黄金科学技术 ›› 2020, Vol. 28 ›› Issue (4): 541-549.doi: 10.11872/j.issn.1005-2518.2020.04.145
Zheng JIAN1(),Guoyan ZHAO1(
),Xi WANG2,Ju MA1,Quri XIAO1
摘要:
由于土压力盒材料与砂土在物理力学性质上的差异,在刚性加载砂标试验中土压力盒受力面易出现拱效应、应力重分布和应力分散等问题,导致刚性加载在很多砂标试验中的适用性较差。针对上述问题,基于缩小加载面积和介质空间的思路设计出新型的砂标试验方法——应力集中砂标法。采用刚性加载试验法和应力集中砂标试验法对3种不同规格的土压力盒进行室内标定试验,将2种试验法获得的标定结果与厂家气标结果进行对比。结果表明:新型试验方法获得的标定曲线离散率均较低,标定结果满足室内试验的精度要求,具备现场应用价值;刚性加载试验标定结果相较气标值偏小,而应力集中砂标法的标定结果相较气标值偏大,表明在质地松软、颗粒孔隙率较大的砂标试验环境中,应力集中砂标法具有更强的适用性。
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