| 非均质黏土地基中平面应变隧道最小支护压力数值模拟 |
| |
| 引用本文： | 周维祥,黄茂松,吕玺琳.非均质黏土地基中平面应变隧道最小支护压力数值模拟[J].岩土力学,2010,31(Z2):418-421. |
| |
| 作者姓名： | 周维祥 黄茂松 吕玺琳 |
| |
| 作者单位： | 1. 同济大学 岩土与地下工程教育部重点实验室，上海 200092；2. 同济大学 地下建筑与工程系，上海 200092 |
| |
| 基金项目： | 国家自然科学基金项目(No. 50908171)；国家杰出青年基金资助项目(No. 50825803)；上海市优秀学科带头人计划资助项目 (No. 09XD1403900)。 |
| |
| 摘 要： | 土体由于沉积而具有天然的非均质性,但关于非均质地基中隧道开挖面稳定性的研究却很稀少,在实际盾构隧道工程中均按均质地基对待。但这一简化并没有考虑非均质性对保持开挖面稳定所需最小支护压力的有利作用,以及对破坏模式的影响。故文中采用基于tresca准则的弹塑性有限元法来研究黏聚力随深度线性变化的纯黏土地基中平面应变隧道的开挖面稳定性,模拟了土体失稳渐进破坏的全过程。最终验证了无量纲化的有效性,得到了各种工况时保持土体稳定的最小支护压力值,并发现了黏聚力线性变化斜率对深埋隧道破坏模式的影响,可为理论分析和工程实践提供依据。
|
| 关 键 词： | 平面应变隧道 开挖面稳定 非均质 破坏模式 数值模拟 |
| 收稿时间： | 2010-07-29 |
Numerical simulation of minimal support pressure of plane strain tunnel in non-homogeneous clay |
| |
| ZHOU Wei-xiang,HUANG Mao-song,LÜ,Xi-lin.Numerical simulation of minimal support pressure of plane strain tunnel in non-homogeneous clay[J].Rock and Soil Mechanics,2010,31(Z2):418-421. |
| |
| Authors: | ZHOU Wei-xiang HUANG Mao-song LÜ Xi-lin |
| |
| Institution: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
| |
| Abstract: | soil is naturally non-homogeneous as the result of deposits, but the investigation is only a few about the face stability of tunnel which is excavated in non-homogeneous ground, so they was treated as homogeneous ground in actually geotechnical projects. the beneficial effect of non-homogeneous ground on the minimum support pressure which maintain the stability of the head face, and the impact of non-homogeneous ground on failure mode are not taken into account. So the elastoplastic finite element method based on Tresca criterion is used to study the stability of the plane strain tunnel face which is in pure clay ground with the condition that the cohesive force varies linearly along the depth. The whole progressive failure process of soil instability is simulated. Finally, the effectiveness of dimensionless is verified; the smallest support pressures in different conditions are obtained; and the effect of non-homogeneity on failure mode is found. So as to provide a deep understandings for theoretical analysis and project practices. |
| |
| Keywords: | plane strain heading face stability non-homogeneity failure mode numerical simulation |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
