Abstract:Caomiao area of Pengyang County is one of important sites of deep coal resource exploration at mountainous area of southern Ningxia. Lost circulation is very common during drilling, which induces borehole accident and mechanical failure, even leads to abandonment of the borehole. Analysis was made on countermeasures for leakage protection and sealing in different formations, and corresponding formulas and operating details were obtained through laboratory tests. Field tests were also made with representative of ZK7-1; it is showed the lost circulation was controlled effectively, the leakage protection and sealing technology could be popularized in similar geological condition.

Abstract:The paper mainly introduced the application effect and experience of lengthening coring barrel of SYZX75 wire-line coring hydro-hammer in fractured rock layer.

Abstract:Discussion and study were made on drilling technology for water inrush borehole combined with the treatment of flush accident in zK0406 borehole of Pulang copper mining area in Shangrila.

Abstract:Through many times of technical innovation and production practice, 3512 m drilling depth has been achieved by airlift reverse circulation drilling technology. Compared with the slurry positive circulation, leakage in target layer is controlled with higher efficiency, lower cost, easy wellwashing and completion.

Abstract:The paper briefly introduces the development of hydraulic top-dirve waterwell drill in China and abroad and briefly introduces the advantages and disadvantages of hydraulic top-dirve waterwell drill； The paper analyses the requirement of hydraulic top-dirve waterwell drill in China； Speeding up hydraulic top-dirve waterwell drill in the process of localization are proposed.

Abstract:The post-processing software of GJY grouting automatic recorder was used cooperatively with GJY grouting automatic recorder for collection, analysis and management of all kinds of grouting data. The article mainly introduced the software about its development background, function design, development platform, system framework, data structure, running platform, main functions, application effect and improvement measures in current engineering practice.

Abstract:It is very important to improve the groutability and the durability of grouting material applied to grouting engineering, especially in medium and fine sand formation. Silica fume is a grouting material with fine grain, good groutability, no-toxicity, high concretion strength and good durability. By the analysis on successive applications, silica fume is introduced in the use of grouting engineering, especially in medium and fine sand formation.

Abstract:According to the years construction experience, when the technology of pump pressure CFG pile in continuous auger drilling pipe is applied in the stratum of saturated clay in Zhengzhou area, a series of environmental problems would come forth, such as ground settlement around piles and adjacent buildings, pavement cracking and pipeline dislocation. By the comprehensive study on the mechanism of environmental problems caused by construction of pump pressure CFG pile in continuous auger drilling pipe, the countermeasures are put forward, and the adaptability evaluation on this technology in saturated silty soil is made.

Abstract:With the engineering case of ground treatment for complex soft interlayer of industrial base in land accretion of Beibu Gulf of Guangxi, and according to the specific characteristics of building structures, replacement detritus pile with dynamic compaction method was further applied with good effects in overcoming the large scale of differential settlement of the ground, crossbar drainage, compacting consolidation and improving the bearing capacity of bearing layer.

Abstract:Innovative application of airlift reverse circulation was introduced with the case of pile foundation engineering in oversized large railway bridge. And this technology can be used in different types of drilling machine with simple equipment.

Abstract:The paper discussed the principle of well distribution for deep well dewatering, selection and calculation of design parameters; analyzed influence on the environment by deep well dewatering and put forward the preventive measure; and summed up the experience in construction of deep well dewatering.

Abstract:“Two walls combined into one” means that single earth retaining structure is turned to be external wall of permanent basement structure. The paper introduced the construction case in complex surrounding environment and geological conditions with this technology. In super-wide and super-deep diaphragm wall construction, trenching stability, large diameter reinforcement cage hoisting and putting or drawing for fore shaft pipe were successfully performed, the experience was provided for super-deep diaphragm wall construction in downtown area.

Abstract:Advantages of SMW engineering method were highlighted through the comparison with row-pile supporting, diaphragm wall and several deep excavation (12~20 m) supporting. Overall introduction of this new method was made on design and construction.

Abstract:With the gradual perfection of supporting pattern, foundation pit support should not only ensure the stability of the slope but also satisfy the demands of control on distortion and ensure the safety of nearby buildings. But in practical application, collapsing accidents often happened due to many different factors. This article takes an example of slope engineering of Yashang international edifice in Changsha and introduces some reinforcing methods on slope instability in some certain condition.

Abstract:With engineering cases, the paper enumerated the complex geological conditions and the seawater influence to near-sea foundation pit construction, and introduced the solution and construction points.

Abstract:f14, f18 fault and lamprophyre veins are developed in the top arch of tailrace surge tank in underground powerhouse of Jinping I hydropower station, the fault and the influence line was exposed after excavation with broken rock, strong weathering and instable surrounding rock. Pre-stressed anchor cable was designed to strengthen the support for cavity stability and construction safety. The papermainly introduced the construction method for anchor cable with large-angle upward hole in tailrace surge tank.

Abstract:With the engineering case of ground grouting for water blocking in Jindi iron mine, the paper introduced the construction technology and technical measures on selection of grouting scheme, proportion of grouting materials, determination of parameters, grouting technology and grouting effect.

Abstract:Aimed at the difficult problems about removing drill dregs in trenchless laying, the reverse circulation technology, for the first time, is applied in the trenchless techniques. In the paper, the power of mud pump for removing the drill dregs in traditional trenchless technique and in reverse circulation technique have been theoretical calculated, the result show that the former is more than the latter. The reverse circulation cutting cleaning techniques applied in the practice trenchless laying have greatly improved the rate of removing dregs in borehole.

Abstract:Combined ANSYS program with calculation of rock and soil engineering, the paper discussed the principle of ANSYS simulation of slope excavation, construction method and operation steps, which was applied to the analysis on the stability of slope. Stress field and displacement field at the natural state and excavation support condition were calculated, detailed analysis was made on calculation results and qualitative evaluation was also made on slope stability.

Abstract:Influenced by fault structure, rainy season, steep upper slope and unfavorable geological conditions, potential wiggly slippage in K5+120～280 of secondary road of Chengjiang to Yangzong was considered. According to the engineering geology and hydrogeology, anti-slide pile, jet-anchor and drainage measure were applied for comprehensive treatment.

Abstract:The paper introduced slope treatment scheme and construction measures for Nei-Yi expressway (K43+200～K43+256). Besides pre-stressed anchoring cable, different treatment measures for each unstable rock mass were also applied: crack filling, rock cavity sealing and unstable rock support. It has been proved that the treatment scheme and construction measures are reasonable by time tested for more than 2 years.

Abstract:Drilling in hard and slipping formation has been difficult, the paper analyzed drilling fragmentation mechanism to determined the factors affecting drilling rate, and put forward the factors that should be considered in bit design with field tests.

Abstract:Large pipe-shed advanced support technology was applied in construction of tunnel collapsing section of Haoshanyu with large pipe shed diameter and difficult drilling conditions. The engineering quality was controlled by optimum borehole drilling technology, pipe shed parameters design and grouting process with successful experience.