青石梁结构体稳定性计算及其综合治理措施

Stabilty computation on a structural rock mass of Qingshiliang ridge

青石梁结构体位于某电站右岸坝前,其稳定性直接影响下部进水口施工与运行安全。本文在查明该结构体及其外围地质条件的基础上,采用刚体极限平衡法对其进行了稳定性计算,计算结果表明,该结构体在地震作用的特殊荷载组合工况下,其整体抗滑稳定性偏低,必须对其进行工程处理。据此本文采取了锚索、锚筋桩及系统锚杆、混凝土护坡等深层、表层相结合的加固措施,即选用锚索加固结构体整体稳定性,同时又针对结构体表部倾倒-滑移型局部失稳破坏模式,采用锚杆、混凝土贴坡等进行边坡表层加固,并在此基础上,于结构体及其外围布置了监测系统。经计算,加固后的结构体稳定性满足设计要求。

A structural rock mass is developed at the underpart of Qingshiliang ridge which stands at right bank of upstream of dam. Stability of the structural rock mass directly affects safety of construction and run of hydropower station infall. Based on engineering geological conditions of structural rock mass and its periphery, the paper takes measure of limit equilibrium to compute the stability of the rock mass.Computed value indicates that stability against sliding is on the low side under conditions of special load combination of earthquake and deadweight, so measures must be taken to reinforce the structural rock mass. Some deep and superficial reinforcement measures such as anchorage, anchor, anchor rod pile and concrete clung to the slope, and so on, are considered to strengthen stability of structural rock mass, of which anchorage is to improve monolithic stability and anchor, concrete clung to the slope to local stability according to superficial slope falling-sliding failure mode. Finally, monitoring system is set on the surface of structural rock mass and its periphery slope. Stability of reinforced structural rock mass can meet design demand by computing.