| 郑晓慧.岩溶区桩基力学特性分析及桩型优化设计研究[J].地质与勘探,2018,54(4):824-832 |
| 岩溶区桩基力学特性分析及桩型优化设计研究 |
| Study on mechanical properties of pile foundation and optimum design of pile types in karst areas |
| 投稿时间：2018-03-20 修订日期：2018-05-21 |
| DOI：10.12134/j.dzykt.2018.04.016 |
| 中文关键词: 公铁两用桥梁 桩型优化 理论分析 岩溶桩基 岩溶率 侧摩阻 勘探深度 桩长 |
| 英文关键词: Railway dual-purpose bridge, pile optimization, theoretical analysis, karst pile foundation, karst rate statistics, side friction, depth of exploration, pile length |
| 基金项目: |
|
| 摘要点击次数: 1606 |
| 全文下载次数: 998 |
| 中文摘要: |
| 设计人员在岩溶区进行市政、铁路等重荷载建筑作业时，往往采用桩基础以满足上部结构对地基土的承载力需求。桩基设计亦按照岩溶区桩基技术规范，在完整基岩满足限值的前提下，验算基础承载力并选定基础设计参数，进而指导施工。分析我国各地区岩溶勘探现状，基岩裂隙的不均匀性造成岩溶发育的不规律性，导致基岩岩溶分布与埋深无特定关系。故按照既有经验，机械执行设计规范，以完整基岩作为桩长控制的唯一因素，不可避免的造成经济浪费。通过采用土工布等限定成桩边界，建立桩基受力模型，得出岩溶段桩体可提供的最大摩阻力，并将其作为桩体力学平衡组成因素。最终通过岩溶率统计，估算潜在摩阻力值，从而在满足承载力需求的情况下，调整设计桩长及勘探深度，进而制定特定地区设计原则，优化成桩工艺、节约工程造价。 |
| 英文摘要: |
| Pile foundation has commonly been used by designers during daily work in the karst areas to meet the bearing capacity of foundation soils in municipal and railway construction. The design should be in accordance with technical code for pile foundation in karst areas. Under the premise that the complete bedrock meets the limit value, the foundation bearing capacity can be checked and the foundation design parameters can be selected. Finally, the upper design can be to used to guide the construction. With the analysis of China 's current situation on geology investigation in karst areas , we find that the heterogeneity of bedrock fissures caused the irregularity of karst development, resulting in that there has no specific relationship between bedrock karst distribution and burial depth. So, if designers implement the design code mechanically just according to their existing experiences, and seeing complete bedrock as the only control factor of pile length, such a behavior will cause economic waste inevitably. This study suggests to establish the force model of piles by using materials as geotextile to limit the pile’s making boundary. Through this model, we can infer the maximum friction provided by karst section of the pile and take it as the constituent factor of pile mechanics balance. Finally, we can estimate the potential friction values through karst rate statistics, adjust the pile’s length design and exploration depth. And then we can develop the specific design principles, optimize the pile technology and lower the project cost. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
