2025年5月7日 星期三
岩石力学与工程学报  2025, Vol. 44 Issue (1): 197-208    DOI: 10.3724/1000-6915.jrme.2024.0305
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淤泥固化土破碎重塑后的强度变形特性试验研究
王柳江1,臧耀辉1,江后根1,崔红斌2,赵  旸3
(1. 河海大学 水利水电学院,江苏 南京  210098;2. 上海速宜环境科技有限公司,上海  200051;3. 南京交通工程有限公司,江苏 南京  210019)
Experimental study on the strength and deformation characteristics of sludge solidified soil after crushing and remodeling
WANG Liujiang1,ZANG Yaohui1,JIANG Hougen1,CUI Hongbin2,ZHAO Yang3
(1. College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;
2. Shanghai Soil Environmental Technical Inc.,Shanghai 200051,China;3. Nanjing Communication Engineering Co.,Ltd.,Nanjing,Jiangsu 210019,China)
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摘要 为明确淤泥固化土破碎重塑后的强度损失及后期强度恢复特性,通过开展无侧限抗压强度试验,研究固化剂掺量、淤泥初始含水率、前养护龄期、二次固化方式、破碎程度以及后养护龄期对重塑土强度变形特性的影响,并与常规固化土进行对比分析。结果表明:当固化土的强度大于600 kPa,初期重塑土的强度趋于稳定;缩短前养护龄期、增加固化剂掺量均有利于重塑土后期强度的恢复,重塑土的最终强度可恢复到固化土强度的40%~70%;固化剂总掺量相同时,二次固化重塑土的强度总体上小于一次固化重塑土,且第1次的掺量越高,强度降低越明显;高强破碎后的二次固化重塑土初期强度小于正常破碎二次固化重塑土,但后期强度随第2次固化剂掺量的增加而增长,且有可能大于正常破碎二次固化重塑土;重塑土的抗压强度小于200 kPa时,破坏应变随着强度的增大而减小,当强度大于200 kPa,破坏应变与固化土接近,在1%~2%范围;重塑土和固化土变形模量与抗压强度之间的关系基本呈相同的线性关系,即E50 = 73.8qu。
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王柳江1
臧耀辉1
江后根1
崔红斌2
赵 旸3
关键词 土力学淤泥固化土破碎重塑土强度损失强度恢复    
Abstract:In order to investigate the strength loss and strength recovery characteristics of the sludge solidified soil after crushing and remodeling,a series of unconfined compressive strength(UCS) tests were conducted. The effects of curing agent content,initial water content of sludge,pre-curing age,two-stage solidification method,crushing degree and post-curing age on the strength and deformation characteristics of the remodeled solidified soil(RSS) were studied. In addition,the comparative analysis was carried out with that of solidified soil. The results show that the strength of the initial RSS tends to be stable as the strength of the solidified soil is greater than 600 kPa. Shortening the pre-curing age and increasing the amount of curing agent are conducive to the recovery of the strength of the RSS in the later stage,and the final strength of the RSS can be restored to 40%–70% of the strength of the solidified soil. For the two-stage solidified RSS,the strength is generally smaller than that of one-stage solidified RSS when the total amount of curing agent kept the same,and the higher the agent content used in the first stage solidification,the more obvious the strength decrease. For the influence of crushing degree,the initial strength of the two-stage solidified RSS after strong crushing is less than that of the normal crushing,but the later strength increases with the increase of the agent content used in the second stage solidification,and even be greater than that of the later strength after normal crushing. For the relationship between UCS and failure strain of the RSS,the failure strain decreases with the increase of strength as the UCS of the RSS is less than 200 kPa. As the UCS of the RSS is greater than 200 kPa,the failure strain is close to that of the solidified soil between 1%–2%. Finally,the relationship between the deformation modulus and the compressive strength of RSS and solidified soil is basically the same,which agrees linear relationship of E50 = 73.8qu.
Key wordssoil mechanics    sludge solidified soil    crushing    remodeled solidified soil    strength loss    strength recovery
    
引用本文:   
王柳江1,臧耀辉1,江后根1,崔红斌2,赵 旸3. 淤泥固化土破碎重塑后的强度变形特性试验研究[J]. 岩石力学与工程学报, 2025, 44(1): 197-208.
WANG Liujiang1,ZANG Yaohui1,JIANG Hougen1,CUI Hongbin2,ZHAO Yang3. Experimental study on the strength and deformation characteristics of sludge solidified soil after crushing and remodeling. , 2025, 44(1): 197-208.
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