Abstract:In view of the present situation of rock and soil exploration engineering in China, the theories, experiences and economy are discussed in this paper. With reference to the practical specification of the rock and soil exploration engineering in Tianjin, foundation bearing capacity, anti-seismic sector-dividing and some relative problems are also discussed.

Abstract:It is important to ensure construction safety to monitor settlement of foundation pit and the round buildings. The fixed height datum are usually selected in settlement observation, the stable basic benchmark is needed consequently, the stability of the operating control point play an important part in connection survey and settlement calculation. The analysis method of basic benchmark and operating control point are researched. Based on the settlement observation in foundation pit construction, the stability of basic benchmark and operating control point are analyzed by the survey data of datum network and the connection survey data of basic benchmark and operating control point, the accuracy of settlement data of foundation pit and the round building are ensured.

Abstract:For the overdeep foundation pit of a fuel-burning power plant, which depth is about 2296 m, the comprehensive support works as soil nail, steel beam, sealing curtain wall were adopted to assure the safety of the foundation pit and the normal operation of the surrounding installation under the severe condition in winter. So the construction period was shortened, the cost was reduced and experience was accumulated for the large overdeep foundation pit designing and constructing.

Abstract:结合工程实例介绍了在基坑支护及地下室施工期间出现险情的处理方法。

Abstract:This thesis analyzes the advantages of the powder jetting piles for foundation pit retaining support in the soft stratum, and shows the design and construction techniques of the powder jetting piles by field cases. The ladder style retaining wall is designed by “m” method, which prevents the retaining wall from whole slippage and hunching effectively. In the process of construction, the repetition of jetting and mixing are carried out, so the supporting and impermeability of the retaining wall are strengthened.

Abstract:砂质地层和粘土层是钻孔灌注桩施工难度较大的地层，通过杭州海达大厦桩基工程实例，介绍砂质地层的扩孔保径和粘土层的特殊成孔工艺，解决了砂质地层缩径和粘土层钻进清渣难的问题。

Abstract:结合武汉移动通信枢纽楼工程，介绍了大直径钻孔灌注桩断桩事故的处理过程，分析了出现断桩的原因，给出了解决的对策。

Abstract:Down-the-hole hammer was used in the pile of rock foundation with auger drill, which not only make the most of DTH hammer in small diameter construction in hard, fragile, broken layer and auger drill in large diameter construction with high speed but also developed the field in rock foundation, and raised the efficiency of auger drill used for pile of rock foundation in mid-hard layer. This case provided the relative technique and experience.

Abstract:福建省招商局漳州开发区大多为块石填海形成的场地，填石厚度一般5～15 m，均匀性、密实性差，不能直接作为建筑物基础持力层，基础型式一般采用人工挖孔灌注桩，以中（微）风化花岗岩（埋深18～25 m）作为桩端持力层。人工挖孔灌注桩造价相对较高，工期相对较长。结合工程实例，介绍一种对素填土进行换填填石后，施工预应力管桩的基础形式，造价较低，工期较短，在一定的工程条件下可以给予推广。

Abstract:结合漳州污水处理厂污泥消化池工程实例，介绍了挤扩多支盘桩在南方饱和性土层中的施工技术方法及施工要点。

Abstract:In order to confirm the boulder foundation permeability of Liye embankment, the spot boring water injection was adopted to test permeability coefficient from fifteen hole segments in five sections. The test results show that the permeability coefficients of embankment foundation are generally big, and different in each spot on the same section. The permeability coefficient of front slope path of 1+070 section is four times that of back slope path, and the coefficient of front slope path of 1+470 section is ten times that on the axle.

Abstract:以新疆托卡依水库除险加固工程为例，详细阐述了劈裂灌浆工艺的原理和施工过程，总结了该工法的特点与规律，分析了工程的应用效果。

Abstract:通过工程实例介绍了在特殊条件下射水法和高压喷射两种工艺相结合进行堤基防渗处理的施工工艺及实施的效果。

Abstract:广西苍梧县城区防洪堤防渗墙遇较厚的砂卵石层，采用三重管高压旋喷注浆工艺，钻孔采用潜孔锤、硬质合金与金刚石回转钻进相结合，取得良好的防渗加固效果。

Abstract:通过对望峰岗矿井一副井井筒地层、井壁出水特点分析，给出设计依据；对造孔施工中特殊情况给出处理办法，对注浆堵水质量提出了评价方法。

Abstract:在山区高速公路高墩施工中，因地形复杂，材料垂直运输设备常用塔吊，其基础需作专项处理。结合工程实例,通过塔吊基础受力分析，介绍应用锚杆增加基础的抗倾覆力的设计及施工技术。

Abstract:Mechanism of inclination and causes of affecting precision of horizontal anchor hole are discussed. Mathematics model of rectify and control deviation is theoretically set up. How to increase precision in cable bolt boring is studied in construction technology and tools, selection to drilling parameters and technology.

Abstract:在黄石曹家湾滑坡治理工程预应力锚索施工中，通过改进施工工艺，采用风动潜孔锤偏心跟管钻进技术，合理安排施工工序，取得了较好的治理效果。

Abstract:Gravel strata is a kind of typical instable layer in drilling engineering. By the analysis of present drilling ways, and according to the characteristics of gravel strata, application feasibility is put forward for DTH hammer concentric simultaneous casing drilling tool in gravel strata, and analysis are made on the structure principle and characteristic of drilling tool. With reference to the experiment results, the DTH hammer concentric simultaneous casing drilling tool is considered to have extensive application prospect in gravel stratum.

Abstract:在徐家围子地区进行的深层天然气勘探中，由于深层岩石可钻性较差、岩石硬度大、温度高，常常会遇到各种复杂的情况，严重影响钻井速度。通过对深探井钻井进行统计，对影响徐家围子深探井钻井速度的主要因素进行分析，提出相应的可行性建议——合理优化井身结构、采用低压负压技术、推广应用复合钻井技术等技术措施，从根本上解决徐家围子深探井钻井速度，加快天然气勘探开发的步伐。

Abstract:Analysis is made on block effect to cutters of PDC bit with 3 factors: different top shape, cutter-distributing and wearing degree. By the interaction (radial range and altitude difference of each cutter) of three adjacent cutters, the cutter block is further analyzed with these factors, but wearing degree is simplified to be considered as the cutters vertical to the assembling plane.

Abstract:Real-time monitor is made to the groundwater with the completion of Xuefeng Mountain Tunnel. Inflowing model of triangular prism is reducted and tested to show its practice value.