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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

29卷

期数:

2012年03期

页码:

104-110

栏目:

出版日期:

2012-09-30

文章信息/Info

Title:

Stability Analysis of Weibei Pitted Loess Cave Dwellings in Rainfall Infiltration

作者:

韩佳明,苏三庆

西安科技大学 建筑与土木工程学院,陕西 西安 710054

Author(s):

HAN Jia-ming, SU San-qing

School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China

关键词:

降雨入渗;  渭北地坑黄土窑洞;  边坡;  稳定性;  含水率;  竖向节理裂隙

Keywords:

rainfall infiltration;  Weibei pitted loess cave dwelling;  slope;  stability;  moisture content;  vertical joint fissure

分类号:

TU761.2

DOI:

-

文献标志码:

A

摘要:

通过试验得到了土层中有竖向节理裂隙和无竖向节理裂隙2种黄土物理力学参数随含水率变化的规律。利用硐室围岩应力的表达式和莫尔-库伦强度准则给出了黄土窑洞安全系数的定义,分析得到重现期为10年,即有效降雨量为277 mm时的降雨入渗深度为286 cm,计算得到了窑洞安全系数最小值为1.183。当废弃窑洞覆盖土层中含有竖向节理,雨水可以直接到达窑洞周围土体,使含水率增大,力学参数降低,计算得到窑洞安全系数最大值为0.657。同时依据毕肖普条分法得到了分层边坡的计算公式,稳定安全系数最小值为5.537。结果表明:降雨量为277 mm时,无竖向节理裂隙的窑洞稳定,有竖向节理裂隙的窑洞破坏,边坡均处于稳定状态。

Abstract:

The law of two kinds of loess physical and mechanical parameters changing with moisture content whether loess with or without vertical joint fissure was obtained through experimental analysis. Safety factor was defined by surrounding rock stress expression and Mohr-Coulomb strength criterion. Rainfall Infiltration depth was 286 cm and the minimum value of safety factor was 1.183 while effective rainfall was 277 mm that return period was 10 years. Rain could directly reach the cave surrounding soil that the mechanical parameters reduced with moisture content increasing and maximum value of safety factor was 1.183 when abandoned cave overlying soil had vertical joints. Meanwhile, stratified slope calculation formulae were obtained by Bishop slice method that the minimum value of stability safety factor was 5.537. Results show that when rainfall is 277 mm, loess cave dwelling is stable without vertical joint fissure and is damaged with vertical joints, and the slope is in the steady state.

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相似文献/References:

[1]赵均海,殷 佳,张常光,等.降雨条件下非饱和朗肯土压力统一解[J].建筑科学与工程学报,2016,33(02):1.
　ZHAO Jun-hai,YIN Jia,ZHANG Chang-guang,et al.Unified Solution of Rankine’s Earth Pressure of Unsaturated Soil Under Rainfall[J].Journal of Architecture and Civil Engineering,2016,33(03):1.

备注/Memo

备注/Memo:

收稿日期:2012-06-17
基金项目:陕西省教育厅科研计划项目(08JK363,09JK570); 西安科技大学培育基金项目(2010033)
作者简介:韩佳明(1977-),男,陕西西安人,讲师,工学博士研究生,E-mail:jiaminghan@163.com。

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更新日期/Last Update: 2012-09-20