Abstract:Geothermal resources are clean and recyclable. Shortage of fossil fuels as coal, petroleum, natural gas and present pollution are threatening the development of commercial society and our living environment. In this case, it is significant to exploit and make use of clean geothermal resources. On the basis of “Resolution on Strengthen Geological Work” issued by the State Council, the author puts forward some suggestions, and points out that only if bring forth new ideas in fuels utilizing, the exploration and development of clean geothermal resources can be realized

Abstract:With the development of urban construction, underground space is developed and exploited largely and excavation engineering is widely used. Compared with other support patterns, SMW is more economically potential with many advantages, such as large wall thickness，great depth, good impermeability and environmental protection performance. In this paper, formed steel, antifriction material, characteristic of soil-cement, combination of SMW engineering method and design calculating method are analyzed and summarized. Based on the above, the future of SMW is prospected.

Abstract:The technique of soilnailing wall is widely applied in Beijing, and the composite support technique for soil-nailing wall and pre-stressed anchor can efficiently control the deformation. The design way and the applicability of this technique is illustrated with a field case, and analysis on some problems encountered during construction are made with the corresponding measures.

Abstract:The paper outlines combined supporting with pile anchor in deep foundation pit and high-pressure spiral jetting diaphragm, experiment on osmotic coefficient and anchor cable are made, and construction quality control is introduced.

Abstract:In plateau ever-frozen ground region with harsh climate and vulnerable ecological environment, various conditions of frozen soil layer bring difficulties to the construction of cast-in-place pile. To be up to the related standard of qualification, safety and environment protection, kinds of calamity initiated by the distortion, intensity weakness, cold expansion and melting breakdown caused by the frozen soil must be managed to prevent and remove. Construction technology of cast-in-place pile used for Buqu River is detailed. It is obviously different from normal technology used in land but effective in plateau ever-frozen ground and it can be referred to construction in similar geological conditions.

Abstract:The shortage of bearing capacity is often encountered in pile foundation construction in complex schist area. The main causes are studied with a typical case, and the problems that should be paid attention to at the similar stratum are also mentioned.

Abstract:东营黄河公路大桥主桥基础采用15 m超长钻孔灌注群桩，主墩基础钻孔桩长115 m，桩中心间距39 m。主要介绍主桥基础施工中对钻孔机具设备的优化选择和施工控制。

Abstract:讨论了回转钻进工艺、跟管钻进工艺、反循环回转钻进工艺、顶驱式回转钻进工艺以及振孔高喷成孔工艺在砂卵石层高压旋喷灌浆成墙中成孔施工适应性、有效性以及经济性。

Abstract:针对滨海潮间带复杂地层条件下冲击成孔灌注桩孔壁坍塌问题，依据工程实例，总结了几个解决的办法，效果良好。

Abstract:结合江苏省宜兴市天然气高压管网穿越蠡河的工程实例，介绍了利用中小钻机顺利铺设长距离的大钢管的施工工艺，同时介绍了非开挖铺管技术的一些决定工程成败的技术要点。

Abstract:With the advantages of reasonable structure, handy workmanship, wide adaptability, speedy construction and small cost, the technology of pre-stressed cable bolt has been used in various engineering construction. Good result is proved in a running year. The geological condition and stability analysis of the slope as well as the parameter design are introduced; the experience is summarized in the design and the construction procedure, which include drilling, putting cable, grouting, and tension locking.

Abstract:介绍了巴东县黄土坡滑坡与塌岸防治工程锚杆格构砌石护坡的结构设计、施工工艺及施工中控制要点。

Abstract:The present status and prospect of mineral exploration drilling market in China were summarized, and also the advantages and disadvantages and the comprehensive efficiencies of the conventional spindle drills and the fully-hydraulic top-drive head drills were discussed. Aiming to the actual situations and conditions of strengthening geological works brought forward by Chinese government, the author presented some viewpoints and proposals, which perfect and improve the present drilling equipment, increase the mineral exploration drilling efficiency, decrease the power consumption and the drilling cost.

Abstract:Wall of hole collapsing and breaking often happen in the process of drilling in limestone area, especially in mud-crystal limestone. It can affect the efficiency of drilling and even cause accidents. The relevant methods are put forward according to the evidences and features of collapsing and breaking, and can be referred by relative enterprises.

Abstract:由于第四系、二叠系、石炭系岩性复杂及缩径、坍塌、漏失等情况，山东淄博煤矿大口径超深定向排水孔成井难度大。该井采用了水泥注浆堵漏和水泥造壁稳定孔壁，应用“气举反循环＋垂钻”钻进工艺方法控制钻孔顶角，应用阶梯式组合牙轮钻头、水泥固井止水等技术方法，达到了设计要求。

Abstract:运城市地矿小区家属院深水井抽水时出现大量涌砂，经分析原因，制定了合理的堵漏方案，处理了涌砂现象，水质达到了漏失前标准。

Abstract:PDC drill bit manufactured by infiltration process with vibration does not work effectively in cobble interbed, a new type of PDC bit was developed because of the characteristics of high hardness, interbed, inhomogeneity and high abrasiveness. The structure of bit crown is of outside parabola-inside cone features with auxiliary cutting edges; and PDC is of non-plane, that is, multi groove binding has been adopted. According to the new design, 3 bits were produced and to be tried in 3 wells separately. It shows drilling efficiency increased by 26%, and the new type of PDC bit has advantages in drilling cobble formation.

Abstract:Blasting reaming damages the wall rocks and reduces the safety of tunnel retaining. Minimizing the thickness of loose ring at maximum can enhance tunnel retaining effect. Control blasting technique fits to soft rock tunnel, especially to coal tunnel and half-coal tunnel.