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1.河海大学岩土力学与堤坝工程教育部重点试验室,江苏 南京 210024
2.江阴市城乡规划设计院有限公司, 江苏 江阴 214400
3.江阴市市政建设工程有限公司,江苏 江阴 214411
Received:25 August 2024,
Revised:2024-11-02,
Published:28 April 2025
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王欣正,孔纲强,陈永辉等.静压压实工艺对工程渣土固化土强度影响的试验研究[J].防灾减灾工程学报,2025,45(02):375-383.
WANG Xinzheng,KONG Gangqiang,CHEN Yonghui,et al.Experimental Study on Effect of Static Compaction Technology on Strength of Stabilized Engineering Residual Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(02):375-383.
王欣正,孔纲强,陈永辉等.静压压实工艺对工程渣土固化土强度影响的试验研究[J].防灾减灾工程学报,2025,45(02):375-383. DOI: 10.13409/j.cnki.jdpme.20240825001.
WANG Xinzheng,KONG Gangqiang,CHEN Yonghui,et al.Experimental Study on Effect of Static Compaction Technology on Strength of Stabilized Engineering Residual Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(02):375-383. DOI: 10.13409/j.cnki.jdpme.20240825001.
工程渣土和工业固废资源化利用,是解决无废城市建设的重要举措之一;以改性硅藻土、磷石膏和电石渣为环保低碳固废基固化剂,对苏州市基坑开挖工程渣土进行固化资源化试验;以改性硅藻土∶电石渣∶磷石膏=0.39∶0.23∶0.38的配比为固化剂(掺量8%),探讨压实工艺中初始含水率和压实压力等因素对固化土压实度和无侧限抗压强度的影响规律,以压实压力与压实时间作为控制压实度进一步影响强度的变量,细化压实工艺对固化土强度提升的最优参数。研究结果表明,试验条件下,当工程渣土初始含水率为液限,其最佳压实工艺参数压实压力约为0.92 MPa、压实时间约为20 min,固化土28 d强度可达2.39 MPa;当初始含水率<20%时,固化剂在土颗粒间水化不充足,提高压实压力促进固化剂在土颗粒间反应,对强度提升影响相对较大;当初始含水率超过液限时,土颗粒与固化剂间形成了水膜,隔离了接触,影响了胶结能力导致强度降低。
The resource utilization of engineering residual soil and industrial solid waste is one of the key measures for advancing the development of "zero-waste cities". Using modified diatomite
phosphogypsum
and carbide slag as eco-friendly and low-carbon solid waste-based stabilizers
stabilization and resource utilization tests were conducted on excavated residual soil from Suzhou foundation pit projects. With a stabilizer mix ratio of modified diatomite:carbide slag∶phosphogypsum=0.39∶0.23∶0.38 (8% dosage)
the effects of initial moisture content and compaction pressure on the compaction degree and unconfined compressive strength (UCS) of stabilized soil were investigated. Taking compaction pressure and duration as variables controlling compaction degree and subsequent strength
the optimal parameters of compaction technology for strength enhancement were refined. The results showed that under test conditions in this study
when the initial moisture content reached the liquid limit
the optimal compaction parameters were 0.92 MPa for 20 minutes
achieving 2.39 MPa UCS on day 28. When the initial moisture content fell below 20%
the hydration of the stabilizers among soil particles was insufficient. Increasing the compaction pressure significantly promoted the reaction of stabilizers among soil particles
resulting in a relatively significant influence on strength enhancement. When the initial water content exceeded the liquid limit
a water film was formed between soil particles and the stabilizers that isolated their contact
reducing cementation capacity and strength.
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