Av av helix pawg rau kev tsim kho
KHOOM UA LI CAS
Cov av av hauv pob zeb siv rau kev tsim kho, qee zaum raug xa mus rau cov hlua khi, cov ntsia hlau-piles, phaj nyaj taub hau, thiab cov hlau phaj nyaj yog cov hlau ntsia hlau-nyob rau hauv kev sib tw thiab av siv lub nplhaib uas siv rau kev sib cog sib sib zog nqus. Av av helix rau kev tsim yog tsim los siv qhov sib txawv ntawm qhov ntau thiab tsawg ntawm tubular hollow seem rau pawg los yog cov hlua khauj khaum.
General Bearing Capacity Equation
Tam sim no lub sij hawm, qhov tsim ntawm av helix pawg rau kev tsim kho feem ntau raws qhov kev tshawb xav ntawm General Bearing Capacity siv rau compression loading ntawm lub hauv paus. Terzaghi tus kabmob ntawm qhov muaj peev xwm qhov kev ntsuas kom paub qhov kawg ntawm qhov kev muaj peev xwm, raws li tau muab teev rau hauv feem ntau ntawm Foundation Engineering phau ntawv feem ntau yog hais txog:
qult = c'Nc + q'Nq + 0.5 v'BNγ
qhov twg:
qult = Qhov kawg ntawm qhov muaj peev xwm ntawm lub cev
c '= zoo cohesion
q '= zoo tshaj qhov nyuaj siab tshaj = γ'D
γ '= lub cev qhov hnyav ntawm av
D = qhov tob
B = inch ntawm helix
Nc, Nqa, Nqaij = cov kabmob muaj peev xwm
Cov lus sau txog kev siv Terzaghi Tus Kab Bearing Capacity qhov siab:
1. Vim hais tias B yog qhov tsawg heev rau av av hauv siab pawg rau kev tsim kho, txheeb ze rau feem ntau cov pob zeb, ib co engineers xaiv tsis quav ntsej txog lub sij hawm 0.5 vib nas this.
2. Hauv cov kwj deg uas muaj cov zauv hauv khaum hauv compressing, Skempton's (1951) Cov Hnyav Capacity Factor rau ntiav round helical daim hlau kuj tseem siv tau: NC = 6.0 (1 + 0.2D / B) <>
3. Lub qhov hnyav ntawm cov av yog qhov hnyav tag nrho (qhov ntub) qhov hnyav yog tias lub phaj nyaj yog saum lub rooj dej thiab qhov ceebtoom hauv tsev yog tias cov phaj nyaj qis dua hauv qab rooj dej.
4. Rau cov av nplaum nplaum xau nrog φ '= 0, Nq = 1.0; Rau sands, Nqis yog ib qho tseem ceeb ntawm txoj kev sib txhuam lus, φ '
5. Hauv tag nrho cov teeb meem, rau kev sib nraus thiab kev nruj nruj, qhov siab tshaj ntawm kev muaj peev xwm yog tswj hwm los ntawm cov kev dag zog ntawm tus Txuas Ntsia lossis Txuas Nkoj Thauj nrog raws li lub khw.
Cov kev pabcuam tseemceeb ntawm cov av hauv cov av hauv kev tsim kho xws li: lub sijhawm luv luv, kev yooj yim ntawm kev siv, kev yooj yim ntawm kev nkag, txo qis carbon foot, yooj yim tshem tawm thaum lub hauv paus tsis tsim nyog, txo kev ua haujlwm, thiab txo cov nqi.
Lawv kuj tsim nyog rau cov ntim cov thawv thiab lub nplaub tshev, vim li ntawd lawv kuj siv rau cov txheeb ze, cov paib, thiab cov txheej txheem tuav tseg.
Cim npe nrov: av hlau chiv rau kev tsim, Tuam Tshoj, tuam ntxhab, lwm tus neeg, lub Hoobkas, nqe, kev cai, tsim