工程建设标准强制性条文CPECSB4房屋建筑部分英文版Word格式文档下载.docx

1、Survey Specification for Rock and Soil Engineering GB 50021-941.1.12 Detailed survey shall provided detailed documents for rock engineering and technical parameters of rocks for design use in the light of different architectures or architecture groups. It shall also provide analysis and evaluation f

2、or rock engineering of architecture foundations and the proving of specific plans of foundation design, foundation treatment and the prevention and treatment of bad geological phenomenon as well. Followings are main works to be done:（1） To obtain general layout plan of architecture with coordinates

3、and terrain, the cleaned ground level of architectures, the nature, scale and structural features of the architecture, the possible type and size of foundation, the estimated depth of foundation and the special requirements for foundation design etc.（2） To clarify the origin, type, distribution rang

4、e, development trend and extent of hazards of bad geological phenomenon and to provide evaluation and technical parameters of rocks for the treatment.（3） To clarify the type, structure, thickness, slope and engineering features of each layer of soil within the area of the architecture, calculate and

5、 evaluate the stability and bearing force of the foundation.（4） For architectures need calculation for settlement, to provide parameters for calculation of foundation deformation.（5） For locations where the seismic intensity exceeds or equals to 6 magnitude, the category of ground soil and the categ

6、ory of ground shall be classified. For locations where the seismic intensity exceeds or equals to 7 magnitude, the earthquake liquefaction of saturated sand soil and saturated powder soil shall be judged and the index of liquefaction shall be calculated.（6） To clarify the concealment conditions for

7、underground water. When making design for lowering water for foundation pits, it is also necessary to clarify the amplitude and regularity of water level changing and to provide information of stratum penetration.（7） To make judgement of the corrosion to construction materials and metals by environm

8、ental water and soil.（8） To make judgement of possibility of fluctuation of foundation soil and under ground water in construction period and in service period and their influence to the project, also suggest the measures for treatment.（9） For excavation of deep foundation pits, it is necessary to p

9、rovide technical parameters regarding rock and soil required for making stable calculation and for the design of supports. Prove and evaluate the influence of foundation excavation and water lowering to neighboring projects.（10） To provide technical parameters regarding rock and soil for the design

10、of foundation piles and to determine the load for single pile.1.1.15 The depth of bore hole in detailed survey shall be calculated from the bottom of foundation and its value shall meet following regulations:（1） For the foundation calculated according to the load, the depth of bore hole shall contro

11、l the force-bearing layer of the foundation. When the bottom width of the foundation, b, is not more than 5m, the depth of the bore hole shall be three times the width of the bottom of strip foundation while for isolated foundation, it shall be 1.5 times. However, it shall not be less than 5m.（2） Fo

12、r foundations needed to check computations of deformations, the depth of control bore hole shall exceed the depth of settlement of foundation.（3） In case there is large area of stockpile load on the ground or there is soft sub base layer, the depth of bore hole shall be increased.1.1.16 The sampling

13、 and testing for detailed survey shall meet following regulations:（1） The number of taking-soil samples and the number for holes （wells） of testing at original position shall be determined according to the evenness and design requirements of the foundation. For buildings of Class 1 safety classifica

14、tion, it shall not be less than three per building.（2） For each location or each building of Class 1 safety classification, the samples of original soil of each main layer shall not be less than 6. The testing data at original position in the hole of same soil layer shall not be less than 6 groups.（

15、3） In major force-holding layer of the ground, taking-soil samples or original position testing in bores shall be made for the sandwich layer or lens layer with thickness over 50cm.1.1.17 Construction survey shall be made in association with design organization and contractor in one of following cas

16、es:（1） For buildings of Class 1 or Class 2 safety classification, inspection of construction of foundation pits shall be made.（2） After excavation of foundation pits, in case the conditions of rock and soil are not in conformity with original survey information, construction survey shall be made.（3）

