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Wu, C.; Wen, G.; Wu, X.; Han, L.; Xu, J.; Wang, W.; Xie, H., and Li, R., 2015. Calculation method of the pull-back force for cable laying of the trenchless completed power pipeline.Typically, trenchless drilling rig is used in cable laying in power system. Then through the windlass; the cable is pulled into the pipeline. Although the size of the pull-back force is very important to calculate the pull-back force in cable laying, the existing calculation equation for pull-back force is targeted at pull-back force in pipeline laying. This article analyzes the frequently-used calculation equations and its service condition in pipeline laying. And a pull-back force test instrument in cable laying is designed, by which a large number of pull-back force of cable laying in practical engineering project is collected. Through the comparison of the measured values and calculation values by the equation for pull-back force, it is founded that the equation for pull-back force in pipeline laying is suitable for the calculation of pull-back force in cable laying in case that it multiplied by a certain coefficient. ADDITIONAL INDEX WORDS:HDD, pull-back force in pipeline laying, pull-back force in cable laying, test instrument for pull-back force.

Abstract-China has complex terrain where landslide happens very frequently, thus leading to serious damages sometimes. So in China much attention is paid to the monitoring of landslide. There are various methods in landslide monitoring all over the world. Bas1200ed on the analysis on previous landslide monitoring instruments, this paper designs a new kind landslide monitoring system, which Chuan Wu, Wen-qiao Wang, Guo-jun Wen and Xiao-ming Wu, MULTIPLE PARAMETER MONITORING SYSTEM FOR LANDSLIDE 1201 can monitor three parameters of different depth at a time: internal displacement, internal geotechnical pressure and pore water pressure. The system consists of three parts: mechanical structure, monitoring system and PC software. In this system the data collected by sensors are firstly stored in the SD card, and the user will be able to read the monitoring data at regular intervals instead of monitoring data changing timely, which can save labor, especially at the initial stage of landslide. At last laboratory testing has been done to verify the accuracy of this measuring system and the result satisfies the design requirements.