Test Method rau Vertical Compressive Static Load Test ntawm Ib Leeg CFG Pile

Test Method rau Vertical Compressive Static Load Test ntawm Ib Leeg CFG Pile

CFG pawg (Cement-Yav tshauv-Gravel pile) yog ib qho kev sib xyaw ua ke ntawm lub hauv paus txhim kho lub cev, dav siv nyob rau hauv siab - nce lub hauv paus, txoj kev hauv nroog subgrades, industrial cog foundations thiab mos av txhim kho tej yaam num. Qhov ntsug compressive bearing muaj peev xwm ntawm ib pawg CFG yog qhov tseem ceeb ntawm kev ntsuas kev tsim qauv, kev lees txais kev tsim kho thiab kev kwv yees. Ib pawg ntsug compressive static load test yog qhov kev tso cai tshaj plaws thiab raug nyob rau hauv - qhov chaw kuaj xyuas txoj kev los xyuas qhov kawg ntawm cov kabmob, cov yam ntxwv deformation thiab kev ua haujlwm ntawm CFG pawg. Raws li JGJ 106, GB / T 50783, ISO 22477-1 thiab ASTM D1143 tus qauv kev qhia tshwj xeeb, cov ntaub ntawv no tau tsim kho cov qauv kev sim, cov khoom siv, kev npaj teb, cov txheej txheem thauj khoom, cov txheej txheem txiav, cov ntaub ntawv ua tiav thiab kev tsim nyog txiav txim siab cov cai ntawm CFG cov txheej txheem kev teeb tsa, kev ua tiav cov txheej txheem kev teeb tsa thiab cov txheej txheem kev txiav txim siab ntawm CFG pile engineering pile. kev tshuaj xyuas.

1. General Overview and Test Scope

1.1 Test Principple

Ib pawg ntsug compressive static load test siv cov qib thiab txhawb nqa ntsug static load rau pawg saum toj los ntawm cov khoom siv hydraulic. Los ntawm kev saib xyuas pawg saum toj kawg nkaus deformation deformation nyob rau hauv txhua theem load, lub load-kev daws teeb meem (Q-s) nkhaus thiab kev sib haum xeeb-lub sij hawm (s-lgt) nkhaus yog kos los ntsuam xyuas elastic-yas deformation txoj cai ntawm pawg lub cev thiab ntsug bearing kev ua tau zoo ntawm pawg-soil Qhov kev ntsuam xyuas tuaj yeem tau txais tus yam ntxwv tus nqi thiab qhov kawg tus nqi ntawm ntsug compressive bearing muaj peev xwm ntawm ib pawg CFG, thiab ntsuas seb lub hauv paus pawg puas tsim nyog thiab kev pabcuam kev nyab xeeb.

1.2 Daim Ntawv Thov Scope

Txoj kev sim no muaj feem xyuam rau kev soj ntsuam kev lees paub zoo, tsim qauv ntsuas ntsuas thiab ntsuas kev ua haujlwm ntawm CFG pawg tsim los ntawm kev co lub tog raj kheej, ntev kauv drilling thiab siv cov pob zeb ua pob zeb. Nws suav nrog ob qhov kev sim ntsuas: kuaj pawg kuaj xyuas rau kev tsim qauv pov thawj thiab engineering pawg kuaj xyuas kom tiav qhov kev lees paub, thiab yog qhov yuav tsum tau muaj kev lees paub txoj kev tshawb nrhiav rau kev sib xyaw lub hauv paus kev ntsuas kev muaj peev xwm.

1.3 Test Classification

Raws li engineering lub hom phiaj, qhov kev xeem tau muab faib ua qhov kev kuaj xyuas kev tsim qauv thiab kev lees paub kev kuaj xyuas. Kev kuaj xyuas tus qauv tsim yuav tsum tau thauj mus txog rau thaum pawg - av system mus txog qhov kawg ntawm lub xeev tsis ua hauj lwm kom tau txais lub peev xwm ntawm qhov kawg. Qhov kev lees paub yuav tsum tau thauj khoom mus rau ob npaug ntawm tus qauv tsim tus nqi txhawm rau txheeb xyuas qhov kev nyab xeeb ntawm cov pawg engineering.

