深基坑放坡-桩锚联合支护结构的监测及数值模拟  

Numerical Simulation and Monitoring of Slope-Pile Anchor Combined Support Structure for Deep Excavation

作　　者：解磊[1] 董礼[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第2期228-235,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(10902073);住房和城乡建设部研究开发项目(K32015001)

摘　　要：目的研究放坡-桩锚支护结构变形的演化规律及力学性能.方法以沈阳地区某深基坑为例,分析放坡-桩锚支护结构变形和锚杆轴力的分布情况,采用FLAC3D软件对深基坑放坡-桩锚联合支护结构进行数值模拟,并对现场监测结果进行分析.结果土体摩尔-库伦模型可以很好地描述土体的力学特征.结论基坑四边的中点处发生水平位移最大,角点处最小;支护桩桩顶水平位移最大;地表最大沉降发生在坡顶开挖边线的位置,且水平影响范围在距基坑边缘处15 m.锚杆内力在锚杆的自由段不变,在锚固段随锚固段的增长而变小.The deformation evolutional law and mechanical behavior of slope-pile anchor combined support structure were studied. Taking a deep foundation pit in Shenyang for example, deformation distributions of slope-pile anchor combined support structure and axial force of anchor bolt were analyzed. Slope-pile anchor combined support structure for deep foundation pit was simulated using FLAC3D software. Results of site monitoring were analyzed. It is found that the proposed MohrColumb model can well describe the mechanical characteristics of soil. Conclusion is that the maximum horizontal displacement occurs at the midpoint quadrilateral of foundation pit. The minimum horizontal displacement is at the comer;the maximum horizontal displacement occurs at the top of the supporting pile;the maximum surface settlement is at top of the excavating sideline position; and the horizontal influence scope is 15 meters away from the foundation pit edge. In free segment of anchor, the force is constant;but the force decreases with increase of the anchoring section.

关 键 词：放坡-桩锚联合支护结构变形 FLAC3D数值模拟 锚杆轴力 深基坑 沈阳地区 

分 类 号：TU441.6[建筑科学—岩土工程]