Abstract:Based on the introduction of the drilling technical requirement, analysis was made on drilling technique development of Ningxia geological industry in these 20 years about coring drilling equipment and technology. Outstanding problems in Ningxia geological industry were pointed out with the suggestion for drilling project in future.

Abstract:In order to improve the cold insulation effect of dry ice cold source of sampler, double-layer cold insulation method for dry ice cold source was put forward. It was proved by experiment that double layer cold insulation method for dry ice cold source could greatly prolong preservation time of dry ice in the hole bottom, and this method can be applied in the sampler design.

Abstract:This paper discusses the application of full-hydraulic track driller with automobile chassis in the arid and semiarid areas. According to the geochemical sampling requirement， full-hydraulic air-driven hammer drilling technology was adopted. The paper summarizes the experience， which made the drilling technology with air positive circulation and reverse circulation more perfect.

Abstract:According to the different geomorphologic types and geological conditions of sea beach, underwater slope and neritic zone, and based on the influencing factors of site investigation in the island and reefs sea area, the paper analyzed the drilling difficulties and available types of drilling field with the countermeasures proposed. The paper also introduced the construction practice and the achievement of Xihoumen bridge and a project in Daishan.

Abstract:SYZX75 wire-line coring hydro-hammer was introduced in compact, low abrasive hard rock bed with small particle, core blockage in broken formation and drilling difficulties in hard compact “skid” formation were overcome with high drilling efficiency and good-quality borehole.

Abstract:Experience was summed up about comprehensive control on complex formation in Xihuashan granite mine; the paper emphatically introduced the application method and the effects of wall protection and leaking stoppage with PAA polymer in fault fracture zone and hydration cataclastic rock. “Differentiation treatment” and “flexible application” were put forward to the control on complex formation for maximum low cost and high drilling efficiency.

Abstract:According to the characteristics of drilling operation in north Erdos, analysis was made on common existing PDC bit balling in field application with a set of feasible preventive measures.

Abstract:Well Yingshen 2 is the deepest natural gas exploration well of Daqing oilfield, which was finished drilling in 2008. According to the characteristics of Songliao area and based on the analysis on the main factors which affected drilling speed and safe drilling, research of optimized drilling design was made. Optimization design on well structure, optimal selection of bit and drilling technology were carried out for well Yingshen 2. The record was set for deep natural gas exploration well of Daqing oilfield with over 5500m depth, exploration breakthrough was made with nitrogen and oil-in-water fluid under-balanced drilling technology; low yield gas flow was obtained in the midway test and commercial gas flow was obtained while drilling completion.

Abstract:The drilling tool grading presents diversification in gas geological drilling technology in soft outbursting coalbed just because of different drilling medium, technology and accident treatment method. According to these characteristics, drilling tool grading was summarized with working experience for years, and analysis was made on some common problems of drilling tool grading with solutions.

Abstract:According to the national situation and based on the analysis on core drill both in China and abroad, YDX-2 all hydraulic core drill was developed. The paper introduced the drill about the technical route, technical parameter, structural feature and production test in field.

Abstract:Piston is a moving part of DTH hammer, which produces impact force to realize impacting breaking rock with complicated stress. Firstly, finite element analysis on the old piston that had been broken in the experiment was made with the ANSYS/LS-DYNA program to find out the cause leading to piston’s destruction; then new piston was optimum designed based on the analysis on stress and strain with finite element software.

Abstract:Advantages of fully hydraulic driving drill were affirmed by the application. Compared with spindle drill, the shortcomings were found out and the improvement suggestions were put forward.

Abstract:In watery karst mineral deposit mining, water irruption and water gushing are serious hidden troubles for safety. By the analysis on water accumulation conditions, characteristics of water diversion belt in karst and water disaster characteristics in karst deposit, the paper emphatically discussed the technology of survey and construction in water prevention engineering.