2. Cov khoom siv ntsuas thiab kev teeb tsa

2.1 Cov khoom siv ntsuas tseem ceeb

Lub kaw lus static load test system muaj plaub lub hauv paus: loading system, counterforce system, displacement monitoring system thiab data acquisition system. Lub chaw thau khoom siv siab - qhov tseeb hydraulic jack thiab tsis siv neeg siab tswj cov roj twj kom paub qhov chaw thau khoom ruaj khov. Lub counterforce system txais cov thauj tog rau nkoj pawg counterforce lossis hnyav stacking counterforce los muab kev txhawb nqa ruaj khov. Kev tshuaj xyuas qhov chaw hloov chaw siv siab - qhov ntsuas qhov ntsuas qhov tseeb lossis cov ntsuas hluav taws xob xaim hluav taws xob los sau cov ntaub ntawv saum toj kawg nkaus. Tag nrho cov cuab yeej yuav tsum nyob rau hauv lub sij hawm calibration siv tau los xyuas kom meej qhov tseeb thiab traceability.

2.2 Field Layout Requirements

Cov pawg xeem yuav tsum khaws cia kom tsis txhob muaj kev puas tsuaj, tawg nto thiab pawg sab saum toj inclination. Cov pawg saum toj kawg nkaus yuav tsum tau polished tiaj tus thiab qib siab nrog siab -lub zog mortar kom ntseeg tau tias muaj kev ntxhov siab thaum thauj khoom. Cov kev txhawb nqa counterforce yuav tsum tau npaj symmetrically nrog cov pawg xeem ua qhov chaw, nrog rau qhov sib nrug txaus kom tsis txhob muaj kev cuam tshuam ntawm ciam teb. Lub ntsuas hluav taws xob hloov pauv yuav tsum muaj kev ywj pheej ntawm kev thauj khoom thiab kev tawm tsam kom tshem tawm cov kev cuam tshuam ntxiv deformation thiab xyuas kom meej cov ntaub ntawv kev sib haum xeeb ntawm pawg pawg.

3. Ua ntej-Test Preparation and Sampling Rules

3.1 Lub Sij Hawm Lub Sij Hawm Yuav Tsum Tau

Qhov kev kuaj xyuas zoo li qub yuav tsum tau ua tom qab lub pob zeb ua kom muaj zog ntawm CFG pawg ua tau raws li cov qauv tsim thiab pawg -cov av sib cuam tshuam. Lub sijhawm kuaj tom qab kev tsim kho pawg yuav tsum tsis pub tsawg dua 28 hnub rau cov txheej txheem av ib txwm, ua kom muaj kev txhim kho tag nrho ntawm pawg sab kev sib txhuam thiab pawg kawg ntawm cov kabmob, thiab zam qhov kev sib txawv ntawm qhov sib txawv los ntawm cov pob zeb tsis tiav thiab cov av tsis sib xyaw.

3.2 Batch Sampling Ntsiab Cai

Raws li kev soj ntsuam hauv lub tebchaws, qhov piv txwv ntawm CFG pawg static load test yuav tsum tsis pub tsawg tshaj 0.5% ntawm tag nrho cov pawg hauv tib seem kev tsim kho, thiab qhov tsawg kawg nkaus sampling kom muaj nuj nqis yuav tsum tsis pub tsawg tshaj 3 pawg. Rau cov hauv paus nrog cov txheej txheem geological nyuaj, kev siv tshuab tsis sib haum lossis cov pawg loj, cov qauv piv txwv yuav tsum tau nce kom tsim nyog los xyuas kom meej cov neeg sawv cev ntawm cov txiaj ntsig kev xeem.

4. Cov txheej txheem ua raws li tus qauv xeem

4.1 Chaw thau khoom xaiv

Txoj kev ua haujlwm qeeb qeeb tau txais yuav raws li tus qauv xeem txoj hauv kev rau CFG pawg static load test, uas yog tus qauv qauv rau engineering txais thiab cov ntaub ntawv calibration. Rau cov kev ua haujlwm tshwj xeeb xws li kev tshawb xyuas kev tsim kho sai thiab kev tshawb pom ntawm ntug dej hiav txwv, txoj kev kho ceev ceev tuaj yeem raug saws nrog cov qauv kho coefficients.

