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三、里排工点的几种控制爆破开挖法 里排工点的特点是工点长(K1958+450～K1959+050,全长600m),数量大(约12万方),新线与既有线两次不等高交叉,新线比既有线高7m,在穿过既有线部位为填方路堤,其余部位为挖方路堑。双线路堤宽10m,路堑宽9.6m。为解决交叉地段新线施工对旧线行车干扰,在正线右侧设便线。开挖新设正线与便线均需挖除既有线边坡,边坡高10～17m,坡度1:0.1～1:0.3(图7)。 本段石质为石灰岩,部分段落为泥质页岩,有明显的溶蚀沟缝,节理裂隙较发育,有
Third, several types of control points in the drainage row Excavation excavation method in the discharge point is characterized by long points (K1958 + 450 ~ K1959 +050, full-length 600m), a large number (about 120,000), the new line with The existing lines are not intersected with each other twice. The new line is 7m higher than the existing line. The embankment is filled at the site passing through the existing line and the rest is cut by the cutters. Double line embankment width 10m, cutting width 9.6m. In order to solve the cross-section of the new line of construction of the old line of traffic interference, set up the right line in the main line. Excavation of the new line and the construction of the existing line are required to dig the existing line slope slope 10 ~ 17m, slope 1: 0.1 ~ 1: 0.3 (Figure 7). This section of stone for the limestone, some of the paragraphs for the shaly shale, there are obvious erosion groove, joint development more fractured, there