差异风化型危岩力学模型及破坏机制研究

doi:10.16285/j.rsm.2015.01.027

›› 2015, Vol. 36 ›› Issue (1): 195-204.doi: 10.16285/j.rsm.2015.01.027

差异风化型危岩力学模型及破坏机制研究

陈维^{1 .2} ，徐则民¹，刘文连^{1, 3}

1. 昆明理工大学建筑工程学院，云南昆明 650500；2. 云南交通咨询有限公司，云南昆明 650031； 3. 中国有色金属工业昆明勘察设计研究院，云南昆明 650051

收稿日期:2013-01-10 出版日期:2015-01-12 发布日期:2018-06-13
通讯作者: 徐则民，男，1963年生，教授，博士生导师，主要从事斜坡演化方面的研究工作。E-mail: abc5100@188.com E-mail:chenxingyu1986623@163.com
作者简介:陈维，男，1986年生，硕士研究生，主要从事水文地质与工程地质方面的研究工作。
基金资助:
国家自然科学基金——云南联合基金重点项目(No. U1033601)；高等学校博士学科点专项科研基金(No. 20135314110005)。

Mechanical model and failure mechanism of unstable cantilevered rock blocks due to differential weathering

CHEN Wei^{1, 2}，XU Ze-min¹，LIU Wen-lian^{1, 3}

1. Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2. Yunnan Traffic Consulting Co., Ltd., Kunming, Yunnan 650031, China; 3. Kunming Prospecting Design Institute of China Nonferrous Metals Industry, Kunming, Yunnan 650051, China

Received:2013-01-10 Online:2015-01-12 Published:2018-06-13

摘要/Abstract

摘要： 差异风化型危岩多形成于由砂岩和泥岩等软、硬岩性组成的互层陡倾岩质边坡中，其崩塌破坏属地质灾害中的常见形态。以普洱渡危岩高边坡为例，推导出差异风化型危岩岩腔后壁泥岩压应力随岩腔深度增加而增大的计算公式。据普洱渡危岩高边坡地形地貌和地质构造特征建立了两类4种差异风化型危岩力学模型：第1类为主控结构面贯通率等于1时的泥岩基座压裂破坏型和转动破坏型危岩；第2类为主控结构面贯通率小于1时的坠落型和倾倒型危岩。利用岩石强度理论推导出研究区砂岩的二次抛物线型摩尔强度包络方程，以极限平衡理论和摩尔强度理论推导了4种危岩体在自重、地震力和裂隙水压力共同作用下的崩塌破坏判别表达式，并由此反演出危岩体的临界崩塌边界方程，得出危岩体崩塌边界（岩腔深度、危岩体厚度和高度、主控裂隙深度）之间的关系，为现场预测和判别危岩体的稳定性和崩落时序提供简便可靠的依据。

关键词: 危岩, 差异风化, 岩腔, 主控结构面, 破坏机制

Abstract: Differential weathering can cause unstable rock mass in rock slope with alternating strata. The alternating strata can be sandstone and mudstone and belong to the soft and hard rocks. The rock collapse damage is a common form of geological disasters. This paper uses unstable rock mass at Puerdu as case study. The calculation formula for the compressive stress of unstable hard rock block on the soft mudstone base is derived for the slope rock mass with cavity in the soft mudstone due to differential weathering. The stress increases as the cavity depth increase. According to the slope topography, geomorphology and characteristics of geological structure of unstable rock blocks at Puerdu, two kinds of four unstable rock mechanical models due to differential weathering are established. The first type is the type of mudstone base fracturing damage and rotational damage unstable rock block whose main control fissure connectivity rate is equal to 1. The second type is the type of falling and toppling of unstable rock block whose main control fissure connectivity rate is less than 1. The rock strength theory is used to derive the quadratic parabolic Mohr strength envelope equation for sandstone at the study area. The limit equilibrium theory and Mohr strength theory is used to deduce the collapsing damage and judgment expression of four kinds of unstable rock blocks under the gravity, earthquake force and fissure water pressure. The critical collapse boundary equation is derived for the unstable rock mass at the study area. The relationships among rock cavity depth, thickness, height and the main control fissure depth are also derived. Those results provide an intuitive and reliable basis for the prediction and judgment of stability and collapse of the unstable rock mass.

