Abstract:A comprehensive analysis on and comparison between spindle core drill and hydraulic top-drive core drill is made in this article. Special concern is focused on the technical economics in the drilling operation of the two types of the core drills. The result shows that hydraulic top-drive core drill is superior over spindle core drill not only in its light weight and portability, but also in its excellent drilling performance. With the increase of borehole depth, the comparative advantage of hydraulic top-drive core drill decreases. In this case, the length of drill rod stand should be increased to improve efficiency of round-trip operation.

Abstract:This paper gave a brief introduction to the development history of the rotary drilling techniques in China, the development course of homemade rotary drilling rigs and a detailed analysis on the market, including the amount and scale of the manufacturing companies, distribution of different products specifications, and technical capability of the products. In the last, the author brought forward some suggestions on the development of homemade rotary drilling rigs in future.

Abstract:丁集煤矿首采的11-2煤是突出煤层，在该煤层中掘进采用传统的边抽边掘措施，效率较低，矿井接替紧张。采用大功率钻机配合中风压专用空气压缩机施工大直径、长钻孔，有效地提高了消突效果，减少了打钻与掘进的工序转换，加快了掘进速度，缓解了矿井接替。

Abstract:阐述了ZYJ380/210型液压回转钻机的结构和特点，介绍了该钻机在贵州某高瓦斯矿的应用情况。

Abstract:Monitoring well with continuous multi-tunnel is a newly typed one without joints and leakage. The inside wall of shaft is smooth, the water filter-pipes are made on site, and pipes are installed by one-time operation. One monitoring well with continuous multi-tunnel can monitor multi-layer underground water; it becomes a new technology for monitoring on underground water pollution. The paper introduces the well completion technology.

Abstract:Expandable tube is a new technology and has been developed oversea. It can be applied in well drilling and completion for deep water, deep well, extended reach well and multilateral well, as well as in oil extraction and workover. This article briefly introduces the technology of well cementing with expandable tube and the tube material and property. The construction technology of the expandable tube is presented with the case of well Jing708.

Abstract:介绍了SYZX75绳索取心液动锤钻探技术在山东招远玲珑金矿区的使用情况；并对应用效果进行了分析；指出了存在的问题及改进建议。

Abstract:大庆油田徐家围子地区深层采用常规钻井机械钻速较低，试验气体钻井技术表明，能够大幅度提高深层钻井机械钻速，缩短钻井周期。通过前期的地质分析，在总结大庆油田已经试验的2口气体钻井现场试验的经验和教训的基础上，确定在徐深28井三开登娄库设计采用空气钻井技术，进入营城组试验氮气钻井技术，这是大庆油田第一口采用空气和氮气钻井的气体钻井。经过周全的设计，克服了冬季气温低、地层出水、气液转化井壁稳定等难题，保证了井身质量，机械钻速与邻井常规钻井相比提高了7倍，缩短钻井周期26天，节约钻头7只，尝试了氮气钻进营城组，取得

Abstract:介绍了山东大磨曲家矿区ZK9203钻孔夹钻事故的处理方法，总结了钻探卡钻、掉钻事故处理的技术措施和操作经验。

Abstract:冲击钻进工艺是对付基岩、卵砾石和漂石地层等复杂地层的高效钻探技术，可以提高钻进效率并有效防止孔斜，目前主要应用于大口径工程钻孔（一般直径＞600 mm），如钻孔灌注桩和水文水井钻探中。在河南省禹州市张得煤田预查矿区的钻进过程中，大口径冲击回转钻进工艺的应用有效解决了回转钻进导致孔斜过大的技术难题，并提高了钻进效率。

Abstract:A new patent technology of long auger rotary-jet mixing soil-cement curtain pile was introduced, which was especially applicable to the curtain between slope protection piles in stiff clay with advantages of the reliable technology, high construction efficiency, safety, economy and environmental protection. The application case of a foundation pit engineering of foreign students′ dorm in Peking University was presented.

Abstract:In the theory of pile vibration, one-dimensional assumption is not suitable for the large diameter pile. The influence of lateral inertial effect must be taken into account. This paper presents the solution of the motion equation of lateral inertial effect with Laplace transforms and develops the velocity response function under semi-sine wave exciting force at the level of pile tip. The paper also presents the analysis on the influence of lateral inertial effect of the dynamic response curves in the time-domain and its factors. Taking no account of the influence of pile material damping and the surrounding soil, it is found that both the velocity decreasing and attenuation of the stress wave are due to the lateral inertial effect. Meanwhile，different pulses and diameters also have an important influence on the lateral inertial effect.

