Study on Fine Blasting Excavation of Deep Underground

Study on Fine Blasting Excavation of Deep Underground

Deep Excavations | Intoduction to Deep Excavations

Deep Excavations 10.6310/JOG.201912_14(4).1 System stiffness is an index to estimate the lateral displacement of retaining wall for deep excavations in soft clay.

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Deep Excavations | Intoduction to Deep Excavations

Deep Excavations 10.6310/JOG.201912_14(4).1 System stiffness is an index to estimate the lateral displacement of retaining wall for deep excavations in soft clay.

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Rapid Excavation and Stability Control of Deep Roadways

For large underground coal mines producing 10 million tons a year, rapid excavation and stability of deep roadways are pivotal to ensure sustainable, safe, and efficient production. This paper provides a case study of Hulusu Coal Mine in Inner Mongolia, where roadway excavation speed was insufficient to meet production needs. Moreover, deformation in the roofs of the roadways …

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Comparative study of construction methods for deep

Jan 01, 2018 · To safeguard the metro tunnel, Chen et al. (2015) proposed a novel construction method of a divided alternate excavation method (DAEM) for the project by following the time-space effect. Fig. 1 illustrates the principle and concept of the DAEM by comparing to the slope excavation and the divided successive excavation. In the slope excavation as shown in Fig. …

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Influencing Factors of Disturbance Effects of Blasting and

Mar 03, 2021 · 2.2. Rock Failure Mechanism of Roadway Blasting. To study the impact of blasting and excavation disturbance in deep-well tunnels, it is necessary to study the propagation of vibrational waves during blasting, especially how blasting relates to the damage mechanism in rocks [].Livingston rock blasting funnel theory asserts that the amount of energy transferred to …

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A Case Study Examination of Two Blast Rounds at a Nevada

May 07, 2015 · Up to12%cash back · Blasting excavation disturbance is an important influencing factor related to the initiation and the evolution of the surrounding rock damage zone in deep-buried tunnels. Based on the excavation of auxiliary tunnels in the Jinping II Hydropower Station, the effect of blasting excavation disturbance on the surrounding rock damage zone in …

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Mechanism of Coal Burst and Prevention Practice in Deep

Coal pillar bursts continue to be a severe dynamic hazard. Understanding its mechanism is of paramount importance and crucial in preventing and controlling its occurrence. The extreme roadway deformations from the asymmetric isolated coal pillars in the central mining district of YaoQiao Coal Mine have responded with frequent intense tremors, with risky isolated coal pillar …

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A study on hollow effect and safety design of deep

In view of the influence of blasting excavation in the deep burial underground powerhouse on the dynamic disturbance and blasting vibration of side wall and surrounding rock, the blasting

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An analytical study of blasting vibration using deep

Jan 10, 2017 · For the study on the propagation–attenuation rule of the blasting vibration wave in the deep mining roadway of Shizishan copper mine, and the analysis of the influences of different maximum explosive charges and different underground systems on the propagation of blasting vibration signals, blasting vibration monitoring of the two different situations has been carried …

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Damage zones induced by in situ stress unloading during

Mar 19, 2021 · During the excavation of deep tunnels with high in situ stress, the stress unloading path caused by the rock mass excavation has important influences on the formation of the EDZ (excavation damage zone). In this study, the project background of the Jinping II diversion tunnels was firstly introduced. Then, the influences of stress unloading path induced by blasting …

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A study on hollow effect and safety design of deep

TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST DESIGN

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Deep Talks: Having a blast! on Vimeo

Before the experiment is built, crews need to remove more than 800,000 tons of rock to make space for the massive detectors that will be housed a mile underground at SURF. At "Deep Talks: Having a Blast!," James Rickard, resident engineer for the Fermilab Research Alliance, walked us through the excavation process—from geotechnical surveys

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Experimental Study on the Failure Characteristics of

Jul 14, 2021 · During underground excavation, rocks are generally subjected to weak dynamic disturbances caused by blasting, machine vibration, rockburst. To investigate the failure characteristics of hard rock subjected to weak dynamic disturbance, two types of tests, dynamic and static true triaxial tests, with different minimum principal stresses σ 3 (0.5, 5, 10, 15, 20, 25, …

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TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST …

NIOSH researchers collected basic data from two blast rounds at the SSX-Steer Mine as a component of a larger study on controlled blasting, the goal of which is to reduce injuries from falling rocks in underground mines. Drilling and blasting procedures at the mine were observed. Rock mass property

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A study of excavation sequence and contour blasting method

This article presents a systematic study on the effect of blasting excavation on the crossing caverns and surrounding rocks, based on the firsthand data …

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Case Study on Influence of Step Blast-Excavation on

Jan 26, 2015 · (1) Method of Blast-Excavation. The NBT is step-excavated by use the two side-wall pilot tunnel method, which is a kind of drill and blast method, and the sequence of excavation is shown in Figure 2. The parallel excavation is applied to side-wall pilot tunnel on both sides, and the distance of excavation face is more than 100 m to decrease

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Blasting For Underwater Rock Excavation | Download Books

Download Blasting For Underwater Rock Excavation Book For Free in PDF, EPUB. In order to read online Blasting For Underwater Rock Excavation textbook, you need to create a FREE account. Read as many books as you like (Personal use) and Join Over 150.000 Happy Readers. We cannot guarantee that every book is in the library.

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Study on engineering technologies in the Mizunami

Jul 15, 2012 · @misc{etde_22102986, title = {Study on engineering technologies in the Mizunami Underground Research Laboratory. FY 2008 (Contract research)} author = {Ijiri, Yuji, Noda, Masaru, Sasakura, Takeshi, Nobuto, Jun, Matsui, Hiroya, Mikake, Shinichiro, and Hashizume, Shigeru} abstractNote = {The researches on engineering technology in the Mizunami …

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6. Selected Case Studies | Geotechnical Site

CASB STUDY NO. 9 Naae of Project a Edward Hyatt Powerhouse (formerly Oroville Power Plant) Purpoaea Underground chamber for hydroelectric power production Locationa California (on the Feather River, 5 miles northwest of Oroville) Construction Perioda March 1964--June 1966 Site Investigation Perioda December 1959--october 1962 Sizea 550ft long

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A study of cut blasting for one-step raise excavation

Introduction. Over the past several decades, raise excavation has been widely employed in underground mining, civil engineering and military engineering.1, 2, 3 The technology of raise excavation can be generally classified into mechanized methods and conventional methods. 4 The mechanized methods included Raise Boring Machine (RBM) and Shaft Boring Machine …

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