然而，当围岩开挖后若能及时进行有效的支护，提高破碎岩体的整体性，改善力

However, when the surrounding rock if timely and effective support to improve the integrity of broken rock, to improve the mechanical properties, together with the supporting structure carrying structure, so that the mechanism will change, and transformed into benign cycle path, conducive to the stability of surrounding rock. Thereby the key stability, improve PD1 exploration adit fault crushed zone rock in two ways: First, the control of ground water overflow, and to maintain the surrounding rock mass in a closed state, to avoid wet and dry cycles, means may be "grouting layer shotcrete technology + "for closure; secondly, to adjust the supporting structure and supporting parameters optimized appropriately increase the support resistance, thereby increasing the level of stress confining pressure to suppress excessive deformation of the rock mass.

However, when the surrounding rock excavation can be carried out in time for effective support, improve the integrity of the broken rock body, improve the mechanical characteristics, and carry the structure together with the support structure, which will change the mechanism of action, and convert into a benign cycle path, is conducive to the stability of the surrounding rock. Thus, to improve the stability of PD1 exploration flat-cut fault broken band surrounding rock is key in two aspects: First, control groundwater overflow, and keep the surrounding rock body in a closed state, try to avoid wet and dry circulation, can be blocked by the help of "pulptechnology and concrete spray layer"; In turn, the pressure stress level is raised to suppress the excessive deformation of the surrounding rock body.

However, if the surrounding rock can be excavated in time to carry out effective support, improve the integrity of broken rock mass, improve mechanical properties, and support structure to bear the structure together, this will change the mechanism of action, and turn into a benign cycle path, which is conducive to the stability of surrounding rock. Therefore, the key to improve the stability of surrounding rock in PD1 exploration adit fault fractured zone lies in two aspects: first, to control the overflow of groundwater and keep the surrounding rock mass in a closed state, to avoid the wet-dry cycle as far as possible, and to block it by means of "grouting technology + concrete spraying layer"; second, to adjust the support structure and optimize the support parameters, to properly increase the support resistance, and then to increase the confining pressure stress. Horizontal restraint of excessive deformation of surrounding rock mass.<br>