京沪高速公路改扩建层状构造岩质高边坡倾倒型破坏类型分析

以京沪高速公路改扩建工程莱芜至临沂段岩质高边坡为例,对其倾倒型破坏类型进行分析,本文通过直观分析和实际调研,得出了岩质边坡特征和致灾机理,以沿线三处边坡为例进行分析认为:(1) K551+714~552+115左幅边坡发育有一组反倾结构面,边坡稳定性较差,容易发生倾倒破坏;(2) K565+914~566+587左幅边坡属反倾结构面,存在多条节理裂隙切割层面边坡稳定,滑动的可能性小,局部可能出现落石、崩塌等现象;(3) K593+260~593+555右幅边坡为顺倾结构面,岩体风化不均,局部节理裂隙发育。局部可能出现掉块、崩塌等现象。

Analysis of Toppling Failure Types of Stratified High rock Slopes in Reconstruction and Extension of Beijing-Shanghai Expressway

Taking the high rock slope of the Laiwu-Linyi section of the Beijing-Shanghai Expressway reconstruction and expansion project as an example,the types of dumping damage are analyzed.Through intuitive analysis and actual investigation,the characteristics and disasters of the rock slope are obtained.The mechanism is analyzed by taking three slopes along the line as an example:(1)K551+714~552+115 left side slope has a set of anti-dipping structural planes,the slope stability is poor,and it is prone to toppling damage;(2)The left side slope of K565+914~566+587 is an anti-dipping structural plane,and there are multiple joints,fissures and cutting planes.The slope is stable,the possibility of sliding is small,and local phenomena such as rock falling and collapse may occur;(3)K593+260 The right side slope of~593+555 is a downdipping structural plane,with uneven weathering of the rock mass and development of local joints and fissures.Loss of blocks and collapse may occur locally.