Key words: unstable rock, differential weathering, rock cavity, control fissure, failure mechanism

中图分类号:

P 642.21

陈维，徐则民，刘文连 , . 差异风化型危岩力学模型及破坏机制研究[J]. , 2015, 36(1): 195-204.

CHEN Wei ，XU Ze-min ，LIU Wen-lian , . Mechanical model and failure mechanism of unstable cantilevered rock blocks due to differential weathering[J]. , 2015, 36(1): 195-204.

参考文献

相关文章 15

[1]	冯君, 王洋, 吴红刚, 赖冰, 谢先当, . 玄武岩纤维复合材料土层锚杆抗拔性能现场试验研究[J]. 岩土力学, 2019, 40(7): 2563-2573.
[2]	郑安兴，罗先启，. 危岩水力劈裂分析的扩展有限元法[J]. , 2018, 39(9): 3461-3468.
[3]	杨琪，张友谊，刘华强，秦华，. 一种气泡轻质土路基受载-破坏模型试验[J]. , 2018, 39(9): 3121-3129.
[4]	马凯，尹立明，陈军涛，陈明，王自起，崔博强,. 深部开采底板隔水关键层受局部高承压水作用破坏理论分析[J]. , 2018, 39(9): 3213-3222.
[5]	郭昭胜，贺武斌，白晓红. 桩-承台-土复合受力体的拟静力模型试验[J]. , 2018, 39(9): 3321-3330.
[6]	胡杰，李术才，石少帅，李利平，刘进佩，刘洪亮，贺鹏. 隧道仰坡落石冲击模型试验研究与机制探讨[J]. , 2018, 39(7): 2527-2536.
[7]	马旭强，施锡林，尹洪武，杨春和，李银平，马洪岭，. 三轴压缩下含夹层盐岩破坏机制[J]. , 2018, 39(2): 644-650.
[8]	李韬，徐奴文，戴峰，李天斌，樊义林，李彪，. 白鹤滩水电站左岸坝肩开挖边坡稳定性分析[J]. , 2018, 39(2): 665-674.
[9]	滕尚永, 杨圣奇, 黄彦华, 田文岭, . 裂隙充填影响巴西圆盘抗拉力学特性试验研究[J]. 岩土力学, 2018, 39(12): 4493-4507.
[10]	贾金青，高军程，涂兵雄，张磊，王海涛，高仁哲,. 深基坑中压力型预应力锚杆柔性支护结构的离心模型试验研究[J]. , 2017, 38(S2): 304-310.
[11]	贾艳昌，谢谟文，昌圣翔，吕夫侠. 基于固有振动频率的滑移式和坠落式危岩块体稳定性评价模型研究[J]. , 2017, 38(7): 2149-2156.
[12]	唐礼忠，翦英骅，李地元，王春，邓丽凡，陈源. 基于微震矩张量的矿山围岩破坏机制分析[J]. , 2017, 38(5): 1436-1444.
[13]	武精科，阚甲广，谢生荣，谢福星，陈冬冬，. 深井高应力软岩沿空留巷围岩破坏机制及控制[J]. , 2017, 38(3): 793-800.
[14]	黄小福，张迎宾，赵兴权，余鹏程，邢昊，张珏，陈岩岩,. 地震条件下危岩崩塌运动特性的初步探讨[J]. , 2017, 38(2): 583-592.
[15]	张嘎，金红柳. 水位下降条件下土钉加固土坡破坏特性研究[J]. , 2016, 37(S2): 137-143.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

差异风化型危岩力学模型及破坏机制研究

Mechanical model and failure mechanism of unstable cantilevered rock blocks due to differential weathering

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 10