长江科学院院报 ›› 2023, Vol. 40 ›› Issue (3): 93-97.DOI: 10.11988/ckyyb.20211184

• 岩土工程 • 上一篇    下一篇

安哥拉红砂湿陷性影响因素试验研究

乔建伟1,2,3, 夏玉云1,3, 刘争宏1,3,4, 王冉1,3, 唐立军1   

  1. 1.机械工业勘察设计研究院有限公司,西安 710043;
    2.自然资源部陕西西安地裂缝与地面沉降野外科学观测研究站,西安 710054;
    3.陕西省特殊岩土性质与处理重点实验室,西安 710043;
    4.长安大学 地测学院,西安 710064
  • 收稿日期:2021-11-08 修回日期:2022-01-17 出版日期:2023-03-01 发布日期:2023-03-28
  • 通讯作者: 夏玉云(1968-),男,陕西定边人,正高级工程师,长期从事特殊岩土工程性质与处理技术的研究工作。E-mail:xiayy@jk.com.cn
  • 作者简介:乔建伟(1990-),男,安徽砀山人,高级工程师,博士,主要从事工程地质和特殊岩土工程方面的研究工作。E-mail:15029207728@163.com
  • 基金资助:
    陕西省创新能力支撑计划项目(2022KJXX-05,2023-CX-TD-34,2023-CX-PT-46);中国机械工业集团青年基金项目(2022-PY-01,2022-ZD-01);西安市英才计划青年项目(2022XAYC-03);中国机械设备进工程股份有限公司科技孵化项目(CMEC-KJFH-2018-02)

Experimental Study on Influencing Factors of Collapsibility of Angola Red Sand

QIAO Jian-wei1,2,3, XIA Yu-yun1,3, LIU Zheng-hong1,3,4, WANG Ran1,3, TANG Li-jun1   

  1. 1. China JK Institute of Engineering and Design, Xi'an 710043, China;
    2. Observation and Research Station ofGround Fissure and Land Subsidence, Ministry of Natural Resources, Xi'an 710054, China;
    3. Shaanxi KeyLaboratory for the Property and Treatment of Special Soil and Rock, Xi'an 710043, China;
    4. Department ofGeological Engineering, Chang'an University, Xi'an 710064, China
  • Received:2021-11-08 Revised:2022-01-17 Online:2023-03-01 Published:2023-03-28

摘要: 湿陷性是安哥拉红砂的典型工程特性,研究其影响因素对红砂地区岩土工程勘察评价具有重要意义。基于安哥拉红砂原状土与重塑土的室内压缩试验,探讨了压力、含水率、结构性、干密度和细粒土含量对红砂湿陷性的影响规律。试验结果表明:试验压力>100 kPa时,红砂重塑样湿陷系数约是原状土的2.0倍;红砂湿陷系数与试验压力和细粒土含量呈正相关关系,随压力和细粒土含量增加而增加但存在峰值压力和峰值细粒土含量,峰值压力为300 kPa,峰值细粒土含量为60%~80%;红砂湿陷系数与干密度和含水率整体上呈反比关系,原状红砂湿陷性消除和完全丧失的界限含水率分别为9%和13%;重塑土湿陷性消除和完全丧失的界限含水率分别为11%和13%,界限干密度分别为1.80 g/cm3和1.90 g/cm3,对应的压实系数分别为0.92和0.97。湿陷性红砂地区工程建设可通过提高干密度消除其湿陷性。

关键词: 红砂, 湿陷性, 影响因素, 物理指标, 安哥拉

Abstract: Collapsibility is a typical engineering characteristic of Angola red sand. It is of great significance to study its influencing factors for geotechnical investigation and evaluation in red sand area. Based on laboratory compression tests of undisturbed and remolded Angola red sand specimens, the effects of structure, pressure, moisture content, dry density and fine-grained soil content on the collapsibility of Angola red sand were examined. Test results show that when the pressure is larger than 100 kPa, the collapsibility of remolded red sand is 2.0 times that of the undisturbed red sand. The collapsibility coefficient of red sand has a positive correlation, i.e. to increase with increasing test pressure and fine-grained soil content, with peaking pressure and fine-grained soil content reaching 300 kPa and 60%-80%, respectively. Contrarily, the collapsibility coefficient of red sand is, in general, negatively correlated with dry density and water content. The critical moisture content for eliminating and completely losing the collapsibility of undisturbed red sand is 9% and 13%, respectively, and those of remolded soil 11% and 13% respectively. The critical dry density of remolded soil is 1.80 g/cm3 and 1.90 g/cm3 respectively, and the corresponding compaction coefficient is 0.92 and 0.97 respectively. For engineering construction, the collapsibility of red sand can be eliminated by increasing dry density.

Key words: red sand, collapsibility, influencing factors, physical indexes, Angola

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