17、 If caves or earth holes in ground are developed, they shall be clarified and suggestion for treatment shall be put forward.（4） If in construction there is danger of instability of edge slope, it shall be clarified and monitored.1.1. 18 The arrangement of exploring points in detailed survey for high

18、-story buildings shall meet following requirements:（1） Exploring points shall be arranged along the perimeters of the building. Corners and intermediate point shall also have exploring points.（2） The arrangement of exploring points shall meet the requirements for evaluation of stratum structure and

19、evenness both from radial and longitudinal directions.（3） For buildings with special shape, the exploration points shall be arranged according to the special shape.（4） The number of exploring point for single high-story building shall not be less than four.3.7.2 The survey for excavation of foundati

20、on pits and for supporting engineering shall meet following requirements:（1） At initial stage of survey for proposed main building, the feasibility of supporting shall be preliminarily determined according to rock and soil engineering conditions. At stage of detailed survey, special survey shall be

21、made to the projects need to support.（2） The range of survey shall be determined according to the depth of excavation and the rock and soil engineering condition of that location. Exploring points should be arranged out side of the boundary of excavation and to the depth of 12 times excavation depth

22、. For soft soil, the scope of survey shall be extended appropriately. The depth of exploring points shall meet the requirements for checking at different limit conditions.（3） Effective stress strength parameter of soil or the parameter or anti-shear strength without draining water shall be put forwa

23、rd according to the structure of stratum and the nature of rock. And soil. The influence to the soil by changes in stress caused by construction, the changes in conditions of strain and the underground water shall be evaluated.（4） The features of under ground water within the area of excavation and

24、nearby locations shall be clarified. It is also needed to clarify the influence to nearby buildings and facilities by changes in water level in construction. The estimation of the possibility of higher permeation and pipe surging shall be made. Measures for lowering water or isolating water in const

25、ruction shall be suggested.（5） The existing status and characteristics of nearby buildings and facilities and their bearing capability for vibration and their displacement caused by construction shall also be checked and clarified.1.8.1 Survey for rock and soil engineering of piles or mounds shall i

26、nclude followings:（1） To clarify concealment condition of rock and soil and their physical and mechanical features, the concealment depth, thickness, property and their changes of force-bearing layer and soft sub base layer.（2） When ground rock is used as foundation force-bearing layer, it is necess

27、ary to clarify the structure, property, extent of weathering and the thickness of the ground rock.（3） The hydro-geological conditions and the corrosions to pile and mound material caused by under ground water shall be clarified.（4） To evaluate the feasibility of sinking-pile. To prove the constructi

28、on conditions for pile or mound and their influence to the environment.6.2.2 In rock and soil engineering survey, if there is stratum, which contains water, under ground water level shall be measured.8.2.4 Exploratory boring shall meet following regulations:（1） The recovery drilling depth of non-con

29、tinuous core-taking drilling shall be less than 1m for spiral exploratory boring, while for rock core boring, it shall be less than 2m.（2） For the boring to verify natural humidity of stratum, it shall be drilled in a dry way above the level of under ground water. When it is necessary to drill with

30、added water or with circulation liquid, it shall use double-layer rock core pipe for drilling.（3） The rock core sampling rate in rock core boring shall not be less than 80% for general rock and not less than 65% for broken rock.（4） For fix-direction drilled bores, the inclination of the bore shall b

31、e measured section by section. The precision of measurement for inclination angle and orientation shall be respectively 0.1, 3.0.8.2.5 Records for field boring shall be made by personnel specially trained. The records shall be true and made timely and prepared as per each section. It is strictly pro

32、hibited to write afterwards. Specification for Engineering Geological Survey of Soft Soil Area JGJ 83-916.2.1 For the survey of foundation pits in soft soil area, care shall be taken in the excavation area to the displacement of earth caused by changes in stress field of earth and due to the nature of fluid of soft soil. Relevant measures and parameters for the bad phenomenon such as rebound of foundation bottom soil, side displacement and settlement of soil body in slope shall