离子型稀土矿矿体旁压试验研究
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摘要
为了保证离子型重稀土矿矿山的稳定性,在江西某稀土矿矿体中开展旁压试验,获取真实有效的矿体力学指标。试验得到了该稀土矿矿体随深度变化的初始压力P0、临塑压力Pf、极限压力Pl、旁压模量Em、变形模量E0、压缩模量Es和承载力特征值等力学参数。试验结果表明:不同深度的旁压试验曲线都经过了初始、似弹性和塑性3个不同的变形阶段,且随着试验点深度的增加,曲线整体沿着横坐标右移;无论是压力值、模量值还是承载力特征值,该试验矿体的数据都随着深度有明显的增大趋势,且在粉土和微风化岩的分界处发生突变;利用旁压试验初步确定了该矿山的地基承载力参考值,与平板载荷试验的参考值非常接近,该结论为稀土矿临界注液强度的计算提供了有效的矿体力学参数。
In order to ensure the stability of ionic rare earth ore,pressuremeter tests were carried out in a rare earth mine in Jiangxi to obtain the true and effective mechanical index of ore body.The mechanical parameters such as initial pressure P0,imminent plastic pressure Pf,limit pressure Pl,pressuremeter modulus Em,deformation modulus E0,compressive modulus Esand bearing capacity characteristic value of the ore body varying with depth were obtained in the tests.The results show that the curves of pressuremeter test at different depths have three different deformation stages:initial stage,quasi-elastic stage and plasticity stage,and with the increase of test point depth,the whole curve moves to the right along the abscissa;the data of the pressure value,modulus value and bearing capacity characteristic value of the test orebody have an increasing trend with the depth;the reference value of foundation bearing capacity of the ore body is preliminarily determined by pressuremeter test,which is very close to the reference value of plate load test.The results provide real and effective mechanical parameters for calculating the critical injection strength of rare earth ore.
In order to ensure the stability of ionic rare earth ore,pressuremeter tests were carried out in a rare earth mine in Jiangxi to obtain the true and effective mechanical index of ore body.The mechanical parameters such as initial pressure P0,imminent plastic pressure Pf,limit pressure Pl,pressuremeter modulus Em,deformation modulus E0,compressive modulus Esand bearing capacity characteristic value of the ore body varying with depth were obtained in the tests.The results show that the curves of pressuremeter test at different depths have three different deformation stages:initial stage,quasi-elastic stage and plasticity stage,and with the increase of test point depth,the whole curve moves to the right along the abscissa;the data of the pressure value,modulus value and bearing capacity characteristic value of the test orebody have an increasing trend with the depth;the reference value of foundation bearing capacity of the ore body is preliminarily determined by pressuremeter test,which is very close to the reference value of plate load test.The results provide real and effective mechanical parameters for calculating the critical injection strength of rare earth ore.
引文
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[2]丁文,张杰,邓秋凤,等.四川某地硫磷铝锶矿有用元素赋存状态和综合利用探讨[J].化工矿物与加工,2017,46(2):14-18.
[3]李帅,武文芳,潘东,等.原生磷矿及其风化矿中微量和稀土元素特征分析[J].化工矿物与加工,2018,47(7):15-18.
[4]陈健,吴楠.世界稀土资源现状分析与我国稀土资源可持续发展对策[J].农业现代化研究,2012,33(1):74-77.
[5]佚名.俄罗斯开发出从磷石膏中提取稀土技术[J].化工矿物与加工,2016,45(8):16.
[6]吴林,张杰.磷矿酸解过程硫酸钙结晶及磷石膏中稀土浸出研究[J].化工矿物与加工,2016,45(3):8-10.
[7]何婷,张覃,左宇军,等.静载荷下含稀土磷矿石颗粒的破裂过程数值模拟[J].化工矿物与加工,2011,40(2):16-20.
[8]王洪丁,王观石,邱高磊,等.离子型稀土矿体强度特性试验研究[J].中国矿业,2016,25(9):136-140.
[9]艾光华,周源,王勇.江西稀土资源的开发利用现状与产业发展对策[J].稀土,2011,32(5):97-101.
[10]杜俊,侯克鹏,杨帆,等.都龙锡矿排土场松散岩土体原位直剪试验研究[J].现代矿业,2009,25(10):58-60.
[11]汪稔,胡建华.旁压试验在苏通大桥地质勘察工程中的应用[J].岩土力学,2003(6):887-891.
[12]胡建华,汪稔,周平,等.旁压仪在地基工程原位测试中的应用及其成果分析[J].岩土力学,2003(S2):418-422.