复杂填方高边坡工程支护体系设计优化与研究

Design optimization and research on support system ofcomplex fill high slope engineering

复杂填方高边坡在稳定性方面存较多不利因素,设计时应根据其具体情况,因地制宜,对不同的支护方案进行对比分析,优化支护设计,才能得到最佳工程效果。以湖南省某矿山1#边坡工程为例,针对岩溶地区填方高边坡的复杂情况,提出上部锚杆格构梁+下部桩锚支护与上部桩锚支护+下部重力式挡土墙两种支护方案,采用理正软件与FLAC3D数值模拟软件进行建模计算与分析,并从施工可行性、安全性与经济性等方面,对两个方案进行对比,结果表明:①理正软件和数值模拟的计算结果与边坡竣工后的监测数据基本吻合,验证了计算模型与分析方法的合理性。②上部桩锚支护+下部重力式挡土墙的支护方案安全系数较高,受力模式更加合理,施工的安全可靠性更高,并节省了施工工期与工程造价,同时具有较好的绿化景观效果。③通过边坡竣工后的沉降与位移长期监测,该边坡工程稳定性良好。④通过对复杂高填方边坡的不同支护方案进行对比研究,得到了最优方案,对以后类似工程的设计和施工具有较好的指导与借鉴意义。

There are many disadvantageous factors in the stability of complex fill high slope.The design should be based on its specific condition and local condition.Different support schemes should be compared and analyzed,and the support design can be optimized to obtain the best engineering effect.The slope engineering of a mine in Hunan Province is taken as an example,aiming at the complex situation of filling high slope in karst area,two supporting schemes are put forward,i.e.the upper bolt lattice beam+the lower pile anchor support and the upper pile anchor support+the lower gravity retaining wall.The two supporting schemes are modeled,calculated and analyzed by the Lizheng software and FLAC3D numerical simulation software,and the two schemes are analyzed from the aspects of construction feasibility,safety and economy.The result is shown as follows.(1)The calculation results of the Lizheng software and numerical simulation software are basically consistent with the monitoring data after the completion of the slope,it is verified for the rationality of the calculation model and analysis method.(2)The support scheme of the upper pile anchor support+the lower gravity retaining wall has higher safety coefficient,more reasonable stress mode,higher safety and reliability of construction,saves construction period and project cost,and has better greening landscape effect.(3)Through the long-term monitoring of settlement and displacement after the completion of the slope,the stability of the slope project is good.(4)Through the comparative study of different supporting schemes of complex fill high slope,the optimal scheme is obtained.There is a good guidance and reference significance for the design and construction of similar projects in the future.