沉积磷石膏的物理力学特性试验研究  

Physico-mechanical properties of deposition phosphogypsum

作　　者：米占宽[1] 饶徐生 储学群 曹培[1] 

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024 [2]云天化国际化工公司三环分公司,云南昆明650113 [3]中石化南京工程有限公司,江苏南京210098

出　　处：《岩土工程学报》2015年第3期470-478,共9页Chinese Journal of Geotechnical Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(Y312011;Y313012)

摘　　要：磷石膏是磷酸生产过程中的副产品,目前的综合利用率尚不足25%,大部分需要堆存存放。受地形限制和经济效益考虑,中国主要为湿法堆存的山谷型堆场。依托柳树箐磷石膏堆积坝,针对沉积磷石膏首先开展了密度、含水率、渗透、土水特征和颗分等物理性质试验,然后开展了三轴CU、蠕变及动三轴等力学特性试验。试验结果表明:1沉积磷石膏的干密度与埋深没有相关关系;2沉积磷石膏不具有自然分级现象,但具有明显的各向异性;3沉积磷石膏具有较高的摩擦角和抗液化能力,但其蠕变变形较大、渗透比降较小。上述工作为分析磷石膏堆积坝的坝体稳定性提供了基础,对现行磷石膏库的运行管理以及新建工程的设计具有重要的借鉴意义。Phosphogypsum(PG) is an acidic by-product produced during the production of phosphoric acid from phosphate rock. In China, only 25% of PG is recycled at present, while 75% is stored by wet storage method in valley regions due to restriction of terrain and economic consideration. Based on the Liushuqing PG stacking dam, the physical properties of deposition PG including density, moisture content, infiltration, soil water characteristics and grade are tested. The mechanical properties of triaxial CU, creep and dynamic triaxial tests are performed. The results show that:(1) The dry density and depth are not related;(2) The deposition PG does not have a natural graded phenomenon, but it has significant anisotropy;(3) The deposition PG has a high friction angle and liquefaction resistance, but its creep deformation is great and seepage gradient is small. The above work provides the basis for the stability analysis of PG stacking dam, and it has an important meaning to the operation management of the existing project and the design of new projects.

关 键 词：磷石膏 堆积坝 沉积规律 抗剪强度 蠕变 液化 

分 类 号：TQ177.375[化学工程—硅酸盐工业]