| 砂性土中顶管开挖面最小支护压力的计算 |
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| 引用本文： | 魏纲,贺峰.砂性土中顶管开挖面最小支护压力的计算[J].地下空间与工程学报,2007,3(5):903-908. |
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| 作者姓名： | 魏纲 贺峰 |
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| 作者单位： | 1. 浙江大学城市学院,工程学院土木工程系,杭州,310015
2. 浙江省省直机关后勤房地产开发有限公司,杭州,310012 |
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| 摘 要： | 由于圆形顶管掘进机的长高比为1,开挖面破坏时会形成卸荷拱,滑动块是一个形状复杂的截柱体,并非楔形体模型假定的三角形楔体.假定开挖面失稳时滑动块的形状为一个梯形楔体,滑动块上部为一梯形棱柱.采用太沙基松动土压力理论,根据滑动块的整体受力平衡,推导出砂性土中考虑成层土的开挖面最小支护压力计算公式.算例分析表明,该方法的计算结果要小于楔形体模型的计算结果,更接近离心模型试验结果.
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| 关 键 词： | 顶管 砂性土 开挖面 支护压力 |
| 文章编号： | 1673-0836（2007）05-0903-06 |
| 收稿时间： | 2007-03-08 |
| 修稿时间： | 2007年3月8日 |
Calculation of Minimal Support Pressure Acting on Shield Face during Pipe Jacking in Sandy Soil |
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| WEI Gang,HE Feng.Calculation of Minimal Support Pressure Acting on Shield Face during Pipe Jacking in Sandy Soil[J].Chinese Journal of Underground Space and Engineering,2007,3(5):903-908. |
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| Authors: | WEI Gang HE Feng |
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| Abstract: | The length-height ratio of circular shield is equal to 1,and thus the uploading arch will be formed when the face is destroyed.The sliding block is a truncated prism with complicated shape but not a triangular wedge as assumed by wedge stability model.The shape of sliding block and upside of sliding block are presumed as a trapezoid wedge and a trapezoid prism respectively.Using the theory of Terzaghi's relation soil pressure,the limited support pressure formula with tunnel face in stratified sandy soil is obtained based on the principle of sliding block entire force balance.It is shown in analytical calculation that,the calculation result by the method mentioned above is smaller when compared with that by wedge model,and also more closer to the results of centrifugal-model test. |
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| Keywords: | pipe jacking sandy soil tunnel face support pressure |
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