Analysis on the damage zone of overlying strata and safety layer distance on the upward mining above the longwall goaf

Based on the safety distance from the oilfield facilities to the nearby structures and facilities specified in the national and industrial standards, the relevant technical requirements are proposed and SAFETI software is applied to quantitatively evaluate the safety influence on the oilfield production facilities, the safety distance from the productio.

Based on the analysis of the safety distance of traffic flow on expressway,the conception and calculation method about basic safety distance were proposed,which can ensure the safety of traffic flow.

According to the relationship between gas pipeline and cantilever pipes,the calculation model of safety distance that gas pipeline horizontally passes through foundation ditch of cantilever piles is established.

The treatments of key technical problem for Beilun hill multi-purpose terminal,Ningbo Port were introduced and the safe spacing between the new dyke and the built trestle of the cement quay and the selection of pile type under the complex geological stratum were also introduced.

Through learning and analyzing the related national and local laws, the safe distance can be gotten which between the base station and the airport, highways, railways, high-speed railway, river.

Based on Nagel-Schreckenberg model(NS for short),it includes effective gap and brake light,moreover a novel concept about the variable security gap is introduced.