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陳俊林1 ,  謝金宏2 ,  楊尚川2

( 1 .  四川公路橋梁建設集團有限公司公路三分公司 ， 四川 成都 610200 ; 

2.  西南交通大學 交通隧道教育部重點實驗室 ， 四川 成都610031)

摘   要 ：粉煤灰土層是隧道開挖中少見的一種軟弱地層，在開挖之前需要向地層加入水泥進行處理。選取 四川宜賓鹽坪壩隧道粉煤灰地層土作為基層材料，采用三軸試驗研究不同水泥摻比、不同圍壓及養護齡期下粉煤灰水泥土的應力－應變曲線特性、變形規律以及破壞模式。結果表明：隨著水泥摻比以及齡期的提升，粉煤灰水泥土在同一圍壓下的應變軟化愈發顯著，脆性增強且破壞后強度下降更迅速；在水泥摻比相同的情況下，隨著圍壓的增加，粉煤灰水泥土試件破壞時對應的應變、峰值強度以及殘余強度增幅顯著；割線模量E50均隨水泥摻比、圍壓及養護齡期增加而增加。研究結果可為類似工程的水泥土旋噴樁或注漿方案設計提供參考。

關鍵詞：水泥土 ；粉煤灰 ；三軸試驗 ；變形

中圖分類號：TU443     

文獻標志碼：A     

文章編號：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

 

*基金項目： 國家自然科學基金  (52278371 ) 。

作者簡介： 陳俊林  (1996—) ,  男 ，本科 ，助理工程師 ，研究方向：巖土與地下工程。 

通信作者：楊尚川  (1987—) ,  男 ，博士 ，副教授 ，研究方向：巖土與地下工程。

收稿日期：2023- 05- 25