开挖边坡-坡顶建筑物稳定性研究

开挖边坡时,为了确保边坡和坡顶建筑物安全,避免潜在滑坡危险,需对边坡-坡顶建筑物稳定性进行评价。通过MIDAS GTS建立边坡数值模型。基于Mohr-Coulumb屈服准则和强度折减理论对边坡-坡顶建筑物的稳定性进行了数值模拟,研究不同开挖深度边坡的应力分布特征及坡顶建筑物位移特征,揭示了边坡-坡顶建筑物失稳机理:随着建筑物-坡顶距离的增大,一方面开挖边坡的安全系数虽没有降低,但可以减小潜在滑动体的范围,提高建筑物的安全性,另一方面虽建筑物总体位移逐渐减小,但建筑物前后端的位移差逐渐增大,对建筑物的抗裂性不利。

Study on slope top building stability in excavation

To ensure the safety of slope and slope top buildings in slope excavation process, it is necessary to assess the slope stability. Based on Mohr-Coulumb yield criteria and strength reduction theory, a numerical simulation model was built by MIDAS GTS to analyze the slope stress distribution and slope-top building displacement features under different excavation depth. The analysis results show that the slope safety coefficient remains stable along with the increase of the distance between the buildings and slope top, however the range of potential sliding body reduces. On the other hand, with the enlargement of the distance, although the building displacement gradually reduced, but the differential displacement of the front and back of the building would be more serious, which is unfavorable for building cracking resistance.