【正文】 have no less than 2 for control purpose. the depth of boreholes for control purpose shall perate the pression layer thickness below the pile end plane, and ordinary survey boreholes shall reach 3~5m below the pile end plane。 (4) Antiseismic intensity and ansiseismic class of the building。 (4) Antivibration and antinoise requirements for surrounding buildings and side slopes。 (6) Data of liquefied ground layer provided for the defence intensity for seismic protected zones。 (2) Physical and mechanic performance indicator values required for design of pile foundation for two limit conditions。 ψe — pile foundation equivalent settlement coefficient。 ψs, ψb — dimension effect coefficient of lateral resistance and end resistance of large diameter pile。 ηsp — group pile effect coefficient of overall pile lateral and end resistance。 γs, γp — partial safety factor of pile lateral resistance and end resistance。 hn — converted depth of pile。 Ac — area of cap bottom。 l — length of pile body。 Qngk — characteristic value of downdrag acting on any foundation pile of the group pile。 H — design value of horizontal force acting on the cap bottom。 γ, γe — unit weight and effective unit weight of soil. Action and action effect F — design value of the vertical force acting on the top of pile foundation cap。 m — proportional coefficient of horizontal resistance coefficient of pile lateral foundation soil。 Rh1 — design value of horizontal bearing capacity of posite foundation pile or foundation pile。 Qck — characteristic value of the total limit resistance of foundation soil at cap bottom corresponding to any posite foundation pile。 qpk — characteristic value of limit end resistance of a single pile。 Industrial Standard of the People’s Republic of China 建筑樁基技術(shù)規(guī)范 Technical Code for Building Pile Foundations JGJ 94 94 1994 Beijing I Industrial Standard of the People’s Republic of China 建筑樁基技術(shù)規(guī)范 Technical Code for Building Pile Foundations JGJ 94 94 Prepared by: China Academy of Construction Science Approved by: Ministry of Construction of the People’s Republic of China Implemented as of: July 1, 1995 II Notice on Issuance of Industrial Standard “Technical Code for Building Pile Foundations” Jianbiao No. [1994] 802 As required by the document from the former State Planning Commission Ji Biao Hang No. [1987] 78, the “Technical Code for Building Pile Foundations” piled by China Academy of Construction Science has been reviewed and is hereby approved to be a pulsory industrial standard with the number JGJ 94 – 94, for Horizontal force (F) as of July 1, 1995. This standard shall be managed by the China Academy of Construction Science, which exercises the centralized technical management of the construction engineering standards in the Ministry of Construction, and be interpreted by the Foundation Research Institute of China Academy of Construction Science. Any question or ments arising during its Horizontal force (F) can be informed to China Academy of Construction Science. This standard is published by the Standard Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People’s Republic of China December 31, 1994 III Table of Contents 1. GENERAL PROVISIONS 1 2. TERMINOLOGIES AND SIGNS 2 Terminologies .................................................................................................................... 2 Signs ................................................................................................................................. 3 3. BASIC PROVISIONS FOR DESIGN 5 Basic information ............................................................................................................... 5 Type selection and arrangement of piles ................................................................................. 6 Design principles ................................................................................................................ 8 Pile foundation under special conditions ................................................................................ 9 4. STRUCTURE OF PILE FOUNDATION 12 Structure of piles ...............................................................................................................12 Construction of cap ............................................................................................................17 5. Calculation for Pile Foundation .............................................................................................21 Calculation of pile top action effect ......................................................................................21 Calculation of pile foundation vertical bearing capacity ..........................................................22 Calculation of pile foundation settlement ..............................................................................38 Calculation of pile foundation horizontal bearing capacity and displacement .............................42 Pile body bearing capacity and anticracking calculation .........................................................46 Cap calculation..................................................................................................................50 6. CONSTRUCTION OF CASTINSITU PILES 58 Preparation before construction ...........................................................................................58 General provisions .............................................................................................................59 Bored castinsitu pile with slurry protection wall ...........