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胡    璇

（ 陜西鐵路工程職業技術學院 ，陜西 渭南 714000)

摘   要： 城市地下工程施工中，富水基坑邊坡粉細砂地層穩定性較差，易出現涌水、涌砂等地質災害。為研究富水基坑邊坡粉細砂地層加固防滲技術，室內利用聚氨酯( PU) 和粉煤灰材料制備了新型 PU/粉煤灰注漿材料，并對新型注漿材料注漿加固的粉細砂結石體展開了力學試驗和細觀特征觀察。試驗結果表明：( 1) 養護齡期越長，結石體的抗壓強度則越大。當粉煤灰摻量為 10%、養護齡期為12 h 時，結石體的抗壓強度最大，達 到 6. 89 MPa; (2) 浸水后注漿結石體的抗壓強度明顯變低，試件的抗壓強度與浸水時間之間成負指數關系。當浸水時間為 9 d 時，粉煤灰摻量為 10%的注漿結石體抗壓強度最大，此時其抗壓強度為 3. 55 MPa; ( 3) 含水率越高，則注漿結石體的內部結構越松散； 而當水解時間達到9 d 后，注漿結石體內部產生了大量的裂隙，結石體內部結構破壞嚴重，因此結石體的力學性質變差。

關鍵詞： 基坑工程； 富水； 粉細砂地層； 注漿加固； 力學試驗； 細觀特征

中圖分類號： TU45      

文獻標志碼： A      

文章編號： 1005-8249 (2023) 03-0013-05

DOI : 10. 19860/j.cnki.issn1005-8249.2023.03.013

HU Xuan

( Shaanxi Railway Institute , Weinan 714000 , China)

Abstract: In the construction of urban underground engineering, the stability of silty fine sand stratum on the slope of water rich foundation pit is poor, and geological disasters such as water gushing and sand gushing are easy to occur. In order to study the anti-seepage technology of silty fine sand stratum of water rich foundation pit slope, a new PU/ fly ash grouting material was prepared by using polyurethane (PU) and fly ash materials indoors, and the mechanical tests and meso characteristics of the silty fine sand stone body reinforced by the new grouting material were carried out. The results show that: (1) the longer the curing age, the stronger the bearing capacity of the stone body. When the content of fly ash is 10% with the curing age at 12 h, the compression strength of the stone body reaches the maximum, reaching 6.89 MPa; (2) The compression strength of the grouted stone becomes lower obviously after immersion, and there is a negative exponential relationship between the compression strength and immersion time. When the soaking time is 9 d, the bearing capacity of grouting stone body with 10% fly ash is the best, and its compression strength is 3.55 MPa; (3) the higher the water content is, the looser the internal structure of the grouting stone body is; When the hydrolysis time reaches 9D, a large number of cracks are produced in the interior of the grouting stone, and the internal structure of the stone is seriously damaged, so the mechanical properties of the stone become worse.

Keywords :  foundation  pit  engineering;  rich  water;  silty  fine  sand  stratum;  grouting  reinforcement;  mechanical  test;

mesoscopic features

?基金項目： 陜西鐵路工程職業技術學院科研項目 ，富水基坑邊坡粉細砂地層注漿防滲加固技術研究  ( KY2022-47) 

作者簡介： 胡璇  (1993—) , 女，碩士。主要研究方向：隧道與邊坡。

收稿日期： 2022-06-10