桩板墙内侧土压力与工程特性研究
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摘要
从某客运专线桩板墙路基的受力特点出发,对桩板墙内侧土压力计算值和实测值进行对比分析,对反映桩板墙路基长期稳定性的土压力衰减规律进行试验研究。试验结果表明,桩板墙内侧土压力实测值与计算值存在较大差异,实测值在悬臂端中部存在拐点而非线性分布,桩身存在可优化空间。根据实测资料,桩身内侧土压力值在工后2个月内的衰减幅度最大,平均值为4. 15kPa,其后时间段的衰减幅度较小,平均值为0. 6～1. 1kPa。因此,路基填筑完成后的2个月为土压力衰减的关键期,在此期间应避免大型机械设备等重载对路基产生的影响。
Starting from the bearing characteristics of pile-slab wall roadbed of a passenger dedicated line,this paper make a comparative analysis between the calculated value and the measured value of soil pressure inside the pile-slab wall and study experimentally the law of earth pressure attenuation reflecting the long-term stability of pile-slab embankment. The test results show that,there is a big difference between measured and calculated about soil pressure on the inner side of pile-slab wall and the measured values have a nonlinear distribution in the middle of the cantilever,therefore,there is an optimization space for the pile. According to the measured data,the value of soil pressure on the inner side of pile-slab wall decreased the most within 2 months after construction,the average was 4. 15 kPa and the small range in the later period,the average was 0. 6 ～ 1. 1 kPa. As a result,the first 2 months after subgrade filling is the critical period of soil pressure attenuation,the influence of heavy load on the roadbed should be avoided.
Starting from the bearing characteristics of pile-slab wall roadbed of a passenger dedicated line,this paper make a comparative analysis between the calculated value and the measured value of soil pressure inside the pile-slab wall and study experimentally the law of earth pressure attenuation reflecting the long-term stability of pile-slab embankment. The test results show that,there is a big difference between measured and calculated about soil pressure on the inner side of pile-slab wall and the measured values have a nonlinear distribution in the middle of the cantilever,therefore,there is an optimization space for the pile. According to the measured data,the value of soil pressure on the inner side of pile-slab wall decreased the most within 2 months after construction,the average was 4. 15 kPa and the small range in the later period,the average was 0. 6 ～ 1. 1 kPa. As a result,the first 2 months after subgrade filling is the critical period of soil pressure attenuation,the influence of heavy load on the roadbed should be avoided.
引文
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[2]刘春刚. H形路堑桩板墙结构计算及支护效果分析[J].铁道建筑，2017,57(11):82-85.
[3]张万涛.高速铁路路基帮填沉降变形控制及监测技术应用探讨[J].铁道标准设计，2017,61(4):47-50.
[4]吴波.铁路路基工程建设过程中工后沉降控制措施分析[J].铁道标准设计，2008(6):27-29.
[5]李宇峰.基于现场监测的高速铁路陡坡地基桩板墙填方路基变形特性分析[D].成都:西南交通大学，2014.
[6]王瑷琳，崔俊杰，韩志霞，等.高速铁路中低压缩性土地基沉降控制有关问题研究[J].铁道标准设计，2018,62(11):10-14.
[7]黄治云，张永兴，董捷.桩板墙土拱效应及土压力传递特性试验研究[J].岩土力学，2013,34(7):1887-1892.
[8]张力.高速铁路陡坡地基路堤桩板墙受力特性监测分析[D].成都:西南交通大学，2014.
[9]程佳.桩板墙墙前倾斜坡面被动土压力计算方法研究[D].重庆:重庆交通大学，2018.
[10]吴江，张良，周成，等.高速铁路无砟轨道陡坡路基桩板墙侧向位移的影响分析[J].铁道科学与工程学报，2018,15(3):567-573.