有效固结应力法在水泥土搅拌桩挡土墙土压力计算中的应用

^论文编号:TM139   ^论文字数:20813,页数:59 附任务书，开题报告，文献综述，外文翻译

 摘 要: 本文首先阐述了粘性土的不排水抗剪强度特性和变化规律，对挡土墙土压力计算的有关理论进行综述，并引用前人的研究，对有效固结应力法进行了概述，提出利用有效固结应力法计算挡土墙土压力的计算方法和计算公式。然后结合具体的工程算例将有效固结应力法应用于挡土墙两侧土压力的计算中。在EXCEL表格中，对同一工程实例使用有效固结应力法、Rankine-Bell水土合算法和Rankine-Bell水土分算法分别计算挡土墙的土压力。最后，根据EXCEL表格计算得到的结果，画出三种方法计算得到挡土墙土压力受力图，包括主动土压力和被动土压力受力图，并对不同的计算结果画出直方图进行对比分析。结果表明：有效固结应力法算得的土压力值均小于其他两种方法，三种方法计算的主动土压力相差较大，特别是有效固结应力法和Rankine-Bell水土分算法算得的值，后者是前者的2倍多，而三种方法计算的被动土压力相差较小。

关键词：有效固结应力法；挡土墙；主动土压力；被动土压力；水土合算；水土分算；

Calculation

Abstract：In this paper, the undrained shear strength of cohesive soil characteristics and variation of earth pressure on retaining wall of the theory are reviewed, citing previous studies, the effective consolidation stress method are outlined, proposes to use effective consolidation stress method the calculation of earth pressure on retaining wall and formulas. Then combined with the specific engineering examples ，the effective consolidation stress method is applied to earth pressure of retaining walls on both sides of the calculation. In the EXCEL table, on the same engineering examples, using effective consolidation stress method, Rankine-Bell Combined Calculation of Water and Soil Pressure method and Rankine-Bell Separate Calculation of Water and Soil Pressure method respectively calculation of retaining of earth pressure. Finally, according to the results obtained EXCEL spreadsheet, draw three ways to calculate the earth pressure on retaining wall by the attempt, including the active earth pressure and passive earth pressure by trying to, and draw the histogram of the different results were compared. The results showed: calculated by the effective stress method of soil consolidation pressures were less than the other two methods, three methods to calculate the active earth pressure difference is higher, especially the effective consolidation stress law and the Rankine-Bell algorithm is considered as the value of the land and water points , which is 2 times more than the former, while the three methods to calculate the passive earth pressure is negligible.
Key words：effective consolidation stress theory; earth retaining wall; active earth pressure; passive earth pressure; Combined Calculation of Water and Soil Pressure; Separate Calculation of Water and Soil Pressure;
 
目  录
中文摘要 I
英文摘要 II
目录 III
1 绪论
      1.1  概述 1
      1.2  本文选题的必要性和背景 3
      1.3  本文的研究内容与拟解决的主要问题 4
 
2 粘性土的不排水抗剪强度
      2.1  引言 6
      2.2  测定土不排水强度的试验方法 7
          2.2.1  室内试验 7
          2.2.2  现场试验 8
 2.3  确定粘性土不排水强度的不同方法 8
 2. 3. 1  Bjerrum法 9
 2. 3. 2  Mesri法 10
 2. 3. 3  大应变不排水强度法（USALS法） 12
 2. 3. 4  再压缩（Recompression）或再固结（Reconsolidation）法 
  12
 2. 3. 5  SHANSEP法 13
 2. 3. 6  Recompression法与SHANSEP法的对比及适用条件 20
 
3 挡土墙土压力理论回顾和有效固结应力法
 3.1  土压力综述 22
 3.1.1  土压力的产生及计算简述 22
 3.1.2  土压力的类型 22
 3.2  土压力计算方法 23
 3.2.1  静止土压力计算公式 24
 3.2.2  主土压力计算公式 25
 3.2.3  被动土压力计算公式 28
 3.3  有效固结应力法 30
 3. 3. 1  有效固结应力法概述 30
 3. 3. 2  有效固结应力法的计算公式推导 31
 3.4  有效固结应力法计算挡土墙上土压力的方法 34
 3.4.1  主动土压力情况 34
 3.4.2  被动土压力 36
 
4 挡土墙土压力分析算例
 4.1  利用有效固结应力法分析挡土墙土压力算例 38
 4.1.1  水泥土搅拌桩的概述 38
 4.1.2  算例 38
 4.2  挡土墙土压力计算公式 39
 4.2.1  有效固结应力法计算挡土墙土压力的公式 39
 4.2.2   Rankine-Bell公式（水土合算）计算挡土墙土压力的公式 39
 4.2.3   Rankine-Bell公式（水土分算）计算挡土墙土压力的公式 39
 4.3   计算结果 40
 4.3.1  EXCEL计算表格 40
 4.3.2  土压力受力图 43
 4.3.3  计算结果分析 46
 
5 结论
 5.1  本文结论 48
致谢 49
参考文献 50

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