Xác định kích thước tối ưu giữa hai đường hầm gần bề mặt đất có tính đến sự thay đổi hình dạng tiết

Thong tin khoa hoc cong nghe m o

/XAC OINH KiCH THI/OfC TOI UU GIUA HAI DUONG HAM GAN BE MAT DAT,

CO TiNH DEN SIT THAY DOI HIN H DANG TIET DIEN DUONG HAM

The determination of the distance between two transport

tunnels is very important problem and has an influence on the

stability calculation and tunnel designations. However, nowadays

In Vietnam, this problem has many disadvantages. This paper

introduces the study on the determination of optimal distance

between two transport tunnels with the consideration for their

shape changes based on the numerical method.

TS. IRAN TUA N MINH

Truimg D^i hQC Md - Dja chat

Ncs, NGUYE N VI£ T D|NH

Vi$n Khoa hQC Cdng ngh0 Mo - Vinacomin

Bi§n t^p: TS. Tnrong DCK DV

I.Datvdndl

Vigc xdy du'ng cdc dudng ham ddi dang td xu

hudng tit ylu trong qud trinh xay dgng cae

dudng him giao thdng ndi chung vd cdc dudng

ham vgn tai trong edng nghigp khai thdc md ndi

ridng. Vige xay dgng 2 dudng him ddi song

song, cung vdi cdc dudng him noi ngang giCpa

2 dudng him se ddp ung dugc nhu eau giao

thdng tot han so vdi vige xdy dgng 1 ham dan

vdi ede Idn phuang tign vgn tai qua lgi ngugc

chilu nhau trong dudng him, trdnh tinh trgng

ijn tdc trong him hogc khi ed sg el trong ham

thi phuang tign vgn tai ed thi luu thdng sang

dudng him bdn cgnh.

Trong qua trinh thilt k l thi cdng xdy dung cdc

dudng him ddi thi vigc xae djnh kich thudc tdi

uu eua tru bao vg giua 2 him, hay Id khoang

cdeh toi uu giO'a 2 ham duge xem Id cd y nghTa

Idn de dam bao tinh on djnh cao nhat cua 2

dudng ham, eung nhu chilu ddi cdc dudng ham

noi ngang giu'a 2 ham Id ngdn nhat.

Hinh 1. Hi thdng 2 dwOng hdm song song

trong thi/c td d Viit Nam

Bdi bdo gidi thi$u vige xde djnh khoang cdch

ti i uu giO'a 2 dudng him, va cd tinh din vigc

thay dl i hinh dgng tilt dign cua eae dudng him.

2. LTng suit biln dang xung quanh dudng

hdm trdn dan

Hign nay, bdi todn irng suit, bien dgng xung

quanh dudng ham trdn dan dd cd rat nhieu cac

tae gia d l cgp din, ed the k l din nhu Idi giai

cua Kirsh, Lame, .[7, 8]. Tuy nhien, theo Terza￾ghi va Riehart (1995), md hinh bdi todn phang

cho bdi todn trong mdi trudng khdng thuy tTnh

cd the dugc the hign nhu trong hinh 2.

Theo Terzaghi vd Riehart (1995) eae thanh

phan U'ng suit vd biln dang d diem bat ky xung

quanh dudng him trdn dan cd bdn kinh a vdi

dp igc thing dipng tdc dung P dugc xae djnh

bang ede bilu thirc sau:

0)

(2)

(3)

(4)

(5)

lE,r

(1 + 41-^00825 +4[l-i;')a)s

' 2E,r M l[l-4cos2«-4(l-v')cos2«

p(l

2E.

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