摘要
尾矿堆积坝体内自由水若未及时排出,浸润线高于设计,可能会造成溃坝事故。为此,本文研制了一种由加筋排水板和反滤层组成的矩形圆孔排渗加筋复合构件,并通过材料性能测试获取了其各种力学性能指标。在此基础上,以细粒尾矿为填料土,利用拉拔试验、三轴剪切试验研究排渗加筋复合构件不同压实度及垂直荷载作用下,排渗加筋复合构件与细粒尾矿的界面作用特性及其加筋作用机理性。研究结果表明:新型排渗加筋复合构件具有较好的渗透性及抗拉强度;填料压实度对界面强度参数影响较大,随着压实度的提高,界面拉拔系数与粘聚力增长较快;排渗加筋复合构件对细粒尾矿剪膨性有明显约束作用,可以同时提高土体的峰值强度和残余强度。研究成果验证了新型排渗加筋复合构件具有良好的加固效果,为细粒尾矿堆积坝设计提供借鉴意义。
If free water in the tailings storage dam body is not discharged in time,the phreatic line will be higher than the design level,which may lead to dam failure accidents.For this reason,this paper developed a rectangular seepage-drainage reinforced composite member with circular holes,composed of reinforced drainage boards and filter layers,and obtained various mechanical property indexes through material performance tests.On this basis,with fine-grained tailings as filling soil,pull-out tests and triaxial shear tests were used to study the interface interaction characteristics and reinforcement mechanism between the member and fine-grained tailings under different compaction degrees and vertical loads.The research results show that the new seepage-drainage reinforced composite member has good permeability and tensile strength;the filling compaction degree has a significant impact on the interface strength parameters—as compaction degree increases,the interface pull-out coefficient and cohesion increase rapidly;the member has an obvious restraining effect on the shear dilatancy of fine-grained tailings,and can simultaneously improve the peak strength and residual strength of the soil mass.The research results verify that the new member has a good reinforcement effect,providing a reference for the design of fine-grained tailings storage dams.
作者
徐智
Xu Zhi(Yunnan Geological Exploration Institute of China Chemical Geology and Mine Bureau,Kunming,Yunnan,650000,China)
出处
《化工矿产地质》
2025年第3期251-257,共7页
Geology of Chemical Minerals
关键词
尾矿堆积坝
排渗加筋
压实度
拉拔系数
力学性能
Tailings storage dam
Seepage-drainage reinforcement
Compaction degree
Pull-out coefficient
Mechanical properties
