湿喷钢纤维混凝土在寒区边坡工程的应用

Wet-process steel-fibre shotcrete use in slope support in cold area

湿喷混凝土在体积、反弹及工作环境方面明显优于干喷混凝土。利用各种混凝土外加剂、硅粉、纤维加固的方法，能够产生高强度混凝土。测试结果表明，钢纤维可以替代100-150mm钢丝网衬砌，具有更大的韧性。具有早期强度高的钢纤维混凝土，通过应用遥控喷钻机，提高了施工效率。应用湿喷钢纤维混凝土比采用相同厚度钢丝网衬砌效率提高3～6倍。虽然钢纤维混凝土材料的成本约比钢丝网混凝土高70％～80％，因工效高最终成本节约10％～20％，岩锚与钢纤维喷射混凝土组合支护适用于临时和永久边坡支护。

Wet-process shotcrete is superior to dry-process with respect to capacity, rebound and working conditions. Use of various concrete additives, micro-silica and fibre reinforcement, together with general improvement of the method, have made it possible to produce high-strength concrete. Both test results and a great deal of experience show that steel fibers can successfully replace wire mesh in linings of thicknesses of up to 100--150 mm, giving linings which are at least equally strong and more ductile. Use of fibre- reinforced concrete with a high early strength, applied by remote-controlled shotcreting rigs, has considerably reduced the delay caused by shotcreting rigs. Applying fibre-reinforced concrete is 3 to 6 times faster than applying linings of the same thickness. Although the cost of the materials for fibre- reinforced concrete is about 70%--80% higher than the price of concrete and wire mesh, the final product may be 10%-20% cheaper. Use of fibre-reinforced shotcrete in combination with rock bolts is very suitable for combining temporary and final support.