4.2 Loading Cov Cai

Qhov siab tshaj plaws kuaj load yog txiav txim siab raws li ob zaug ntawm tus qauv tsim cov kabmob muaj peev xwm. Tag nrho cov khoom thauj tau muab faib ua 10 qib sib npaug rau cov khoom thauj khoom. Cov qib thawj thiab qib thib ob yog ob npaug ntawm cov qib ib zaug kom nrawm nrawm ntawm pawg - av sib txawv. Cov loads tom ntej yog siv qib los ntawm qib nrog sib npaug ib qho load. Unloading yog nqa tawm nyob rau hauv rov qab graded hom, nrog ob chav graded load rau txhua theem unloading, thiab lub sij hawm unloading yog shortened correspondingly.

4.3 Cov Qauv Nyeem Ntawv thiab Kev Ruaj Ntseg

Nyob rau hauv txoj kev kho qeeb qeeb, cov ntaub ntawv hais daws yuav tsum tau nyeem ntawm 5min, 15min, 30min, 45min thiab 60min tom qab txhua qib ntawm kev thauj khoom, thiab tom qab ntawd nyeem txhua 30min kom txog thaum qhov kev sib haum xeeb ruaj khov. Tus qauv kev ruaj ntseg tus txheeb ze yog tias qhov kev sib haum xeeb nce ib teev yog tsawg dua 0.1 hli thiab kav ntev li 2 teev sib law liag. Tom qab txhua qib ntawm unloading, cov ntaub ntawv rebound yuav tsum tau nyeem nyob rau hauv lub sij hawm tas sij hawm ncua mus txog rau thaum lub rebound deformation yog ruaj khov.

5. Kev Xeem Txiav Txim Txiav Txim Siab

Kev ntsuas qhov ntsuas qhov zoo li qub tuaj yeem raug txiav tawm thaum ib qho ntawm cov qauv hauv qab no tau mus txog, nruj raws li JGJ 106 thiab GB / T 50783 specifications:

Qhov xwm txheej 1: Qhov kev sib haum xeeb deformation ntawm qib load tam sim no yog ntau tshaj 5 npaug ntawm qhov kev sib haum xeeb ntawm qib dhau los, qhia pom tseeb kev hloov pauv ntawm kev sib hloov thiab pawg hauv paus tsis ua haujlwm.

Qhov xwm txheej 2: Qhov kev txiav txim siab tam sim no tshaj li ob npaug ntawm qhov kev sib hais hauv qib dhau los, thiab qhov deformation tseem tsis tuaj yeem ncav cuag kev ruaj ntseg tom qab 24 teev ntawm kev thauj khoom, qhia tau hais tias tsis tu ncua yas tsis ua haujlwm ntawm pawg- av.

Qhov xwm txheej 3: Tag nrho pawg saum toj kawg nkaus kev sib hais haum tshaj 40mm, thiab tus nqi deformation yog txuas ntxiv nrawm, uas ua tau raws li lub hauv paus kev txiav txim siab tsis ua haujlwm.

Qhov xwm txheej 4: Qhov kev kuaj xyuas tau mus txog qhov kev tsim qauv siab tshaj plaws uas tau teev tseg, thiab pawg lub cev deformation ruaj khov yam tsis muaj cov cim tsis ua haujlwm.

Qhov xwm txheej 5: Cov xwm txheej txawv txav xws li kev tawm tsam ntau dhau, cov khoom siv tsis ua haujlwm thiab muaj kev nyab xeeb tshwm sim thaum lub sijhawm kuaj.

6. Tshaj tawm -Test Data Processing thiab Curve Analysis

6.1 Basic Data sorting

Txheeb xyuas tag nrho cov nqi thauj khoom, qhov tseeb- cov ntaub ntawv hais txog lub sijhawm thiab cov ntaub ntawv rov qab, tshem tawm cov ntsiab lus cuam tshuam tsis zoo los ntawm kev co sab nraud thiab kev ua haujlwm ntawm phau ntawv yuam kev, thiab ua tiav thiab txuas ntxiv mus kuaj cov ntaub ntawv qub.

6.2 Yam ntxwv Curve Drawing

Kos ob lub ntsiab lus nkhaus: load-kev sib haum xeeb (Q-s) nkhaus thiab kev sib haum xeeb-lub sij hawm logarithm (s-lgt) nkhaus. Q-s nkhaus qhia tag nrho cov kabmob thiab deformation yam ntxwv ntawm pawg; tus s-lgt nkhaus txiav txim siab qhov ruaj khov ntawm deformation thiab qhov tshwm sim ntawm kev ua tsis tiav nrawm.

