土体旋转流变仪开发与土压平衡盾构改性土体塑性流动特性实验

孟庆琳; 屈福政; 李守巨

土体旋转流变仪开发与土压平衡盾构改性土体塑性流动特性实验 English Version

1. 大连理工大学机械工程学院，辽宁大连 116024 ； 2. 大连理工大学工业装备结构分析国家重点实验室，辽宁大连 116024

基金项目: 国家重点基础研究发展计划（973）项目（2007CB714006）

详细信息

作者简介:
孟庆琳 (1981 – ) ，男，天津市人，博士研究生，主要从事盾构密封仓压力平衡问题的数值仿真研究。

中图分类号: U455
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出版历程
- 发布日期: 2011-10-14

Development of soil rotational rheometer and experiment on plastic flow characteristics of conditioned soil in earth pressure balance shield

1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China; 2. State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 为了研究土压平衡式盾构机（ EPBS ）密封仓及螺旋输送机内改性土体塑性流动特性，开发了一种土体旋转流变仪。该装置属于可变围压式控制应变型旋转流变仪，通过测量标准十字叶片在给定围压及转速条件下的旋转扭矩，获得被测介质的表观动力黏度。对某地铁施工标段的砂土进行实验测量，实验砂土均采用泡沫改性且改性配比相同，而初始含水率不同（ 5% ， 10% 和 15% ）。测量条件包含 4 个不同围压等级（ 100 ， 200 ， 300 和 400 kPa ）和 7 个不同的叶片转速（ 1/3.4 ， 1/4.1 ， 1/5 ， 1/6.4 ， 1/9 ， 1/15 和 1/30 RPM ）。实验结果表明，泡沫改性砂土的剪切应力与剪切速率之间满足 Bingham 流体模型，属于一种黏塑性非牛顿流体。其黏度系数和屈服应力均随围压的增大而增大。该装置不但可作为一种比较改性土体塑性流动特性优劣的工具，而且可以为仿真获取密封仓及螺旋输送机内压力场分布和研究密封仓压力平衡控制提供实验支撑。
- 土压平衡式盾构 /
- 改性土体 /
- 塑性流动特性 /
- 非牛顿流体
Abstract: A soil rotational rheometer is developed for investigating plastic flow characteristics of conditioned soil in the bulk chamber and the screw conveyor of earth pressure balance shield (EPBS). The device belongs to variable pressure and controlled strain rate rotational rheometer. It is capable of obtaining apparent viscosity by measuring the torsional shear applied to a standard vane with controlled pressure and strain rate. The test sands come from a section of a metro and are prepared by the same conditioning treatments under different initial moisture contents (5%, 10% and 15%). The test conditions contain four confining pressure levels (100, 200, 300 and 400 kPa) and seven vane speeds (1/3.4, 1/4.1, 1/5, 1/6.4, 1/9, 1/15 and 1/30 RPM). The results show that the relationship between shear stress and stain rate of foam conditioned sand fits the Bingham fluid model. It belongs to the visco-plastic non-Newtonian fluid. The viscosity coefficient and the yield stress increase with the increase of the confining pressure. The device is a valuable tool for comparing plastic flow characteristics of conditioned soil in EPBS and the test support for investigating distribution of pressure for simulation of soil flow in the working chamber and along the screw conveyor and developing pressure balance control in EPBS.
- earth pressure balance shield /
- conditioned soil /
- plastic flow characteristic /
- non-Newtonian fluid

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参考文献(19)

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