Abstract:The result of pile tests on 14 piles with different lengths in 5 engineering cases shows that bearing capacity of single pile was quite different in the same construction site and with the same type of pile just because of different pile lengths and bearing stratums. The paper analyzed the conditions of bearing capacity of pile tip and time effect, when bearing capacity of pile tip was weak, lower bearing capacity of single friction pile could be reasonably explained by compressive pressure to pile or by A.S.Vesic theory.

Abstract:In the current criterion, different models of pile foundation settlement estimation should match with different determination methods of thickness of compressed layer. These methods were summarized with engineering cases; discussion and analysis were made on the thickness of compressed layer determined by different estimation models and the result of settlement estimation. The author thought the thickness of compressed layer could be determined by deformation ratio method if geological data of construction site were detailed mastered, otherwise by stress ratio method.

Abstract:According to the characteristics of cofferdam, control of grouting with static pressure casing was used for wall protection of borehole construction in unconsolidated formation and filled foundation to increase efficiency of borehole completion. Combined with casing location, grouting pressure and slurry ratio were adjusted to control the diffusion radius of grouting slurry and control the grouting location and grouting effect. The paper also introduced the application of control of grouting method with static pressure casing in anti-seepage for cofferdam of Dongqing hydropower station in Guizhou.

Abstract:以青藏铁路西格二线承压水处理工程为背景，通过几种止水方案的比较分析，得出深层水泥土搅拌桩帷幕加注浆技术在高原地区是一种非常有效的地下水灾害治理技术。介绍了其加固机理、施工工艺、施工中遇到的问题及采取的处理措施。

Abstract:结合桂海高速公路工程实例，阐述水泥混凝土路面凹陷开裂病害治理情况，分析路面出现凹陷开裂的原因，介绍水泥混凝土路面凹陷调平及开裂锚固综合治理的方法。

Abstract:结合浙江省余姚市东旱门隧道基坑围护工程，介绍了钻孔咬合灌注桩施工中常遇的质量事故的预防及处理措施。

Abstract:Trenchless technology for underground pipeline construction is a high technology, which is widely used in municipal construction, railway transport, electric-communication, conservancy and oil & natural gas transport. The paper discussed the main technical points of bedrock drilling, the design and selection of back reamers for different formations and drilling diameters, detailed construction technology of bedrock with typical engineering cases in China and prospected the future development.

Abstract:Hazardous wastes can cause great harm to the environment, so the design and the construction of hazardous waste landfill site demand higher standards. Design of impermeable layer is the central issue; construction should guarantee the design requirements with the highest quality. This paper summarized design and construction experience of hazardous wastes landfill sites in China, and the main points of design and construction were given to make hazardous wastes landfill location become really isolated from the biosphere in order to avoid secondary pollution.

Abstract:介绍了对陕西省镇坪县竹溪河街滑坡治理方案的优化选定过程，提出了4种方案进行对比分析，对确定的桩锚联合支挡方案及实施效果进行了论述。

Abstract:Service life and drilling efficiency of diamond bit were affected by hard rock, slipping formation and fluid leakage in gold mine of complex stratum. It was proved that JBD-75S bionic diamond bit has more advantages for drilling in complex stratum than other types of bit by field optimizing experimental research in Zhaoyuan gold mine of Shangdong Province.

Abstract:Construction technology of small internal tunnel is more favorable because of its simple and economy than double-arched tunnel without limitation on topographical condition and line type. Numerical simulation was made on the thickness of mid-pillars in small internal tunnel with finite element method; fitting curve of maximum tensile stress, yield function criteria and small interval was obtained through Griffith damage criteria and Drucker-Prager criteria. And analysis was made on most reasonable interval of small interval tunnel.

Abstract:Feasibility was studied on directional hole applied in grouting consolidation for tunnel in soft surrounding rocks with the comparison to traditional grouting hole.

Abstract:Combined with an engineering example, the paper detailed pipe-roof curtain grouting technology used in the construction of coal mine tunnel in the fractured zone which is full of high-pressure gas.