民用高层建筑深基坑边坡支护措施力学分析  

MECHANICAL ANALYSIS OF SLOPE SUPPORT MEASURES FOR DEEP FOUNDATION PIT OF CIVIL HIGH-RISE BUILDINGS

作　　者：李翔龙 Li Xiang-long

机构地区：[1]中建二局第三建筑工程有限公司,北京100070

出　　处：《建筑技术开发》2022年第3期103-108,共6页Building Technology Development

摘　　要：以某工程为依托,研究了3种工况下深基坑边坡支护措施力学变化规律,即5排土钉+2排预应力锚杆、4排土钉+2排预应力锚杆、4排土钉+1排预应力锚杆。采用有限元软件Midas-GTS NX建立3种工况下深基坑支护力学模型,对比分析了不同工况下边坡支护措施内力、位移变化,支护结构力学变化等。研究结果表明:工况1塑性最大值相比工况2降低19.61%,相比工况3降低32.79%;预应力锚杆轴向拉力相比工况2增加值更大,比工况3最大增加3.57%;竖向沉降值在3种工况下最小,同时水平位移值更快趋于稳定。结合现场深基坑边坡支护方案,工况1有效降低边坡土层变形,提高边坡坡面稳定性。将建模理论计算值与施工现场检测数据进行对比分析,验证了该方法的正确性。Based on a project,the mechanical change law of deep foundation pit slope support measures under three working conditions is studied,namely,5 rows of soil nails and 2 rows of prestressed anchor bolts,4 rows of soil nails and 2 rows of prestressed anchor bolts,4 rows of soil nails and 1 row of prestressed anchor bolts.The mechanical model of deep foundation pit support under three working conditions is established by using the finite element software MIDAS-GTS NX.The changes of internal force and displacement of slope support measures and the mechanical changes of support structure under different working conditions are compared and analyzed.The results show that the maximum plastic value of working condition 1 is 19.61% lower than that of working condition 2 and 32.79%lower than that of working condition 3;compared with condition 2,the axial tension of prestressed anchor rod of working condition 1 increases more,with a maximum increase of 3.57% compared with condition 3;the vertical settlement value is the smallest under the three working conditions,and the horizontal displacement value tends to be stable faster.Combined with the on-site deep foundation pit slope support scheme,work condition 1 can effectively reduce the deformation of slope soil layer and improve the stability of slope surface.The correctness of this method is verified by comparing the calculated value of modeling theory with the detection data of construction site.

关 键 词：民用高层建筑 深基坑 边坡支护 力学分析 

分 类 号：TU758.11[建筑科学—建筑技术科学]