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一、前言钢纤维混凝土是近年来混凝土工艺学上发展起来的一项新技术,国内、外在水利、交通、国防、冶金等部门对钢纤维混凝土的性能和应用研究方面做了大量工作,并取得了一定的成绩。它与普通混凝土比较具有优良的性能:弹性模量比较大,钢纤维在水泥基体中化学稳定性好,抗拉强度提高(如在混凝土中每立方米掺入钢纤维30kg,抗拉强度可提高21％,掺入80kg可提高68％)等,同时在满足某种技术要求时,经济上还有显著效益。风化岩石路堑边坡过去多采用水泥砂浆砌片石防护,就发展趋势而言,浆砌片石护坡,费料、费工,施工强度大、速度慢,特别在石料缺乏的地区,更不适应铁路建设的需要。因此亟待研究一种造价较低,施工方便,建设速度快的新型防护方法和材料。采用喷射钢纤维混凝土加固边坡代替传统的片石加固正是为此目的而探索。
I. Introduction Steel fiber reinforced concrete is a new technology developed in recent years in concrete technology. A great deal of work has been done on the performance and application of steel fiber reinforced concrete at home and abroad in such fields as water conservancy, transportation, national defense and metallurgy. Has made some achievements. Compared with ordinary concrete, it has excellent performance: the elastic modulus is relatively large, the chemical stability of steel fiber in the cement matrix is good, and the tensile strength is improved (for example, in concrete, the tensile strength can be increased by adding 30kg per cubic meter of steel fiber 21%, adding 80kg can increase 68%), etc., while meeting certain technical requirements, there are significant economic benefits. Weathered rock cut slopes in the past to use more cement mortar rubble protection, the development trend, the mortar rubble slope protection, cost, labor, construction intensity, slow, especially in areas lacking in stone, but not suited to the railway construction Need. Therefore, it is urgent to study a new type of protection methods and materials with low cost, convenient construction and fast construction speed. It is for this purpose that the use of jetted steel fiber reinforced concrete to reinforce the slope instead of the traditional stone slab reinforcement.