| 地应力对坝肩槽预裂爆破成缝的影响研究 |
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| 引用本文： | 邓珂,陈明,卢文波,严鹏,冷振东.地应力对坝肩槽预裂爆破成缝的影响研究[J].岩土力学,2019,40(3):1121-1128. |
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| 作者姓名： | 邓珂 陈明 卢文波 严鹏 冷振东 |
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| 作者单位： | 1. 武汉大学 水资源与水电工程科学国家重点实验室，湖北 武汉 430072；2. 武汉大学 水工岩石力学教育部重点实验室，湖北 武汉 430072 |
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| 基金项目： | 国家自然科学基金资助项目（No.51479147，No.51779193） |
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| 摘 要： |
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| 关 键 词： | 坝肩槽 预裂爆破 地应力 裂纹 岩体 |
| 收稿时间： | 2017-10-13 |
Investigation of influence of in-situ stress on presplitting induced fracture in abutment slot |
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| DENG Ke,CHEN Ming,LU Wen-bo,YAN Peng,LENG Zhen-dong.Investigation of influence of in-situ stress on presplitting induced fracture in abutment slot[J].Rock and Soil Mechanics,2019,40(3):1121-1128. |
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| Authors: | DENG Ke CHEN Ming LU Wen-bo YAN Peng LENG Zhen-dong |
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| Institution: | 1. State Key Lab of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2. Key Lab. of Rock Mechanics in Hydraulic Structure Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China |
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| Abstract: | Main concerns in rock engineering are the influences of in-situ stress on the quality of contour surface and its corresponding distribution area after rock blasting and excavation. This paper aims at studying the reason for the occurrence of hanging feet at the corner of right bank abutment groove of Baihetan hydropower station after pre-split blasting excavation. Theoretical analysis is firstly applied to explain the influence of in-situ stress on crack propagation during the stage of explosion stress wave and detonation gas respectively, and then numerical simulation is used for verification. Results show that in-situ stress guides the direction of initial crack propagation during the stress wave stage, while the in-situ stress perpendicular to fracture face inhibits the crack length expansion during the detonation gas stage. Moreover, the higher the in-situ stress, the more significant effect on the initial crack propagation direction and final length. Since the connection direction between blast-holes is inconsistency and in-situ stress is high at the corner of the abutment groove, crack extension deviates the expected direction and is difficult to penetrate at last. Finally, the hanging feet is formed. It can be seen that the in-situ stress seriously affects the quality of the pre-splitting blasting seam, which further causes the phenomenon of blasting and hanging feet at the corner of the abutment groove. |
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| Keywords: | abutment slot presplit blasting in-situ stress fracture rock |
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