Abstract:Combined with a project of rock-socketed filling pile, and based on the influence of pile bottom sediment on the bearing property under the simulation of sediment at the end of the pile with elastic-plastic finite element method, analysis was made on the changes of load-settlement curves, axial force of the pile, shaft resistance, pile-end resistance and the total pile-shaft resistance. The load-settlement curves from the finite element simulation are consistent with the measured curves. The sediment at the pile bottom greatly reduces the pile end resistance, also reduces the ultimate bearing capacity of the pile and increases the settlement of the pile head.

Abstract:According to the research status of supporting structure with high-pressure jet grouting pile and composite soil-nailing wall, the paper put forward the selection reason of finite element numerical analysis software Plaxis8.2; discussed selection principle for soil constitutive model and supporting structure material model, and principle for parameter values and step-by-step calculation process. The calculation formula of related parameters for high-pressure jet grouting pile, soil nail and concrete surface layer were mainly given. The paper also studied contribution function of high-pressure jet grouting pile based on representative case example, and introduced application and verification of the above procedure in the design of high-pressure jet grouting pile and composite soil-nailing wall by an engineering case of shopping mall excavation.

Abstract:Based on the analysis on the dynamics and the cutting & mixing mechanism, the paper explained that the main factors which effect mixing uniformity of deep mixing pile body are the horizontal rotary velocity of the blade and the vertical motion, and analysis was also made on the effect of structure of stirrer to mixing uniformity. The approaches and measures to improve mixing uniformity were put forward.

Abstract:Abandoned pile foundation is constantly encountered during ground engineering construction; these old piles must be removed to insure successful construction of ground engineering. The paper introduced the mechanism and the method of abandoned pile removing, and discussed the technology, equipment, construction effect and some relevant construction problems. Casing drilling in abandoned pile removing has advantages of simple process, convenient operation, high efficiency and good construction effect with low cost, which could be widely applied in abandoned pile removing within φ1000mm.

Abstract:Cracks were found in the bottom filled wall and foundation beam of a building because the bearing capacity of pile foundation could not meet the design requirements, foundation beam+reinforcement scheme failed with foundation soil consolidation and negative friction of silt consolidation caused pile foundation subsidence. After analysis on these problems, cracks were filled by enlarging the size of foundation beam section, and by the reinforcement with anchoring static pressure piles.

Abstract:Advantages of vibrating hammer were brought into play while sinking steel supporting tube by vibrating hammer combining with rotary drilling rig in different construction environments and pile types, such as piling on land, in and under water, pile pulling, caisson, underground seepage wall and soil compaction in soft ground. And high velocity of rotary drilling rig was also fully played. It provided the reference for rotary drilling rig construction in similar ground.

Abstract:The horizontal directional intersection (HDI) technology effectively solves the problems that the long-distance crossing and the gravel stratum crossing can't be realized by the traditional horizontal directional drilling (HDD). This paper introduced the horizontal directional intersection technology and its application both at home and abroad, analyzed the crossing intersection guidance technology that was based on triaxial accelerometers and triaxial reluctance sensor in great detail; and intersection model was established based on the magnetic field generated from an axial magnet.

Abstract:By the detailed survey on the structure features of left bank resisting rock of Jinping-I hydropower, resisting rock chambers were classified with surrounding rock classification. 50% resisting rock chambers belong to Ⅲ2, about 36% belong to Ⅳ, and the rest belong to Ⅲ1 and Ⅴ. By the study on excavating destabilization, analysis was made on the stability-loosing mechanism and the deformation pattern. Weak-plane-controlling block gliding and collapsing were thought to be the main deformation pattern. According to the analysis on the chamber monitoring data, no evidence showed any abnormal; but deformation of F5, F42-9 faults and lamprophyre dyke were slowly occurred. The paper put forward the construction proposal.

Abstract:Dam material miming directly affects project progress of faced rockfill dam. Blasting direct mining technology speeded up the mining velocity compared with time and labor-consuming traditional technology. Blasting parameters were optimized by blasting tests. The paper introduced testing process with the analysis on testing result.