Based on many experiments,the optimal ingredient-ratio range of the fillbody of high-water material solidifying tailings along the downward drift ,the strength required by th loading layer of fillbody, the filling technology which was used and the result of filling test are discussed according to the concrete conditions of Jiaojia gold mine, and the recommendations for the test are made.
Basic criteria for judging the fully loading layer, transitional layer and non loading layer are respectively proposed in accordance with structure of roof as well as the mining and technical conditions.
The independence and intercommunion scarcity between bearer layer and service layer make it hard to guarantee the QoS for NGN service, especially for the traditional real time communication service, which prevent the large-scale application of NGN.
In mobile next generation network(NGN), MSC will split up into 2 physical components--mobile softswitch (i.e. call server) and media gateway. It is one of the main advantages to separate the controll layer from the bearer layer in NGN which is different from legacy 2G.
It is noted that, since NGN will further evolve towards the IP Multimedia Subsystem (IMS) based networks and network bearing layer technologies will transit from IPv4 to IPv6, China Unicom will actively probe into the IMS-based NGN architecture and networking modes, and make great efforts on the trial application and promotion of IPv6, especially on the development and publicity of mobile IPv6 services.
Operators should pay attention to the interconnection and interworking issue that is related to the service layer, encapsulation layer, data processing layer, SDH bearing layer, SDH line side equipment of a communication system.
The relation between thickness of loaded layer and cost of backfill is that the cost of backfill increase approximately by 3.5% and 7% and the production capability increase approximately by 15% and 20%,respectively,when the drift width increases to 5.5 m and 6.0 m.
It should be introduced into the IP transport layer of Next Generation Network(NGN), not only because it can support for traffic engineering and layer 2 Virtual Private Network(VPN), as ATM does, protoction switching as SDH does, but also layer 3 VPN, which is a totally new service.