6.3 Cov Cai Txiav Txim Siab Muaj Peev Xwm

Qhov kawg ntsug compressive bearing muaj peev xwm ntawm ib pawg yog txiav txim raws li qhov inflection point ntawm Q-s nkhaus thiab qhov hloov pauv ntawm s-lgt nkhaus. Yog hais tias qhov nkhaus muaj qhov pom tseeb qhov tob tob inflection point, lub load sib haum mus rau qhov inflection point yog coj raws li qhov kawg bearing peev xwm. Yog hais tias qhov nkhaus hloov maj mam yam tsis muaj qhov pom tseeb tsis ua hauj lwm inflection point, qhov siab tshaj plaws ntawm cov nqi thauj khoom yog coj los ua pov thawj. Tus yam ntxwv tus nqi ntawm cov kabmob muaj peev xwm yog ib nrab ntawm qhov ntsuas qhov kawg bearing muaj peev xwm, uas yuav tsum tsis txhob qis dua tus nqi tsim nyog.

7. Cov kev kuaj tsis zoo li qub thiab ntsuas kev kho

Kev Txiav Txim Siab Tshaj Plaws
Ua rau: Uncompacted pawg sab saum toj, tsis tiav consolidation ntawm lub hauv paus av, qhov sib txawv ntawm pawg saum toj thiab bearing phaj. Kev Kho: nruj me ntsis qib ntawm pawg saum toj kawg nkaus, ua ntej- compact lub hauv paus ua ntej kuaj, thiab xyuas kom meej tag nrho cov kev sib cuag ntawm lub loading system.

Cov ntaub ntawv deformation tsis ruaj khov
Ua rau: Sab nraud qhov chaw vibration, tsis ruaj khov counterforce system, unindependent displacement kev them nyiaj yug. Kho kom raug: cais qhov chaw kuaj kev vibration cuam tshuam, txhim kho cov cuab yeej tiv thaiv, thiab txais kev ywj pheej hloov chaw saib xyuas ncej.

Qhov txawv txav deformation
Ua rau: Kev txhim kho pob zeb tsis tiav, kev puas tsuaj hauv zos ntawm pawg pawg. Kho kom raug: Txuas ntxiv lub sijhawm txij nkawm, tshem tawm cov ntawv xeem tsis tsim nyog, thiab rov- qauv rau kev sim.

8. Engineering Qualification Standards Judgment Standards

Tom qab qhov kev ntsuas zoo li qub, yog tias qhov ntsuas tus yam ntxwv ntawm qhov ntsug compressive bearing muaj peev xwm ntawm ib pawg CFG tsis tsawg tshaj li qhov tsim nyog, pawg deformation ruaj khov, thiab tsis muaj qhov tsis ua haujlwm tam sim ntawd tshwm sim thaum lub sijhawm thauj khoom, ib pawg yog txiav txim siab tsim nyog. Yog hais tias ib tus neeg kuaj pawg tsis tsim nyog, nthuav cov sampling thiab rov- tshuaj xyuas yuav tsum tau ua. Rau cov khoom siv tsis tsim nyog, kev tsim kho cov txheej txheem, kev kho kom muaj zog lossis kev txiav txim siab batch rejection yuav tsum raug coj los ua kom muaj kev ruaj ntseg hauv lub hauv paus engineering.

9. Technical Summary

Ib pawg ntsug compressive static load test yog qhov tseem ceeb thiab kev pom zoo rau CFG pawg hauv paus kev ntsuam xyuas zoo. Standardized teb layout, graded loading txheej txheem, ruaj khov cov ntaub ntawv tau txais thiab scientific nkhaus tsom xam yog tus yuam sij kom paub meej qhov kev xeem tau. Cov txiaj ntsig kev ntsuam xyuas tuaj yeem cuam tshuam txog pawg- av kev sib koom tes bearing kev ua tau zoo, qhov kawg deformation tsis kam thiab engineering kev nyab xeeb npoo ntawm CFG pawg, muab cov txheej txheem txhim khu kev qha rau lub hauv paus kev lees paub, kev ntsuas kev tsim kho zoo thiab kev tsim qauv kev nyab xeeb, thiab zam lub hauv paus kev daws teeb meem, deformation ntau tshaj qhov txwv thiab kev nyab xeeb kev nyab xeeb hauv kev lag luam tom ntej.