Abstract:Because of the characteristics of low consolidation degree， fracture， waterbearing， deformation and dissolution； according to the difficult coring， serious diameter reducing， borehole wall unconsolidation， interlayer high confined brine and natural gas in resources and environmental scientific drilling in Chaidamu Basin， it is important to improve coring efficiency and protect borehole wall. The special designed watersealing single action triple pipe coring tools and traditional pipe coring technology were adopted， and petroleum drilling technology and equipment， such as pressure grouting for blowout， were learnt to ensure the construction and experiment requirements of environmental scientific drilling.

Abstract:Borehole track plays very important role in the process of analyzing and solving borehole inclination problems. The polar iso-distance net, owing to its high engineering accuracy, vivacity and quasi three dimensional characteristics, can be used to picture and draw borehole track plane projections and to be helpful in providing detailed graphics information for analyzing borehole inclination law. By the case of some inclination survey data of curtain grouting testing borehole in an iron mine, the paper introduced the preliminary application of polar isodistance net in borehole track drawing and borehole inclination law analysis.

Abstract:According to the complicated stratum of molybdenum mineral in Luanchuan of Louyang, drilling technology was analyzed. The paper mainly discussed the working principle of full-hole reverse circulation drilling & drilling with casing technology, the drill assembly, experimental equipment, field work and field experimental result. It was proved that the combined application of DTH drilling with pipe and DTH reverse circulation drilling was more effective in this area.

Abstract:This paper introduces the drilling fluids and lost circulation control technology applied in Jinchang gold mine, and takes an example of diamond wire-line coring drilling well (ZK-0003) to illustrate the high efficiency, low cost and stable hole wall. The drilling fluid system had good effect of caving prevention and lost control with strong adaptability and suitable viscosity; the formed thin mud-cake was dense and tough, with which low carrying capability and serious water loss were solved in small diameter wire-line coring drilling.

Abstract:The paper introduced the acid well flushing measures for output increasing in barefoot interval of carbonate rock with the cases of 2 wells of Niutuo geothermal field in Hebei.

Abstract:According to the characteristics of lost circulation in drilling in Zhenjing oil field, the treatment methods were adopted for different cases. Time-controlled drilling and short pipe-trip was for the lost circulation in the quaternary loess layer, prevention and drilling with unidirectional pressure temporary plugging additive was for the lost in permeable sand-stone layer, composite cement slurry was for vertical fracture layer and bridge material + cementing was for serious loss. All of these lost circulation control technologies were proved effective.

Abstract:The paper introduced Chaoyanggou oilfield about the well structure characteristics, formation lithology and difficulties in horizontal well trajectory control. Based on these characteristics and deflection rates in different stratums, effective trajectory control scheme was designed; reasonable deflecting tool and drilling tool assembly were selected with reasonable drilling parameters and technology for shallow horizontal well construction.

Abstract:Pneumatic DTH hammer has disadvantage of low energy efficiency and high air consumption. Differential-volume DTH was presented in the paper, which was totally different to traditional pneumatic DTH hammer with two-side inlet-exhausted structure, the energy efficiency and work efficiency are anticipated 20% higher than DTH hammer.

Abstract:According to the urgent demands of deep wire-line coring drilling tube in geology prospecting industry in China, based on the analysis on the operation requirement and took the comparison to foreign popular materials in the same industry, traditional producing process of seamless steel tube was modified with new XJY850 sophisticated high-strength geological pipe material developed.

Abstract:The coal bed auger drilling was tested in Yangquan coal group with new type crawler hydraulic drilling rig. It showed that the auxiliary time of drilling was reduced and the drilling efficiency was improved. The drill and drilling tools brought advantages in this test, and a lot of construction cautions of auger drilling technology were summarized.

Abstract:The fractal theory is a common method to predict the unsaturated permeability. But the theory can not be used in the computing of unsaturated permeability of Gaomiaozi bentonite in confined condition. The microstructure of bentonite changed a lot in the saturation process, and this phenomenon can not be reflected in the equations of fractal theory. The micro pores and macro pores of bentonite changed a lot in the saturation process which is different with the common sand or clay. With the consideration of Kozeny-Carman equation, a semiempirical-semitheorytical unsaturated permeability equation considering the microstructure of bentonite has been proposed based on the SEM test and MIP test of Gaomiaozi bentonite. The new equation was used in the analysis of unsaturated permeability of Gaomiaozi bentonite in the confined condition.

