GB/T 51238-2018 in English

VALID

Techinical standard for building foundation in karst area

Issued on:2018-11-01
Implemented on:2019-04-01
File Format:PDF
Delivery:Via email within 10 business days

Price(USD)： $1,270.00
$1,232.00

Standard No:	GB/T 51238-2018
Document status:	VALID
Title in English:	Techinical standard for building foundation in karst area
Title in Chinese:	岩溶地区建筑地基基础技术标准
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 10 business days
Issued on:	2018-11-01
Implemented on:	2019-04-01
Professional Classification:	GB-National Standard
Related Keywords:	loose soil pile foundation method karst foundation treatment technologies techinical standard secondary measurement standard karst development degreehigh development
Related Topics:	basic technology basic building materials basic technical components The basis of the standard curve karst District building the basement building foundation Building foundation inspection regulations GBT51238 GB/T 51238-2018 foundation general purpose building foundation Technical specifications for building foundations db21/t907-2015 Basic technology for building foundations in karst areas White ground cooked ground standard ground Pile foundation technology in karst areas Korean foundation

Introduction

Analysis of the core content of the specification

Chapters	Key technical points	Key indicators
Exploration and evaluation	Three-level classification standard for karst development degree	High development is indicated when the drilling hole rate is ＞30%
Red clay foundation	Determination of the depth of the layer with sharp atmospheric impact	The buried depth of the foundation should be＞1.5m
Stability calculation	Verification of the safe thickness of the cave roof	Bending safety factor ≥1.35

Comparison of karst foundation treatment technologies

Filling method: Suitable for caves with a height of less than 3m, using C20 concrete or foam lightweight soil (foaming ratio 800-1200)

Spanning method: The span of the beam-slab structure should be greater than 1.5 times the diameter of the cave, and the supporting surface needs to be cleared of loose soil

Pile foundation method: The pile end enters the stable rock layer ≥3 times the pile diameter, and the cave section needs to use steel casing to stop water

Construction monitoring requirements

Settlement observation accuracy: Secondary measurement standard (±0.5mm)
Water level monitoring frequency: Once every 2 hours during precipitation
Pore water pressure measurement point spacing: 2-5m vertical arrangement

More samples: JC/T 2453-2018 JGJ 94-2008 DL/T 368-2010

Sample only — not a preview of GB/T 51238-2018

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