back pressure protection road measures should be implemented simultaneously with subgrade piling; for L≥40 m, pipelines are in a safe state, requiring only enhanced monitoring.
关键词
软土路基 /
塑料排水板 /
管线 /
数值模拟 /
保护措施
Key words
soft soil subgrade /
plastic drainage board /
pipeline /
numerical simulation /
protection measures
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基金
山东省自然科学基金项目(ZR2022MD061)
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