FEATURES OF ANCHORING FORCE LOSS IN PRE-STRESSED ANCHOR CABLE UNDER DIFFERENT LITHOLOGIES

There are many factors affecting anchoring effects of pre-stressed anchor cable. These factors are complicate and interactive. The anchoring force loss has a deep relation with properties of rock and soil. With theoretical analysis, experimental study and numerical simulation, this paper examines the influence mechanism of rock and soil creep formation and compression formation on anchoring force loss and anchoring force loss laws of pre-stressed anchor cable caused by solid rock, weak rock, broken rock and soil. The results show that the properties of rock and soil mass cause the difference of anchoring force loss rate. In addition, there is less loss rate if rock and soil mass is in good quality on the condition of the same initial anchoring force. This research result can be used to guide the design, construction and management of anchoring projects and improve economic and social benefits of the whole practice.