基于L型回弹仪的岩石力学特性试验研究

doi:10.11872/j.issn.1005-2518.2022.04.005

Abstract

Abstract:

Determining the rock mechanical parameters by static experiments is of great significance for optimizing the open-pit bench blasting scheme and improving the blasting effect.Therefore，the rock mass in an open-pit copper mine in China was taken as the research object，by applying the HM-82L rebound hammer whose impact kinetic energy is 0.735 Nm，a large number of in-situ measurements of rock mass mechanical properties were conducted.Meanwhile，dozens of standard samples were prepared from the on-site rock core.On the one hand，the test of rock longitudinal wave velocity was carried out by using SET-PLT-02 ultrasonic testing instrument，and the uniaxial compression experiment was performed as well based on the MTS-322 hydraulic-servo mechanical testing machine.The result of field rebound measurement indicates that the rebound value of the porphyry at the southern end of the mining area is greater than that of the skarn at the northern end，and the rebound value gradually decreases with the increase of the weathering degree of the rock mass.In addition，the results of indoor physical and mechanical test show that the variation laws of rock wave velocity，uniaxial compressive strength and elastic modulus are generally consistent with the rebound value，it is shown from the fitting curves that there are linear positive correlations between P-wave velocity，uniaxial compressive strength and rebound value，whereas an exponential correlation is generated between elastic modulus and rebound value.All the fitting correlation coefficient indicate that it is reliable to estimate the rock wave velocity and basic mechanical parameters by using the rebound value.The achievements of this study provide a reliable methodology to quickly and reliably obtain the basic physical and mechanical indicators of the rock mass in the open-pit copper mine.

Key words: L-type rebound instrument, wave velocity, laboratory experiment, uniaxial compressive strength, elastic modulus, bench blasting

CLC Number:

TD164

Xianfeng XU,Pengfei XING,Yong WANG,Suihong WANG. Experimental Study on Rock Mechanical Properties Based on L-Type Rebound Instrument[J].Gold Science and Technology, 2022, 30(4): 550-558.

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参数名称	参数值
冲击能量/Nm	0.735
锤重/g	115
弹簧拉伸长度/mm	75
冲击棒半径/mm	25
外壳尺寸/mm	55×55×250
内存数据/个	4 000
单序列最大冲击数	99

测区编号	测点1~20回弹值
N-58台阶（强风化矽卡岩）	51.0	41.0	51.0	42.0	32.5	44.0	34.5	38.5	36.5	45.4
N-58台阶（强风化矽卡岩）	34.0	43.5	39.5	46.5	51.0	42.5	42.5	43.5	62.0	54.0
N-70台阶（中风化矽卡岩）	44.0	41.5	39.5	42.5	58.5	52.0	53.5	58.5	45.0	55.5
N-70台阶（中风化矽卡岩）	37.5	55.0	45.0	38.5	33.5	36.0	51.5	63.0	62.5	45.5
S-70台阶（弱风化斑岩）	39.5	61.5	60.5	59.5	62.0	50.5	49.5	48.5	58.5	39.0
S-70台阶（弱风化斑岩）	45.0	50.0	38.0	33.0	38.5	40.0	50.0	42.5	48.5	45.5
S-82台阶（斑岩）	51.5	52.0	50.5	57.5	43.0	50.0	54.0	65.0	55.0	63.0
S-82台阶（斑岩）	55.0	48.0	52.0	56.0	53.5	52.0	46.0	51.5	46.5	41.5

采样区域	岩样编号	直径/mm	高度/mm	密度/（kg?m^-3）	纵波波速/（m?s^-1）	单轴压缩强度/MPa	弹模/GPa
S-82台阶	A4-1	49.20	100.21	2 640.66	5 030	123.32	36.31
	A4-2	49.31	99.64	2 661.21	4 689	117.48	34.41
	A4-4	49.32	100.53	2 579.19	4 842	116.66	33.67
S-70台阶	B2-1	49.72	99.64	2 559.11	4 320	95.54	32.98
	B2-2	49.62	99.57	2 445.49	4 052	103.35	29.04
	B2-3	49.08	99.69	2 492.94	4 179	89.03	27.53
N-70台阶	C3-1	48.53	100.09	2 447.72	3 639	76.21	25.82
	C3-2	49.36	99.68	2 394.98	3 594	70.67	25.03
	C3-3	49.05	99.77	2 399.41	3 227	75.98	24.53
N-58台阶	D1-1	49.28	100.22	2 391.61	3 354	56.70	23.42
	D1-2	49.59	100.20	2 218.21	3 263	49.02	18.32
	D1-3	49.34	98.99	2 250.34	3 822	63.21	15.72

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Experimental Study on Rock Mechanical Properties Based on L-Type Rebound Instrument

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