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| Research on the Measurement Metliod of CP-I Inside Long Tunnel in High - speed Railway |
| FU Heng – you |
| (China Railway Design Corporation，Tianjin 300142，China) |
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Abstract Abstract ： Research purposes ： The main purpose of tiunnel control survey is to reduce the transverse breakthrough eror and to make sure the breakthrough of the tunnel. The transverse breakthrough error from GPS network outside the tunnel has been reduced sharply. The method and precision of control survey inside the tunnel has been of extreme importance for the breakthrough of the tunnel. Traversing has been usually used for CP-I horizontal control survey inside the long tunnel，which has many problems such as less observation，low graphic strength，lateral swing，high cost and low efficiency. A method of CP-I measurement and its data processing based on side - angle resection at freely - occupied stations has been presented in this paper. The design and research of the control network，the measurement method，the precision control and the adjustment have been made in this paper. Research conclusions:( 1) The precision and efficiency of control survey have been improved by the CP-I measurement metliod inside the super long tunnel of high - speed railway， which has been described in this paper. The forced centering markers，which can be permanently retained，had been used for the monuments of control points to eliminate the centering error. (2 ) The experiment has been carried out in a high - speed railway project. The measurement results of the method of CP-I measurement have verified the feasible of the technical design and research and can meet the tunnel 2nd order requirements of tHe specification. (3) It is proved that this method can be applied to the control survey of construction in high - speed railway super long tunnel， which is of great reference value to the modification，supplement and improvement of tlie existing specification.
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Received: 02 May 2017
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2017, Vol. 34 
