| 软土盾构隧道开挖面支护压力极限上限解 |
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| 引用本文： | 吕玺琳,王浩然.软土盾构隧道开挖面支护压力极限上限解[J].土木与环境工程学报,2011,33(2):65-69. |
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| 作者姓名： | 吕玺琳 王浩然 |
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| 作者单位： | 同济大学,岩土及地下工程教育部重点实验室,上海 200092;同济大学,地下建筑与工程系,上海 200092 |
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| 基金项目： | 国家自然科学基金青年科学基金，上海市晨光计划，同济大学青年优秀人才培养行动计划 |
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| 摘 要： | 考虑到天然软黏土非均质性和各向异性特点,采用极限分析上限法在不排水条件下对盾构隧道开挖面稳定进行了研究,推导了极限支护压力的计算公式。土体非均质性和各向异性对极限支护压力的影响有相互放大作用,在当土体非均质性和各向异性较强时,极限支护压力与隧道埋深的关系存在一个极大值。分析结果表明,在分析软土盾构隧道开挖面稳定性时,土体的非均质性和各向异性影响较大,不能忽略。
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| 关 键 词： | 非均质 各向异性 软土 盾构隧道 支护压力 上限解 |
| 收稿时间： | 2010/7/24 0:00:00 |
Upper Bound Solution of the Limit Support Pressure during Shield Tunneling in Soft Clay |
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| Lü Xi-lin,WANG Hao-ran.Upper Bound Solution of the Limit Support Pressure during Shield Tunneling in Soft Clay[J].Journal of Civil and Environmental Engineering,2011,33(2):65-69. |
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| Authors: | Lü Xi-lin WANG Hao-ran |
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| Affiliation: | a,b(a.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,b.Department of Geotechnical Engineering,Tongji University,Shanghai 200092,P.R.China) |
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| Abstract: | Considering the nonhomogeneity and anisotropy of the undrained shear strength of soft clay,the face stability of shield tunnel was studied by upper-bound limit analysis,and the formula for calculating the limit support pressure was obtained.The influences of nonhomogeneity and anisotropy on the limit support pressure amplify with each other.The relationship between limit support pressure and tunnel depth also depends on the nonhomogeneity and anisotropy;the limit support pressure reaches maximum value at a certain tunnel depth when nonhomogeneity and anisotropy are strong enough.These results show the nonhomogeneity and anisotropy of clays cannot be neglected when analyzing the stability of tunnel face. |
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| Keywords: | nonhomogeneity anisotropy soft clay shield tunnel support pressure upper-bound solution |
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