KIBVI TRA KM THUC ff CAC SAP TRAN CAO, AP DUNG CHO BAP TRAN CUA THUY BIBV LAI C H A U Nguyen Chieo'''', Nguyen Thai Binh Tom tit Dong chdy tren mat cdc dap trdn cao co luu tdc rdt l&n, ihu&ng gdy ra khi[.]
KIBVI TRA KM THUC ff CAC SAP TRAN CAO, AP DUNG CHO BAP TRAN CUA THUY BIBV LAI CHAU Nguyen Chieo', Nguyen Thai Binh Tom tit: Dong chdy tren mat cdc dap trdn cao co luu tdc rdt l&n, ihu&ng gdy hoa vd thuc trin mat trdn, ldm hu hdng dap Trong bdi gi&i thiiu phucmg phdp kiim tra hda vd thuc tren dap trdn cdc go ghe cue bp gdy Ap dgng tinh todn cho dap Iran Lai Chdu da chi duac phgm vi cd phdt sinh hda vd Ihur img v&i cdc trj so dp gd ghi cue bp khdc V&i cdc ddp trdn cao nhu dap Lai Chdu thi dii da sir dung vdt lieu Id be long mdc cao vd hodn thiin be mgl & cdp dp cao nhdt nhung khd ndng th\rc tren mgl phdn mat Iran la khdng trdnh khdi Do phdi dp dung cdc biin phdp di phdng thuc Tir khda; dgp trdn, go ghe cue bp, hda, thuc, luu toe Dat van de Hien chiing ta dang xay dyng nhieu hd ehiia thiiy Igi, thuy dien cd cdt nudc cao Vdi eac dip tran cao, xi lu se cd luu tdc tran mat tran rat Idn Chang ban d cac dap trin ciia thity dien San La, Lai Chau, xa lu thiet ke, luu tdc binh quan d cac mat { \ cat cudi tran dat tran 30m/s Trong kbi do, tran mgt trin ludn tdn tai cae gd gha eye bd cd nguon goc khic (do thi cdng, hay phit sinh thdi ki khai thic) Ddng chay cd Iuu tde Idn tran ba mat c6 gd gha cyc bg se Iam phat sinh hda, dan den tbyc phi hoai mat tran (hinb 1) I \ Hinh Khi ihicc trin mgl dgp Iran Brafxcaia (LB Nga) [1] a - Cdc phdn bf xdm thuc cita mat Iran; b - Hinh dnh hd xdm thirc Vi vay tinh toan thiat ka cic dip tran nhdt thiet phai lian hanh kiam tra hda, thyc va thiet ke giii phap phdng thue can thiat Van 6Q trudc diy chua dugc quan tim diing myc nen d mgt sd dap tran van hinh da cd xiy thyc (nhu d dap Plei Krong, Ban Chit ) Gin day, d nudc ta da ban hanh tieu chuan hudng dan tinh toan Trudng Dgi hgc Thuy Igi; ' Vi?n Ky thuat cong trinh, Dai hgc Thiiy lgi thye [3], va viee ngh'en ciiu de ap dung cho cdng trinh thyc te la rit can thiat, die bi?t la eho cac dap tran cao Phuong phap kiem tra hda va thyc mat tran 2.1 Kiem tra hda Khi hda xuit hien tren ba mit ldng din dudng bian ctia nd kbdng thuan, ton tgi cac vj tri ma dong chay kbdng bim sit thanh, tgo kbu vyc giam ap Ddi vdi be mat dap trin, hda cd the xuit hi?n d KHOA Hpc KY T H U A T THUY UJ\ VA M O I TRUOWG • S6 42 (9/2013) dgng tong the ho&c cyc bg Dgng tdng the ciia kbi tdng, dg bim kbi cita ldp nudc sat S = 0, hda xuit hi?n bin than be mat dip tran la mgt trj sd Vng xic djnh theo [3], cy the vdi be tdng M20, chay bao khong thuan ddng chay kbdng bim sit V„g = 9,2m/s; vdi be tdng M25, 30, 35, 40, tri sd Vng mat tran Day la cic dang mat tran cd chin khdng lin lugt la 12m/s; 14,lm/s; I6,4m/s va I8,5m/s Ddi vdi cic dgp tran eao, theo diau ki?n an toan Trudng bgp dy bio cd thyc (khdng thda man ,thucmg ip dyng logi mat tran khdng chan khdng dieu kien 4) thi ein thiat ka giai phap phdng thyc (dgng WES hoac Criger-Ofixerov, xem [1]) Do cho cdng trinh dgng kbi hda tdng the tran mat trin khdng xay Tinh toan i p dung cho dap tran thiiy dien Trong bai gidi ban nghian ciru hda tren mat Lai Chau tran ed cac gd ghe cyc bg 3.1 Gi&i thiiu cong trinb Thiiy dien Lai Chiu la bac thang tren eiing ciia Hinh dgng va kich thudc ciia cic gd ghe cue bg song Da, phan tran lanh thd Viet Nam Cdng trinh cd phy thugc vao edng nghe thi edng va xir ly mat tran Trong xay dyng thudng quy dinh cac cap hoan nhiam vy chinh li phat dien vdi cdng sual lap may thi?n be mat khic nhau; cap Fl- hoan thien tbdng 1200MW Dip tao hd chiia la dap be tdng trgng lyc tbudng, miic dg gd gha khdng che kbdng vugt qua cd chiau cao Idn nhit 137m Dap tran bo tri d Idng 7mm; cap F2- hoan thien cap cao, gd gha khdng song gdm khoang tran mat x 14,5m vi cira xa che khdng vugt qui 5mm; cap F3- hoan thien die sau, kich thudc ciia moi ciia BxH = 4x6m Trong bai nghien ciiu ve nang thyc d bi?t, go ghe khdng cha khdng vugt qua 4mm Ba mat dap tran ein dugc hoan thien theo cip Tuy dap tran (tran mat, xem hinh 2) Mgt sd thdng so ciia nhian, luu tde tran mat tran qua Idn thi tham chi dap tran nhu sau: - Mat cit dap tran: tran khdng chan khong kieu cac g6 gha cyc bg co chieu cao nhd han 4mm van cd WES Cao trinb ngudng tran: 275,0m; cao trinh miii tha tgo nen hda phun: 225,0m; gdc hit mui phun QH = 30*^; bin kinh Theo [3], hda xuit bien thda man diau cong ndi tiep: RH = 40,0m ki?n: - Mat bang tran: ngan each giua cac khoang la K