Abstract:A finite element analysis is performed for a hollow pile by considering the interaction between the soil and the pile. The vertical ultimate loading capacity is calculated. Some measures such as laying geo-technical composite materials in cracks; increasing soil elastic modulus and cohesion; and filling the side of pile with gravel concrete and so on are proposed. The influences on the loading capacity are discussed in detail. The theoretical analysis can be taken as a reference to the engineering application of hollow piles.

Abstract:Numerical simulation was made on water filling preloading for reinforcement of oil tank foundation by finite difference program FLAC3D， and analysis was made on the deformation characteristics and the shape of large oil tank foundation. Comparison was made on the result and monitoring data with very good uniformity.

Abstract:A factory building was planed to be built in coastal soft ground. According to the site condition and soil characteristics, vacuum preloading was adopted for soft ground reinforcement. In-situ test data were systematically collected and analyzed in the construction and after construction, which proved that application of vacuum preloading was successful.

Abstract:Based on the analysis on construction methods for large-scale sea reclamation project in Beibu gulf and classification of mechanism of different rock and soil combinative characteristics; and according to the foundation treatment and construction experience of different projects in this area, the optimized methods of construction and treatment for different ground and foundation were summed up.

Abstract:The paper discussed the application of dynamic design and information construction method in deep foundation excavation reinforcement; the design and construction were optimized in the construction process with good effect.

Abstract:Reinforcement mechanism of cement mixing pile was analyzed based on pile body and pile-soil interaction principle, the design and calculation process of cement mixing pile for high-rise building were discussed and with the case of a cement mixing pile project, improvement of bearing capacity and deformation were explained. It was proved cement mixing pile was effective in application in foundation reinforcement.

Abstract:The paper discussed the requirement and significance of engineering investigation for the application of trenchless technology in the diversion of rain and sewage of urban drainage system. According to the analysis on comparison between specification of trenchless technology and routine municipal engineering investigation, engineering investigation characteristics of trenchless technology construction was learned. With the trial section project of the diversion of rain and sewage drainage system of Langfang city, analysis was made on the influence of earlier investigation upon late trenchless construction, and the importance to trenchless engineering design and construction by engineering geological investigation and underground pipe detection was clarified. In the end, the paper summed up the routine work of engineering investigation for trenchless technology construction to give the reference in the diversion of rain and sewage to more urban drainage systems.

Abstract:The author differentiates the definitions of land subsidence and introduces each induction factor briefly. Then, the author defines the construction engineering land subsidence. The author mainly discusses the mechanics, hazards, control criteria and research methords of construction engineering land subsidence. Control criteria principles and some advices of construction engineering land subsidence are put forward in the article. The analysis can provide actual guide on the research land subsidence and the design, construction of construction engineering.

Abstract:In view of the low drilling efficiency of elasticplastic dense mudstone in more than 400 meters of holes in north-situ leaching sandstone-type uranium deposits,research test was made on bit to improve the situation. Φ104 mm octagonal step rib bit was chosen for soft elastic-plastic dense smooth reddish brown and light green mudstone; Φ104 mm octagonal step rib bit was chosen for soft elastic-plastic dense gray mudstone; Φ104 mm staggered round flake PDC bit was chosen for brittle-plastic high dense black gray mudstone; Φ104 mm staggered round flake PDC bit was chosen for brittle-plastic high dense white mudstone; and Φ104 mm tooth shape PDC bit was chosen for hard-plastic high dense mudstone.

Abstract:The purpose of this thesis writing is talking about the studies on the controlled blasting demolition on chimneys in complex conditions by way of a practical demolition example of a 70 meters high chimney, on the scheme of controlled blasting demolition, incision of blasting as well as design of the directional windows and choosing blasting parameters. It provides the readers of the reference on the controlled blasting demolition on chimneys in complex conditions.