CAJ | 학술논문

将生石灰粉与西藏邦铺矿区中所采取的碎石土混合，分别制成灰土比为3%，5%，7%和9%的改良碎石土，进行大型直接剪切试验，研究石灰改良碎石土的剪切强度特性和改良效果。试验发现：在碎石土中掺入石灰降低了土样的含水率、增大了土样的咬合摩擦和黏聚强度，从而增大碎石土的强度；掺量9%石灰改良碎石土效果最为明显。最后结合室内试验结果与理论公式，采用 FLAC3D建立的数值模型分析西藏邦铺矿区北东部剖面碎石土边坡在石灰改良碎石土层、锚杆护坡、抗滑桩护坡及以上方法联合护坡的治理效果。结果表明：石灰改良碎石土层、锚杆加固、抗滑桩联合护坡后，最大水平位移明显变小，没有贯通的塑性区，且有效地减小了下滑力，联合护坡方法较前3种单独采取某种方法时能更有效治理边坡。
장생석회분여서장방포광구중소채취적쇄석토혼합，분별제성회토비위3%，5%，7%화9%적개량쇄석토，진행대형직접전절시험，연구석회개량쇄석토적전절강도특성화개량효과。시험발현：재쇄석토중참입석회강저료토양적함수솔、증대료토양적교합마찰화점취강도，종이증대쇄석토적강도；참량9%석회개량쇄석토효과최위명현。최후결합실내시험결과여이론공식，채용 FLAC3D건립적수치모형분석서장방포광구북동부부면쇄석토변파재석회개량쇄석토층、묘간호파、항활장호파급이상방법연합호파적치리효과。결과표명：석회개량쇄석토층、묘간가고、항활장연합호파후，최대수평위이명현변소，몰유관통적소성구，차유효지감소료하활력，연합호파방법교전3충단독채취모충방법시능경유효치리변파。
By compounding raw lime powder with gravel-soil taken from mining area in Bangpu of Tibet,the largedirect shear test for improved gravel-soils with lime-soil ratios of 3%,5%,7%and 9%was conducted to investigate the shear strength of gravel-soils with lime improved and the improvement effect. The tests show that:as the moisture content of the soil sample reduces,the bite friction and cohesive strength of samples increases,the shear strength of gravel-soil increase with lime addition;and the improvement effect with lime-soil ration of 9%is best. Finally,based on the indoor test results and theoretical formula,the gravel-soil slope protection with lime improves,anchor slope protection,anti-slide pile slope protection and with the above method combined slope protection in North-east Bangpu of Tibet are analyzed with FLAC3D numerical model. It shows that the maximum horizontal displacement of slope decrease significantly,and with no breakthrough of plastic zone,and the glide force reduce effectively after using the gravel-soil slope joint protection with lime addition,anchor reinforcement and anti-slide pile. The joint slope protection method can be more effective than above three separate method.