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陈俊林1 ,  谢金宏2 ,  杨尚川2

( 1 .  四川公路桥梁建设集团有限公司公路三分公司 ， 四川 成都 610200 ; 

2.  西南交通大学 交通隧道教育部重点实验室 ， 四川 成都610031)

摘   要 ：粉煤灰土层是隧道开挖中少见的一种软弱地层，在开挖之前需要向地层加入水泥进行处理。选取 四川宜宾盐坪坝隧道粉煤灰地层土作为基层材料，采用三轴试验研究不同水泥掺比、不同围压及养护龄期下粉煤灰水泥土的应力－应变曲线特性、变形规律以及破坏模式。结果表明：随着水泥掺比以及龄期的提升，粉煤灰水泥土在同一围压下的应变软化愈发显著，脆性增强且破坏后强度下降更迅速；在水泥掺比相同的情况下，随着围压的增加，粉煤灰水泥土试件破坏时对应的应变、峰值强度以及残余强度增幅显著；割线模量E50均随水泥掺比、围压及养护龄期增加而增加。研究结果可为类似工程的水泥土旋喷桩或注浆方案设计提供参考。

关键词：水泥土 ；粉煤灰 ；三轴试验 ；变形

中图分类号：TU443     

文献标志码：A     

文章编号：1005- 8249  (2024)  03- 0001- 06

DOI：10. 19860/j.cnki.issn1005 - 8249.2024.03 .001

 

CHEN Junlin1,  XIE Jinhong2,  YANG Shangchuan2

1.Sichuan Road & Bridge Co. ，Ltd. ，Highway Three Branch , Chengdu 610200 , China;

2.Key Laboratory of Transportation Tunnel Engineering , Ministry of Education , Southwest Jiaotong University , Chengdu 610031 , China

Abstract : The Yanpingba Tunnel ′sfly ash stratum soil was selected as the base material for this study. The stress - strain properties , deformation behavior , and failure modes of fly ash cement soil were investigated using unconsolidated and undrained triaxial tests with varying cement mixing ratios , confining pressures , and curing ages. The results indicate that with an increase in cement mixing ratio and curing age , the strain softening of fly ash cement soil specimens under the same confining pressure becomes more pronounced , while the brittleness increases and strength decreases rapidly after failure. The confining pressure has a significant impact on the strain , peak strength , and residual strength of the fly ash cement soil specimen at failure , with an increase in confining pressure leading to a corresponding increase in these values. The secant modulus E50 was found to increase with increasing cement mixing ratio , confining pressure , and curing age. The results presented in this paper provide valuable insights for the design of cement - soil rotary jetting piles in engineering applications.

Keywords : cement soil; fly ash; triaxial compression test; deformation

 

*基金项目： 国家自然科学基金  (52278371 ) 。

作者简介： 陈俊林  (1996—) ,  男 ，本科 ，助理工程师 ，研究方向：岩土与地下工程。 

通信作者：杨尚川  (1987—) ,  男 ，博士 ，副教授 ，研究方向：岩土与地下工程。

收稿日期：2023- 05- 25