Roof caving is one of the most serious engineering disasters in underground mining activities of metal mines. It not only delays the progress of production, but also threats against underground workers.

The fracture of overlying key stratum results in decrease of the roof caving angle and the increase of periodic caving span and weighting intensity.

覆岩关键层的破断使工作面顶板垮落角减小、周期垮落步距和来压强度都增大。

A study on ore drawing and computer-based production scheduling in block caving method

自然崩落法放矿与计算机排产方法的探讨

Computer method for draw control in block caving mine

崩落法放矿控制的计算机方法

On Ground Pressure Control Method in Block Caving

自然崩落法地压控制方法探讨

Two step Drawing Research on Block Caving with Floor Pillar System

有底柱阶段崩落法的两步骤放矿研究

These results can be used as theoretical basis for design and practice of block caving.

为自然崩落法的设计与实施提供理论依据。

Present Status of Block Caving Development and Its Application Prospect in China

我国自然崩落法发展现状与应用展望

Ennis stood as if heart-shot, face grey and deep-lined, grimacing, eyes screwed shut, fists clenched, legs caving, hit the ground on his knees.

埃尼斯的心被狠狠地击中了。他面如死灰，表情扭曲，闭上了眼睛。双拳紧握，两腿一软，重重地跪在地上。

Gob of sublevel caving will not cause ground surface downgoing.

崩落法开采形成的空区不会对地表造成沉降危害。空区不用处理，可以任其冒落；

Based on the above analysis, we draw the following conclusions: 1 、 The main deformation zone is located to the uplift in the leading edge and the tensile cracks and caving ground in the middle and rear end of the slip mass.

综合以上分析研究，得出以下几个结论：1、爬家岩滑坡主要变形区域位于滑体前缘的隆起和滑体中、后部的拉裂缝及陷落区，其变形模式为滑移&拉裂型。

This article is aimed at researching low pressure complex caving ground in Jilin area, studied mechanism of formation instability, analyzed through X-ray diffraction mineralogical analysis and SEM imagery structural analysis.

本论文针对吉林油田低压复杂易坍塌地层，对地层的失稳机理进行研究，通过X&射线衍射矿物分析，扫描电镜成像结构分析等实验对易坍塌地层进行分析。

Caving properties and law of ore in block caving

自然崩落法矿岩崩落特性及崩落规律

Discrete Element Simulation of Ore Drawing by Caving Method in Mining

崩落采矿法放矿的离散元仿真

Research on applications of discrete element method in ore drawing for caving system

离散元法在崩落法放矿中应用的研究

Numerical simulation on disposal of abandoned stopes by means of ore pillar caving

矿柱崩落法处理采空区的数值模拟

It is found that the ore block caving can be predicted accurately.

结果表明：该模型能较好地预测矿体的崩落；

Research on the original body recovered from drawn-ore& from multi-drawpoint during ore caving

对多漏孔放矿放出体的研究

The structural parameters in pillarless sublevel caving such as sublevel height, sublevel drive interval and ore caving interval have a great influence on the ore recovery.

无底柱分段崩落法分段高度、进路间距和崩矿步距等结构参数对矿石回收指标影响大。

Distribute randomly cavia porcellus 36 into 3 groups: Fast-recovery Injury Liquid Membrane 、 Model group 、 Control group, they were experimented with treatment of acute soft tissue injury on;

将豚鼠随机分成3组：伤速康涂膜液组、模型组、空白组进行伤速康涂膜液对软组织损伤模型的实验；

Study on the Cavia Porcellus Fed with Eupatorium Adenophorum Spreng through Methane Fermented

紫茎泽兰沼气发酵后作饲料喂养豚鼠的研究