高速公路梁桥加宽桩基础沉降差异控制技术研究
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摘要
新、旧桥桩基础的差异沉降控制是高速公路拓宽改造工程中的关键技术问题之一，但国内外对加宽桥梁新、旧桩基础差异沉降控制研究较少，我国相关的桥梁设计与施工技术规范目前正在酝酿中，其中关于地基基础部分涉及很少，且主要沿用岩土工程的理论和方法。本文结合郑漯高速公路加宽工程，通过理论分析、数值模拟、现场试验及其理论预测等方法，对加宽梁桥新、旧桩基础的受力与变形机理开展研究，在此基础上，提出了梁桥加宽新、旧桥桩基础沉降差设计控制技术。主要成果体现在：
1．基于数值模拟分析结果，提出了梁桥加宽后新、旧基础间的沉降差控制指标为5mm；指出新桥桩基础成孔过程对旧桥桩基础的受力和变形有一定影响，并给出了工程建议。
2．通过现场试验，研究了加宽梁桥桩基础在施工荷载和结构自重作用下随时间变化的沉降变形规律，实际桩基础沉降变形约3mm，验证了沉降差控制标准的工程适用性。
3．采用灰色系统预测了梁桥桩基础的沉降变化趋势，并和实测成果进行了对比分析，较好的吻合结果为相关加宽梁桥桩基础沉降变形控制提供科学依据。
4．结合梁桥加宽的工程特点，采用弹性理论方法，研究了新、旧梁桥桩基础相互作用下应力特性和沉降变形的规律，提出了新、旧梁桥桩基础沉降差的理论计算公式。
5．提出了基于沉降差控制的梁桥加宽工程设计技术，填补了现行梁桥桩基础设计技术在加宽工程中存在的不足。
论文的研究成果解决了高速公路梁桥加宽工程桩基础沉降控制技术中的难点问题，针对性和适用性强，具有重要的理论和工程应用价值，推广前景广阔。
The technology to control the differential settlement between the new and old pile foundation is oneof the key technical problems in expressway widening and reconstruct engineering. However, whether inthe domestic or foreign, there has less research about the control technology. The design and constructiontechnology specification about bridge widening is brewing in China, which rarely involved in thefoundation part and mainly follows the theories and methods of geotechnical engineering. Combined withZheng Luo expressway widening engineering, based on theoretical analysis, numerical simulation, field testand theoretical prediction, the stress and deformation mechanism of the new and old pile foundation wereresearched and the technology to control the differential settlement was put forward. The main results wereshown as followings:
1. Based on numerical simulation, the control standard of the differential settlement between the newand old pile foundation should be5mm was put forward, and the pore-forming process of new pilefoundation had a certain impact on the stress and deformation of old pile foundation was pointed out, thecorresponding engineering recommendations were put forward.
2. According to the field test, the settlement deformation law changed with time of the new pile underconstruction load and structural weight was researched. And the differential settlement was about3mm,which verified the applicability of the differential settlement control standard.
3. Used gray system theory to predict the settlement variable tendency of the pile foundation, andwhen compared with the measured results, the predictions were in good agreement with the measuredresults, which provided a scientific basis for the settlement control of similar widening bridge pilefoundation.
4. Combined with the engineering characteristics and used elasticity theory, the stress characteristicsand the law of settlement under the interaction of the new and old pile foundation were researched, and atheoretical calculation formula to calculate differential settlement of pile foundation was put forward.
5. The quite perfect design technology to control the widening pile foundation settlement was putforward, which filled the shortcomings of the existing beam bridge design technology specification inwidening engineering.The research results with strong pertinence and applicability solved the technical difficulties in control thedifferential settlement of pile foundation was used in widened beam bridge, which have an important theoryand project practical value and have broad application prospect.
1．基于数值模拟分析结果，提出了梁桥加宽后新、旧基础间的沉降差控制指标为5mm；指出新桥桩基础成孔过程对旧桥桩基础的受力和变形有一定影响，并给出了工程建议。
2．通过现场试验，研究了加宽梁桥桩基础在施工荷载和结构自重作用下随时间变化的沉降变形规律，实际桩基础沉降变形约3mm，验证了沉降差控制标准的工程适用性。
3．采用灰色系统预测了梁桥桩基础的沉降变化趋势，并和实测成果进行了对比分析，较好的吻合结果为相关加宽梁桥桩基础沉降变形控制提供科学依据。
4．结合梁桥加宽的工程特点，采用弹性理论方法，研究了新、旧梁桥桩基础相互作用下应力特性和沉降变形的规律，提出了新、旧梁桥桩基础沉降差的理论计算公式。
5．提出了基于沉降差控制的梁桥加宽工程设计技术，填补了现行梁桥桩基础设计技术在加宽工程中存在的不足。
论文的研究成果解决了高速公路梁桥加宽工程桩基础沉降控制技术中的难点问题，针对性和适用性强，具有重要的理论和工程应用价值，推广前景广阔。
The technology to control the differential settlement between the new and old pile foundation is oneof the key technical problems in expressway widening and reconstruct engineering. However, whether inthe domestic or foreign, there has less research about the control technology. The design and constructiontechnology specification about bridge widening is brewing in China, which rarely involved in thefoundation part and mainly follows the theories and methods of geotechnical engineering. Combined withZheng Luo expressway widening engineering, based on theoretical analysis, numerical simulation, field testand theoretical prediction, the stress and deformation mechanism of the new and old pile foundation wereresearched and the technology to control the differential settlement was put forward. The main results wereshown as followings:
1. Based on numerical simulation, the control standard of the differential settlement between the newand old pile foundation should be5mm was put forward, and the pore-forming process of new pilefoundation had a certain impact on the stress and deformation of old pile foundation was pointed out, thecorresponding engineering recommendations were put forward.
2. According to the field test, the settlement deformation law changed with time of the new pile underconstruction load and structural weight was researched. And the differential settlement was about3mm,which verified the applicability of the differential settlement control standard.
3. Used gray system theory to predict the settlement variable tendency of the pile foundation, andwhen compared with the measured results, the predictions were in good agreement with the measuredresults, which provided a scientific basis for the settlement control of similar widening bridge pilefoundation.
4. Combined with the engineering characteristics and used elasticity theory, the stress characteristicsand the law of settlement under the interaction of the new and old pile foundation were researched, and atheoretical calculation formula to calculate differential settlement of pile foundation was put forward.
5. The quite perfect design technology to control the widening pile foundation settlement was putforward, which filled the shortcomings of the existing beam bridge design technology specification inwidening engineering.The research results with strong pertinence and applicability solved the technical difficulties in control thedifferential settlement of pile foundation was used in widened beam bridge, which have an important theoryand project practical value and have broad application prospect.
引文
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