振动下沉桩施工对受损桥梁影响范围计算

冯忠居; 乌延玲; 成超; 吴明远

doi:10.19818/j.cnki.1671-1637.2010.04.005

振动下沉桩施工对受损桥梁影响范围计算

doi: 10.19818/j.cnki.1671-1637.2010.04.005

冯忠居^1,,
乌延玲^{1, 2},
成超³,
吴明远⁴

1.
长安大学公路学院, 陕西西安 710064
2.
赤峰市公路管理处, 内蒙古赤峰 024000
3.
中交第一公路勘察设计研究院有限公司, 陕西西安 710075
4.
中交公路规划设计院有限公司, 北京 100088

基金项目:

国家西部交通建设科技项目 200931800003

广东省交通科技项目 2007-10

详细信息

作者简介:
冯忠居(1965-), 男, 山西万荣人, 长安大学教授, 工学博士, 从事岩土工程研究

中图分类号: U443.15
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- 被引次数: 0
出版历程
- 收稿日期: 2010-02-10
- 刊出日期: 2010-08-25

Influence range calculation of damaged bridge during vibropile construction

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Chifeng Highway Department, Chifeng 024000, Inner Mongolia, China
3.
CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China
4.
CCCC Highway Consultants Co., Ltd., Beijing 100088, China

More Information

Author Bio:
FENG Zhong-ju(1965-), male, professor, PhD, +86-29-82334881, ysf@gl.chd.edu.cn

摘要

摘要: 应用计算机仿真分析法、振动理论求解法与小孔扩张理论, 结合九江大桥事故现场情况, 研究了振动桩施工对周围地基土的影响范围。采用计算机仿真分析法, 模拟振动荷载作用下地基土的横向位移, 根据位移的递减规律得出其影响范围为20 m; 根据振动理论, 考虑振动波在地基土中的衰减因素, 得出其影响范围为15 m; 利用小孔扩张理论, 研究了孔径与地基土弹塑性区范围的关系, 得出其弹性区边界, 即影响范围为23 m。3种计算方法所得安全距离范围在15~23 m, 实际施工中须综合考虑打桩速率、打桩顺序及打桩工艺等因素, 综合考虑理论计算结果、工程现场实际情况和已有的实测结果, 工程处理安全范围选用18 m。事故处理平台振动下沉桩基础施工中的振动波没有引起周边环境的进一步坍塌, 因此, 安全距离范围合理。
- 基础工程 /
- 受损桥梁 /
- 振动下沉桩 /
- 理论计算 /
- 仿真分析
Abstract: The influence range of damaged bridge during vibropile construction on surrounding soil was studied in the actual accident scene of Jiujiang Bridge by using vibration theory, cavity expansion theory and simulation analysis.The lateral displacement of foundation soil under vibration load was simulated, and the influence range was 20 m according to the diminish law of displacement.According to vibration theory, the attenuation of vibration wave in foundation soil was considered, and the influence range was 15 m.Using cavity expansion theory, the relationship between the aperture and the plastic zone for the soil was analyzed, and the influence range was 23 m.The influence ranges were between 15 m and 23 m.The factors such as piling rate, piling order and piling process were considered under the construction, according to the theoretical computation results, the processing scheme of actual project and measure result, the intended safe distance is 18 m.Applied result shows that the vibration wave caused by the construction of accident treatment platform's vibropile foundation, does not cause further collapse in surrounding environment, so the influence range of theoretical analysis is scientific and reasonable.
- foundation engineering /
- damaged bridge /
- vibropile /
- theoretical calculation /
- simulation analysis

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图 1 小孔扩张应力影响区

Figure 1. Impact zone of hole expansion stress

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图 2 坍塌现场

Figure 2. Collapse locate

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图 3 计算模型

Figure 3. Simulation model

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图 4 加载路径

Figure 4. Loading path

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图 5 位移分布规律

Figure 5. Distribution rules of displacements

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图 6 最大径向位移分布规律

Figure 6. Distribution rules of largest horizontal displacements

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图 7 半径与刚度比关系

Figure 7. Relationship between radius and ratio of rigidity

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表 1 地基土能量吸收系数

Table 1. Energy absorption factor of foundation soil

土质情况	α/m^-1
松软饱和粉细砂、亚粘土、轻亚粘土	0.01~0.03
很湿的亚粘土、粘土	0.04~0.06
稍湿和干的轻亚粘土、亚粘土	0.07~0.10

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表 2 淤泥的物理力学性质

Table 2. Physical and mechanics properties of sullage

特征值	基本物理性指标			液塑限指标				直剪试验结果		固结试验结果		渗透系数K_v/(cm·s^-1)
特征值	含水率ω/%	湿密度ρ/(g·cm^-3)	孔隙比e	液限ω_L/%	塑限ω_P/%	塑性指数I_P	液性指数I_L	粘聚力c/kPa	内摩擦角φ/(°)	压缩系数a_v/MPa^-1	压缩模量E_s/MPa	渗透系数K_v/(cm·s^-1)
最大值	55.3	1.75	1.59	40.8	28.0	13.7	3.02	7.0	9.3	1.10	2.84	6.0×10^-8
最小值	47.4	1.58	1.29	33.4	21.3	10.1	1.75	1.0	1.8	0.78	1.97	3.0×10^-8
平均值	51.0	1.68	1.42	37.4	25.3	12.1	2.18	3.3	5.0	0.94	2.35	4.5×10^-8

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表 3 模型主要参数

Table 3. Main parameters of model

名称	弹性模量E/MPa	泊松比μ	粘聚力c/kPa	内摩擦角φ/(°)
振动桩桩头	36 500.00	0.167
地基土	2.84	0.350	9.0	14.8

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表 4 塑性区范围

Table 4. Plastic zone

桩径/m	E/C_u
桩径/m	60	100	150	380
0.8	3.58	4.62	5.66	9.00
1.0	4.47	5.77	7.07	11.25
1.2	5.37	6.93	8.49	13.51
1.5	6.71	8.66	10.61	16.88
1.8	8.05	10.39	12.73	20.26
2.0	8.94	11.55	14.14	22.51

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表 5 计算结果对比

Table 5. Comparison of calculating results

理论方法	目的	结果/m
有限元仿真	建立仿真模型, 分析地基土的影响范围	20
振动理论	分析弹性波在地基土中的衰减	15
小孔扩张理论	考虑不同桩基和不同地基土的塑性区范围	23

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