Abstract:This paper introduced the configuration of hydraulic core drilling equipment and the drilling technology adopted in the demonstration project in Jinqingding gold mining area, summarized the research achievements of this project and proposed the recommendations about the development of deep core drilling equipment.

Abstract:The necessary of reaming drilling in scientific drilling was presented and the discussion was made on reaming drilling technology, the design of reaming bit, drilling tool selection and the structure design. The reaming drilling technology and the design of the bit and drilling tool for the deep hole scientific drilling of over ten thousand meters were put forward.

Abstract:The paper discussed the principle of drilling tools selection for deep hole to avoid downhole trouble; introduced the selection of drill collar, drill pipe, conversion joint and kelly; and put forward the reference suggestions to frequently encountered milling keyway in drill string, critical drilling pressure and rotating speed.

Abstract:By the comprehensive analysis on the advantages and disadvantages of pullout machines both in China and abroad, 200T hydraulic pullout machine was developed with domestic made hydraulic components, and comparison was made to imported equipment on the performance, service life and use cost. The machine can be used for joint pipe pulling in reinforced cement diaphragm wall construction of port, wharf and high building, and can also be used for lifting location in offshore workboat and operating platform.

Abstract:The paper introduced the calculation method for optimization design of hydraulic drill gear reducer by MATLAB software: with the assurance of overall gear ratio and bearing capacity, taking the minimum gear center distance and the minimum gear thickness as multi-objective, reasonable parameters of hydraulic drill gear reducer were obtained. The gear number and the center distance were reduced by 456% and 594% respectively after optimization.

Abstract:In the core drilling construction, downhole accident is unavoidable and the block of drill pipe, drilling tools and casing are frequently occur. Reverse thread drill pipe cannot get off the block at ideal position and the pipe cutter is commonly used to continue the construction to reduce the economic loss. A new pipe cutter was designed in the engineering practice with reliable working performance; comparing with previously used pipe cutters, it has characteristics of simple structure, easy operation, wide application range (pipe with minimum inner diameter of 60mm can be cut), high working efficiency and good generality.

Abstract:Staircase horizontal well is one way of horizontal well development, it has longer section and more control area, and it also can simultaneously mine different oil layers. Starting from the difficulties in well trajectory control and taking the example of well Jin 31-Ping 2, the paper introduced the geological design and well trajectory design schemes with the well trajectory control idea and methods. By the analysis on the key technology, the implementation focus and the supporting technical measures for staircase horizontal well were described.

Abstract:Diamond wire-line coring drilling and borehole protection by polyacrylamide non-dispersible solid-free fluid were used with several leakage control measures to deal with formation breaking, fracture development, leakage, collapsing, drill rod sticking and burying in Xihedaqiao gold mine of Gansu. The paper summed up the experience of drilling construction in this complex formation and put forward suggestions on reducing non-drilling time and improving drilling efficiency.

Abstract:The paper introduced the technical measures and effect of application of wire-line core drilling in sedimentary rock and soft rock construction for coalfield and sandstone-type uranium mineral drilling in Kuche and Wensu Counties of Xinjiang. The practice shows that wire-line core drilling technology can also take advantages of high drilling efficiency in sedimentary rock and soft rock formations drilling.

Abstract:Analysis was made on the causes of bit burnt accident. The technical treatment measures for bit burnt accidents were summed up according to the field situations, and the precautions were made clear.

Abstract:Great water content in coal seam was encountered in the construction of gas extraction drilling in Jincheng, aiming to the problems of bad in-hole ventilation, poor powder exhaust effect and the affection to borehole depth and hole completing rate, wide blade auger drilling technology with medium air pressure was adopted. The field test proves that this technology application is ideal in such construction conditions.

Abstract:The dynamic compaction design parameters were verified by the study on dynamic compaction test of red sandstone fill foundation in a substation, which provided the basis to foundation design. And the study was also made on dynamic compaction treatment applied in red sandstone area, which can be reference to design, construction and test of similar projects.

Abstract:Based on the analysis on the deep foundation pit shoring project of Shougang Jingtang Company in Caofeidian area, classification was made on foundation pit shoring methods with matrix method. Several suggestions were put forward to shoring and dewatering in Caofeidian area.

Abstract:Bedrock bench mark is a buried pole across the loose overburden layer to the stable bedrock for the accurate monitoring of land subsidence, which is with the characteristics of high requirement on mark hole and mark pole construction and accurate bedrock surface deciding. Based on the practice of 2 bedrock bench mark construction in Ningbo, discussion was made on the key technologies and control measures to ensure the quality of bedrock bench mark.

Abstract:Regarding to the features of large scale excavation, various types of enclosure protection and supporting, deep excavation and complicated structure in Fuqingbeilu station of the trial section of Ningbo metro, and by the study on the construction technology used, deformation analysis was made based on the monitoring data in the excavation process, the experience was summed up for the same type of project.

Abstract:Relying on the data of static load test on test pile in the foundation of a residensial building of Zhumadian and by the field data of static load test, the standard value of ultimate bearing capacity of single pile and the characteristic value of bearing capacity were determined. Comparing to the calculated value in Technical Code for Building Pile Foundations（JGJ 94-2008）, empirical formula proper to the driven grouting pile design in Zhumadian area was put forward, which could ensure safe and economic construction with production materials saving, and could be the reference to other pile foundation design.

Abstract:Deep foundation in the excavation process can lead to the deformation of surrounding surface. Because of the long excavation cycle and complex surrounding environment, it is important to monitor and control the deformation of surrounding surface subsidence. In this paper, combining the practice experience of surface subsidence control in the second stage of excavation project of Beijing urban rail transit control center, three-dimensional numerical analysis calculation model was established with ANSYS software. The calculation results tally basically with the measured data.

Abstract:A new rectangular driving machine is introduced about its design method and its main technical parameters, which is suitable for micro working well with jacking-pulling construction technology. Combining the pulling force of driving system with the driving machine, deflection and backward of the machine head are solved in common rectangular pipe jacking construction. The machine head is designed with multi-cutter, each cutter is positive inversion and rotary speed can be easily adjusted with less machine head deflecting. The new driving machine can also be operated only with jacking force.

Abstract:Kuiqi No.2 tunnel is belonged to tender section A3 of the phase II project of Fuzhou International Airport Highway. It is the first small clear space tunnel project for 8 lanes in China with the span of 19.9 meters and with the middle rock pillar of minimum clear distance about 11.7 meters. According to the specialty of Kuiqi No.2 tunnel and based on discrete element method, some numerical simulation analysis is conducted to analyze the initial surrounding rock stress to the tunnel. The results show that the worst position of mechanical state in large-section tunnel is in the upper portion of middle rock pillar in weak surrounding rock, so special reinforcement measures should be used there. According to the reliability value of middle rock pillar in different rock mass, the net distance between Kuiqi No.2 small clear space tunnels with super span is reasonable to satisfy the stability requirement.

Abstract:Based on the monitoring measured data and combined with grey theory, tunnel hole body displacement deformation system was established. The analysis was made on the stability of temporary supporting structure for excavation with cusp catastrophe method to build prediction model of tunnel collapse. The practical case of collapsing accident in Dujiashan tunnel showed the same result with that of prediction.