有限土体土压力和边坡安全系数分析

介玉新

doi:10.16511/j.cnki.qhdxxb.2019.22.018

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清华大学学报（自然科学版） ›› 2019, Vol. 59 ›› Issue (8) : 619-627. DOI: 10.16511/j.cnki.qhdxxb.2019.22.018

水利水电工程

有限土体土压力和边坡安全系数分析

介玉新

作者信息 +

Analyses on finite earth pressure and slope safety factors

JIE Yuxin

Author information +

文章历史 +

摘要

结合岩土工程近年来的发展，该文针对有限土体土压力、边坡安全系数及临界滑动面的计算方法中存在的问题进行分析探讨，发现现有的计算有限土体土压力的方法存在缺陷，由此计算的土压力会随着土体宽度的减小而趋近于0，违背土力学常识。有限土体土压力应当采用Rankine土压力理论进行计算。采用基于强度储备定义的安全系数，可以无须区分“抗滑力”和“滑动力”。对于给定滑动面，取滑动面上土体的抗剪强度来计算安全系数是由抗剪强度的定义本身所决定的，但土体并不一定能够调整到“最大抗滑能力”。最小安全系数对应的临界滑动面不一定是最先发生滑动的破坏面。该研究对理解相关概念、提高岩土力学的认知水平具有一定意义。

Abstract

This paper analyzes recent geotechnical engineering studies such as the finite earth pressures, slope safety factors and critical slip surfaces. However, current methods for calculating the finite earth pressure are not appropriate since they predict that the earth pressure decreases to zero as the soil mass width decreases, which violates the soil mechanics laws. The Rankine earth pressure theory can still be used to calculate the finite earth pressure. The slope safety factor is defined according to the strength reserve with no need to distinguish between the "anti-sliding force" and the "sliding force". The shear strength definition shows that the soil shear strength should be used to calculate the safety factor for a given soil slope slip surface. However, a slope cannot necessarily be adjusted to develop its "maximum anti-sliding ability". Furthermore, the critical slip surface corresponding to the minimum safety factor may not be the first surface to slide. Thus, this investigation helps discriminate the key concepts for understanding geotechnical mechanics.

导出引用

介玉新. 有限土体土压力和边坡安全系数分析[J]. 清华大学学报（自然科学版）. 2019, 59(8): 619-627 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.018

JIE Yuxin. Analyses on finite earth pressure and slope safety factors[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(8): 619-627 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.018

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基金

国家“十三五”重点研发计划（2017YFC0404803）；国家自然科学基金项目（41790434）

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收稿日期	出版日期
2018-12-06	2019-08-15
发布日期
2019-08-05

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