饱和粉土路基的变形特性研究
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摘要
随着我国高速公路的快速发展,粉土成为常见的路基土,粉土路基的沉降预测也逐渐被工程界所关注。由于粉土具有压实困难、强度低、易冲刷等特点,需要对其沉降过程进行详细的研究。因此本文利用有限差分软件,选取合理的本构模型及方法,深入探讨饱和粉土路基的沉降变形特性及竖向附加应力分布,总结饱和粉土路基沉降变形的发展规律,对高速公路的建设具有重要的工程实际意义。
本文紧密结合饱和粉土的各种力学特性,模拟交通荷载作用下,针对不同工况的饱和粉土路基的变形,并对模拟结果进行详细的对比分析,主要研究内容如下:
1.收集大量文献资料,主要包括有关饱和粉土变形机理和交通荷载对路基沉降影响方面的文章,为论文的写作提供必要的理论依据和参考价值;
2.将交通荷载按不同的情况进行模拟,分析并验证数值模拟方法在路基沉降研究中的适用性,并对不同工况下的结果进行对比分析;
3.在路基沉降变形方面,将静态模拟法与动力分析法进行详细的对比分析,找出这两种方法的优劣性,为饱和粉土路基的沉降预测提供一定的指导。
取得的主要研究成果如下:
1.将交通荷载简化成等效静荷载,从静荷载方面模拟饱和粉土路基的沉降变形,与路基规范推荐的理论方法的结果进行对比分析,验证这种方法的简便性、准确性和直观性;
2.模拟饱和粉土路基在简化静荷载的作用下,路基的应力状态,从土质条件、路堤高度、地下水位、轴载条件等方面对路基的应力和沉降进行对比分析,总结出路基的应力和沉降变化趋势;
3.将交通荷载简化成三角波形荷载,从简谐振动方面,研究动荷载瞬时作用下饱和粉土路基土体中的应力状态,以及循环荷载作用下土体的变形状况;
4.在简化静荷载作用下,只能反映出由静荷载引起的弹塑性沉降。在简谐动荷载作用下,可以反映出由循环动荷载作用引起的往返变形和累积残余变形;
With the rapid development of Chinese highway, silty sand becomes a common roadbed and the settlement, forecasting of silty subgrade has aroused wide concerns in engineering gradually. Because the saturated silty soil has characteristics of high compression, bulky water content and low strength, more detailed research is required in the settlement process. Therefore, the settlement characteristic and vertical distribution of additional stress of saturated silty soil are discussed with finite difference software. Tendency law of the settlement deformation in saturated silty soil is acquired, all of these have practical significance in the construction of the expressway.
This paper combines various of Mechanical properties of saturated silty soil, the simulation with deformation of saturated silty soil subgrade in different conditions under vehicle load is performed, detailed comparative analysis to simulation results has been done. Main research contents are as follows:
1. Collect large amount of literature, mainly including the articles about the deformation mechanism of saturated silty soil and traffic load on the affection of the settlement on embankment , which provides the necessary theoretical basis and reference value for writing the paper ;
2. Simulate the traffic load in different conditions, analyze and verify the applicability of the numerical simulation method in the study of subgrade settlement, then make a comparative analysis under the results of different conditions ;
3. In terms of the deformation of subgrade settlement, make a comparative analysis in details of static simulation method and dynamic analysis to identify the pros and cons between these two, and some guideline for settlement forecast of saturated silty sand subgrade have been brought forward.
The main research results are as follows:
1. The traffic load can simplify to equivalent static load, simulate the settlement deformation of saturated silty soil under the static load, and make a comparative analysis between theoretical methods recommended by the specifications for design of highway subgrades, verify the simplicity、the accuracy、the visuality of this method .
2. Stress status of the saturated silt roadbed in simplified static load is simulated; comparison and analysis between stress and settlement of the roadbed are performed in aspects such as soil condition, embankment height, underground water level and axial load. Developing tendency of stress and settlement of the roadbed has been concluded.
3. Simplify the traffic load into the triangular wave load. From the simple harmonic motion, study the stress state of saturated silty soil subgrade by instantaneous action and soil deformation condition under cyclic dynamic load.
4. Static calculation only response with elastic-plastic settlement under simplified static load. Simple harmonic dynamic computation can reflect deformation along with long cycle load and accumulated residual deformation under cyclic dynamic load.
本文紧密结合饱和粉土的各种力学特性,模拟交通荷载作用下,针对不同工况的饱和粉土路基的变形,并对模拟结果进行详细的对比分析,主要研究内容如下:
1.收集大量文献资料,主要包括有关饱和粉土变形机理和交通荷载对路基沉降影响方面的文章,为论文的写作提供必要的理论依据和参考价值;
2.将交通荷载按不同的情况进行模拟,分析并验证数值模拟方法在路基沉降研究中的适用性,并对不同工况下的结果进行对比分析;
3.在路基沉降变形方面,将静态模拟法与动力分析法进行详细的对比分析,找出这两种方法的优劣性,为饱和粉土路基的沉降预测提供一定的指导。
取得的主要研究成果如下:
1.将交通荷载简化成等效静荷载,从静荷载方面模拟饱和粉土路基的沉降变形,与路基规范推荐的理论方法的结果进行对比分析,验证这种方法的简便性、准确性和直观性;
2.模拟饱和粉土路基在简化静荷载的作用下,路基的应力状态,从土质条件、路堤高度、地下水位、轴载条件等方面对路基的应力和沉降进行对比分析,总结出路基的应力和沉降变化趋势;
3.将交通荷载简化成三角波形荷载,从简谐振动方面,研究动荷载瞬时作用下饱和粉土路基土体中的应力状态,以及循环荷载作用下土体的变形状况;
4.在简化静荷载作用下,只能反映出由静荷载引起的弹塑性沉降。在简谐动荷载作用下,可以反映出由循环动荷载作用引起的往返变形和累积残余变形;
With the rapid development of Chinese highway, silty sand becomes a common roadbed and the settlement, forecasting of silty subgrade has aroused wide concerns in engineering gradually. Because the saturated silty soil has characteristics of high compression, bulky water content and low strength, more detailed research is required in the settlement process. Therefore, the settlement characteristic and vertical distribution of additional stress of saturated silty soil are discussed with finite difference software. Tendency law of the settlement deformation in saturated silty soil is acquired, all of these have practical significance in the construction of the expressway.
