高邊坡路塹控制baopo施工技術.rar

高邊坡路塹控制baopo施工技術

　　 1、工程概況
　　國道**線**至**段改建工程L1合同段全長12km，土石方總量565000m3，有多處深挖石質路塹，其中**路塹（k1051＋720～k1052＋020）斷面底寬14.5m，最大邊坡高度33m，是全線最大的挖方段，路塹巖體為中元古界燧石條帶白云巖，節理裂隙發育，有松散的軟弱夾層，對邊坡穩定十分不利。該baopo工點緊臨國道**線，線路右側有密集村莊，施工環境比較復雜，對控制baopo的要求高，再加上工程量集中，工期緊，施工難度比較大。
　　2、baopo方案
　　路塹邊坡設計率從上至下為1：1、1：0.75、1：0.5，每10m臺階高度設置2m寬的碎落臺。根據工程特點，結合進度要求和資源配置等因素，采取按臺階高度分層分段多作業面同時開挖的施工方案，施工中采用深孔微差baopo技術，先拉通路塹主槽，兩側邊坡預留的1m～2m寬的巖體不爆，作為中部主爆體的隔墻，以減少大baopo對邊坡的損傷，同時預留的巖體光面baopo時，可以根據主爆體的baopo情況和巖石性質更準確地選擇baopo參數，提高邊坡的光爆效果。
　　2•1主爆區控制baopo參數
　　采用潛孔鉆機垂直鉆孔，鉆孔直徑d＝100mm，炮孔布置如圖1所示。
High Slope Controlled Blasting Techniques

1, Project Overview
National Highway ** line ** to ** Contract for Rebuilding the L1 segment length 12km, earthwork volume 565000m3, there are multiple root out the stone cutting, which ** Cut (k1051 +720 ~ k1052 +020) section bottom width 14.5m, the maximum edge slope height of 33m, is the largest excavation line of section, cutting rock for the Middle Proterozoic dolomite chert bands, joints crack development, with loose soft interlayer, on the slope stability is very negative. The point is close to National Road Blasters ** line, line on the right side dense villages, the construction environment is complex and demanding control of blasting, combined with concentrated quantities, construction period, construction of an easy task.
2, blasting program
Road cutting slope design rate from top to bottom as 1:1,1:0.75,1:0.5, each 10m wide and 2m height of the steps to set the House of Recollected Fragments Taiwan. According to engineering characteristics, combined with the progress of requests and the allocation of resources and other factors, the steps taken by a high degree of multi-layered sub-excavation work surface while the construction plan, construction of deep-hole Blasting by first cutting the main channel pull channel, on both sides Slope reserved 1m ~ 2m wide rock does not burst, as the central body of the main blast walls to reduce the large explosion on the slope of the injury, while reserve of rock blasting, you can burst under the main body blasting conditions and rock properties to more accurately select the blasting parameters and improving the slope of the light burst effect.
2 • 1 Main parameters of controlled blasting blasting area
Vertical drilling with hole drill, drill diameter d = 100mm, drill hole shown in Figure 1.
 

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