Study of effects of foam concrete preset deformation layer on long-term stability of deep soft rock tunnel

CHEN Wei-zhong; TIAN Hong-ming; YANG Fu-dong; GENG Ya-mei

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Study of effects of foam concrete preset deformation layer on long-term stability of deep soft rock tunnel

更新时间：2026-06-25

- Study of effects of foam concrete preset deformation layer on long-term stability of deep soft rock tunnel
- Vol. 32, Issue 9, (2011)
- 作者机构：
  
  1. 山东大学岩土与结构工程研究中心,济南,250061
  2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： U459.2
- Online First：13 September 2011，
  
  Published：2011
- 稿件说明：
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CHEN Wei-zhong, TIAN Hong-ming, YANG Fu-dong, et al. Study of effects of foam concrete preset deformation layer on long-term stability of deep soft rock tunnel[J]. 2011, 32(9).
DOI：

CHEN Wei-zhong, TIAN Hong-ming, YANG Fu-dong, et al. Study of effects of foam concrete preset deformation layer on long-term stability of deep soft rock tunnel[J]. 2011, 32(9). DOI：

摘要

泡沫混凝土的单轴和三轴试验研究表明，泡沫混凝土具有较高压缩性和良好延性，可以作为深埋软岩隧道初期支护与二次衬砌之间预留变形层填充材料，分析了其对宜巴高速公路深埋软岩隧道长期稳定性的影响。研究表明，深埋软岩软岩隧道在二次衬砌施工之后依然会产生较大的蠕变变形，单纯依靠提高二次衬砌的厚度，并不能完全控制住围岩的蠕变变形，而且衬砌结构很容易由于变形压力过大而发生破坏。泡沫混凝土预留变形层，可以很好地吸收围岩蠕变变形，缓解二次衬砌承担的蠕变变形压力，减小衬砌的变形，改善其受力，采用厚度较小的二次衬砌即满足隧道长期运营的要求。

Abstract

Uniaxial and triaxial tests of foam concrete show that the foam concrete which has the capacity of high compressibility can be used as filling material between primary support and secondary lining in deep soft rock tunnel. And the effects of this filling material which is called preset deformations layer on long-time stability of Yi-Ba expressway is studied. The results show that the creep deformation of surrounding rock in deep tunnel still increase after the construction of secondary lining; and it is hardly to be controlled by the method of increasing the thickness of lining; besides

the secondary lining is more easily destroyed by deformation pressure. However

preset deformation layer of foam concrete is able to decrease the deformation pressure on secondary lining by absorbing the creep deformation of rock. As a result

long-term stability of deep soft rock tunnel can be guaranteed by much thinner secondary lining.

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