This paper combines various of Mechanical properties of saturated silty soil, the simulation with deformation of saturated silty soil subgrade in different conditions under vehicle load is performed, detailed comparative analysis to simulation results has been done. Main research contents are as follows:
1. Collect large amount of literature, mainly including the articles about the deformation mechanism of saturated silty soil and traffic load on the affection of the settlement on embankment , which provides the necessary theoretical basis and reference value for writing the paper ;
2. Simulate the traffic load in different conditions, analyze and verify the applicability of the numerical simulation method in the study of subgrade settlement, then make a comparative analysis under the results of different conditions ;
3. In terms of the deformation of subgrade settlement, make a comparative analysis in details of static simulation method and dynamic analysis to identify the pros and cons between these two, and some guideline for settlement forecast of saturated silty sand subgrade have been brought forward.
The main research results are as follows:
1. The traffic load can simplify to equivalent static load, simulate the settlement deformation of saturated silty soil under the static load, and make a comparative analysis between theoretical methods recommended by the specifications for design of highway subgrades, verify the simplicity、the accuracy、the visuality of this method .
2. Stress status of the saturated silt roadbed in simplified static load is simulated; comparison and analysis between stress and settlement of the roadbed are performed in aspects such as soil condition, embankment height, underground water level and axial load. Developing tendency of stress and settlement of the roadbed has been concluded.
3. Simplify the traffic load into the triangular wave load. From the simple harmonic motion, study the stress state of saturated silty soil subgrade by instantaneous action and soil deformation condition under cyclic dynamic load.
4. Static calculation only response with elastic-plastic settlement under simplified static load. Simple harmonic dynamic computation can reflect deformation along with long cycle load and accumulated residual deformation under cyclic dynamic load.
引文
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[2]河南高速公路通车总里程达到4860公里全国第一[N/OL].郑州日报, [2010-01-16]. http://www.dahe.cn/xwzx/sz/t20100116_1732067.htm.
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[3]刘福臣.对粉土定名的商榷[J].岩土工程技术, 1999, (1): 58-60.
[4] Kaare H, Rune D, Sandbakken G. Strength of undisturbed versus reconstituted silt and silty sand specimens.Journal of Geotechnical and Geoenvironmental Enginee-ring, 2000, July: 606-617.
[5] Salgado R, Bandini P, Karim A.Shear strength and stiffness of silty sand.Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(5): 451-462.
[6]潘振华.粉砂土路基工程特性及其整治[J].铁道标准设计, 2002, (7): 51-53.
[7]曹右生.粉土承载力评价探讨[J].勘察科学技术, 1995, (2): 20-25.
[8]孟毅.潍坊市区低塑性粉土标贯击数与承载力标准值回归关系[J].西部探矿工程, 1997.5, (5): 33.
[9]杨鸿钧.用孔隙比修正评价粉土的容许承载力和密实度.港工技术, 2003, (3): 53-55.
[10]曹婧.浅谈高速公路粉质土路基填筑施工质量控制[J].内蒙古科技与经济, 2004, (3): 49-50.
[11]申爱琴,郑南翔,苏毅,等.含砂低液限粉土填筑路基压实机理及施工技术研究[J].中国公路学报, 2000, 13(4): 12-15.
[12]王维桥,商庆森,王川,等.黄河冲积粉砂土的可塑性与压实控制标准分析[J].山东大学学报(工学版), 2003, 33(5): 589-592.
[13]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社, 1999.
[14]周鲁平,杜广印,赵俊明.高速公路沉降预测方法及应用[J].公路工程与运输, 2005(8), 112.
[15]卫涛.交通荷载作用下粉土路基沉降特性研究[硕士学位论文].郑州:河南工业大学, 2009.
[16]李保德,谢伟平,李荣.交通荷载所引起的地基振动的研究[J].武汉理工大学学报, 2001, 23(3): 77-79.
[17]凌建明,王伟,邬洪波.行车荷载作用下湿软路基残余变形的研究[J].同济大学学报, 2002, 30(11): 1315-1320.
[18]李进军,黄茂松,王育德.交通荷载作用下软土地基累计塑性变形分析[J].中国公路学报, 2006, 19(1): 1-5.
[19]蒋华忠,李国维,余湘娟,等.交通荷载作用下低路堤软基的室内试验研究和沉降计算[J].公路, 2006, 10: 59-62.
[20]耿大新,钟才根,郑明新.交通荷载作用下软土路基残余变形的研究[J].华东交通大学学报, 2007, 24(4): 46-50.
[21]查文华,洪宝宁,徐毅.交通荷载下低路堤高速公路路面路基振动测试与分析[J].公路工程, 2007, 32(4): 113-117.
[22]栾茂田,何杨,许成顺,等.黄河三角洲粉土循环剪切特性的试验研究[J].岩土力学, 2008, 29(12): 3211-3216.
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