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以江西城门山铜矿排土场二期扩建工程为研究对象,建立数值分析模型,通过等效塑性应变场和位移场演化规律,揭示了湖区排土场失稳破坏的特征;根据应力场分布特征,揭示了软弱基底诱发湖区排土场失稳的机理。结果表明:1)湖区排土场滑动路径可以划分为3个区域——推移式潜在滑动区、滑动过渡区和牵引式潜在滑动区;2)软弱基底材料刚度和刚度较小,引导推移式潜在滑动区沿着基底层向临空面发展,导致牵引式潜在滑动区率先在基底处产生且向背离临空面的方向发展;3)湖区排土场的稳定性,与软弱基底的黏聚力、内摩擦角、弹性模量、湖底地层倾角正相关,与软弱基底厚度负相关。综合上述分析结果,提出了分别针对推移式潜在滑动区和牵引式潜在滑动区的湖区排土场失稳防治措施。
Taking the second phase expansion project of Jiangxi Chengmenshan copper mine dump as the research object, a numerical analysis model is established and the characteristics of instability damage of the dump site are revealed through the equivalent plastic strain field and displacement field evolution law. According to the stress field Distribution characteristics, revealing the mechanism of the weak substrate induced lake area dumping instability. The results show that: (1) The slip paths of the dumps in the lake area can be divided into three areas - sliding potential sliding zone, sliding transition zone and towing potential sliding zone; 2) the weak base material has small stiffness and stiffness, The sliding zone develops along the basement layer to the provisional surface, which leads to the traction-type potential slip zone being firstly generated at the basement and moving away from the confined space. 3) The stability of the dumping area and the cohesion with the weak basement , Internal friction angle, elastic modulus, dip of the lake bottom are negatively correlated with the thickness of weak basement. Based on the above analysis results, the control measures for the instability in the lake area are proposed respectively for the potential sliding zone and the potential sliding zone.