含软弱夹层岩体边坡爆破层裂特性及稳定性研究

Study of lamination property and stability caused by blasting in rock slope with weak intercalation

基于爆破相似理论建立含软弱夹层顺层岩体边坡爆破的力学模型,并介绍模型爆破层裂试验和剪切试验的设计思路及试验方法。以某石灰石矿采场黏土质夹层物为软弱夹层原料,通过相似模型试验研究爆破作用下含软弱夹层岩体边坡的层裂特性及稳定性。试验结果表明,爆破后可将软弱夹层分为爆腔区、压密区、影响区和无扰动区;爆腔区、压密区和影响区构成模型层裂区;爆前模型抗滑稳定安全系数最大、爆后次之、爆破过程中最小;层裂范围直接影响模型抗滑稳定安全系数。软弱夹层厚度对模型的层裂范围和抗滑稳定安全系数有较大影响。

Based on the blasting similarity theory, a mechanical model of consequential rock slope with weak intercalation is established. The design idea and method of the blasting model lamination test and shear test are introduced. Using the clay of one limestone quarry as weak intercalation, the lamination property and stability of the bedding rock slope with weak intercalation are studied through the similarity model test. The test results show that the weak intercalation after blasting is divided into four regions： blasting cavity region, tightness region, affected region and undisturbed region. The blasting cavity region, tightness region, affected region constitute the lamination region. The antislide safety coefficient is the greatest before blasting, the second after blasting and the smallest in the course of blasting. The lamination range directly affects the antislide safety coefficient of the model. The thickness of weak intercalation has a great impact on the lamination range and the antislide safety coefficient of the model.