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魏衍杰¹   ,  魏    平²

( 1 .  巨野縣水務事業(yè)發(fā)展中心 ， 山東 巨野 274900; 2. 水發(fā)規(guī)劃設計有限公司 ， 山東 濟南 250100)

摘   要 ：分散性土廣泛分布于我國東北 、西北地區(qū)，其具有抗水蝕能力弱 、抗剪強度低 、抗?jié)B性能差等特點 。為了解決分散性土工程性能差的問題，本次研究提出采用木質素磺酸鈣改良分散性土并測定其物理力學性質，探究了不同木鈣摻量以及養(yǎng)護齡期下改性土力學性能變化 。主要結論如下： ( 1) 隨著木鈣摻入量的增加， 土體的液限 、塑限以及最優(yōu)含水率均出現(xiàn)下降，土樣的破壞模式逐漸過渡至塑性破壞 ；土體抗壓強度先增大后減小 ，壓縮系數(shù)先減小后增大 。 (2)  隨著土樣養(yǎng)護齡期的延長，改性土的無側限抗壓強度也逐漸增大，壓縮系  數(shù)不斷減小 。 (3)  隨著木鈣摻量的增加，土樣顆粒表面膠結物質逐漸增多，改性土顆粒鑲嵌接觸，接觸面積逐漸增大，同時膠結物包裹顆粒形成大的團聚體，土體結構穩(wěn)定性較好。

關鍵詞 ：分散性土 ；木質素磺酸鈣 ；物理力學性質 ；養(yǎng)護齡期 ；塑性破壞

中圖分類號 ：TU41           

文獻標志碼 ：A            

文章編號 ：1005- 8249  (2023)   06- 0048- 07

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 06. 008

WEI Yanjie ,  WEI Ping

( 1 . Water Development  Center of Juye ,  Juye 274900 ,   China;   2. Shuifa Planning & Design Co. ，Ltd. ，Jinan 250100 ,  China)

Abstract : Dispersive soil is widely distributed in the northeast and northwest regions of China. It has the characteristics of weak water erosion resistance, low shear strength and poor impermeability. In order to solve the problem of poor engineering performance of dispersive soil, this study proposes to use calcium lignosulfonate to improve dispersive soil and determine its physical and mechanical properties, and explores the changes of mechanical properties of modified soil under different calcium lignosulfonate content and curing age. The main conclusions are as follows : ( 1 ) With the increase of the content of wood calcium, the liquid limit, plastic limit and optimal water content of the soil decreased, and the failure mode of the soil sample gradually transitioned to plastic failure. The compressive strength of the soil increases first and then decreases, and the compression coefficient decreases first and then increases. ( 2 ) With the extension of the curing age of the soil sample, the unconfined compressive strength of the modified soil also increases gradually, and the compression coefficient decreases continuously. ( 3 ) With the increase of the content of wood calcium, the cementing material on the surface of the soil sample particles gradually increases, the modified soil particles are inlaid and contacted, and the contact area gradually increases. At the same time, the cement encapsulates the particles to form large aggregates, and the soil structure is stable.

Keywords : dispersive soil ; calcium lignosulfonate ; physical and mechanical properties ; curing age ; plastic failure

作者簡介 ：魏衍杰  (1969—) ,  男 ，高級工程師 ，主要從事水利工程規(guī)劃設計及建設管理。

通信作者 ：魏平  (1987—) ,  男 ，高級工程師 ，主要從事水利工程規(guī)劃設計工作。

收稿日期 ：2023- 08-23