爆炸冲击作用导致岩体损伤的模型试验研究

岩土体开挖与围岩保护是岩土工程中两项重要内容,但在具体工程中普遍存在开挖和保护岩体的相互矛盾。本文针对以上矛盾来研究爆炸冲击作用导致岩体损伤及其力学特性的演化。文中采用实验室控制条件下的模型实验方法,在爆前及爆后对试件分别进行取芯检测,通过对芯样的各项力学性能指标的测量,研究爆破冲击载荷在预留岩体不同位置所造成损伤程度大小,同时还对现场采集的岩样进行了同样的试验研究。文中最后给出了利用试验所得出的各项结果来计算损伤变量值的方法,并且利用该方法计算得到了岩体在经过爆炸冲击载荷作用后的损伤值。该研究对于高陡边坡的爆破以及支护设计具有一定的意义。

Model experiment of the rock damage under blasting condition

Excavation and protection of the rock and soil is the two main task in geotechnical engineering. The contradiction between excavation and protection is widely existed in the engineering. The study of the damage in the retaining rock under blasting conditions is conducted. Model experiment method using drill sampling way is introduced in the laboratory. The damage extension of various positions in the retaining rock by blasting is studied through the test of the mechanical properties of the retaining rock before and after blasting. Also the samples collected from engineering field are tested and study of the test results is conducted. Calculating method of the damage parameter is represented to calculate the damage extension in the retaining rock after blasting. The damage extension in the retaining rock can be calculated to predict the situation in the retaining rock after blasting. All of the study is meaningful to the blasting and support design of the steep slope.