南京溧水爱景山锶矿掘进巷道过断层时的支护技术

Support Technology for Tunneling Crossing Fault in Aijingshan Strontium Deposit of Lishui, Nanjing

摘要: 南京溧水爱景山锶矿控矿断裂构造早期为张性断裂，晚期不同位置由张性转变为压性断裂构造。前期由于对控矿断裂构造属性变化不明，在巷道掘进过程中过断层的支护方案产生了一定的安全隐患。针对不同力学属性的断层位置，经过多次工程实践，本文提出“张性段优先固岩、压性段加强支挡、溶洞段分层支护”的过断层支护方案。经过监测对比，该方案在围岩变形量、支护稳定性、施工安全成本等方面取得了较好的效果。该技术可为类似工作面过断层提供经验借鉴。

Abstract: The ore-controlling fault of Aijingshan strontium deposit in Lishui, Nanjing is initially a tensile fault, and later changed from the tensile fault to the compressive fault at different locations. In the early stage, due to the unclear changes of the properties of the ore-controlling fault, there were certain safety hazards for Tunneling Crossing Fault. After multiple engineering practices for fault locations with varying mechanical properties, this paper proposes a fault-crossing support scheme, i.e. “prior solidification for tension zones, enhanced support for compression zones, and layered support for karst cave zones”. Through monitoring and comparison, the scheme has achieved favorable results in the surrounding rock deformation, support stability and safety costs. This technology may provide an experience and reference for similar working faces crossing faults.