摘要
结构性黄土的抗拉强度通常较大,结构性黄土的土压力计算需要合理考虑其显著的抗拉强度,在已建立的可综合考虑结构性黄土拉剪与压剪破坏的强度准则基础上,针对不同破坏状态,分析土压力被动极限应力平衡条件,推导结构性黄土被动土压力计算公式,并与基于Mohr-Coulomb强度理论的朗肯被动土压力公式进行对比分析。研究结果表明:在被动土压力计算与比较中,基于黄土联合强度理论的被动土压力比基于传统的Mohr-Coulomb理论确定的朗肯被动土压力值小。由于Mohr-Coulomb强度理论高估了黄土的抗拉强度,导致被动土压力计算值偏大,而基于黄土拉、压剪切破坏特性建立的联合强度计算所得被动土压力值更接近实际。
The calculation of earth pressure is essentially an application of soil shear strength theory.The calculation of earth pressure around different soil strength is different. The tensile strength of structured soil need to be considered reasonably. Based on the theory of joint strength,which take consideration of tension and shear properties of loess simultaneously,the equilibrium analysis of passive limit stress state was conducted,then the new formulae of passive earth pressure were derived,and compared with Rankine’s passive earth pressure. The results show that calculation and comparison of passive earth pressure,the passive earth pressure based on the joint strength theory is smaller than Rankine’s passive earth pressure which is determined by traditional Mohr-Coulomb theory. Due to the overestimation of the tensile strength in Mohr-Coulomb strength theory,the value of Rankine’s active earth pressure is smaller,and the value of Rankine’s passive earth pressure is larger,but the theory of joint strength based on tensile strength of loess can reasonably evaluate active and passive earth pressure.
作者
郑文
李荣建
骆晗
ZHENG Wen;LI Rongjian;LUO Han(Department of Architectural Engineering,Yulin University,Yulin 719000,China;Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2020年第3期476-482,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51868075)
陕西省自然科学基金项目(2019JQ-349)
陕西省教育厅专项(20JK1012)资助。
关键词
结构性黄土
抗拉强度
联合强度公式
被动土压力
structural loess
tensile strength
joint strength formula
passive earth pressure
