论文部分内容阅读
为探明涵周土特性对高填方涵洞涵顶土压力及沉降特性的影响,基于数值仿真模拟,分析了不同涵顶填土模量、涵侧填土模量、地基土模量等因素对高填方不同结构型式涵洞涵顶土压力及其变形特性的影响,并结合计算结果提出相关的工程技术建议。研究结果表明:(1)随着涵填土模量E与涵侧填土模量Et的增大,涵顶垂直土压力σz、涵顶垂直土压力集中系数Ks及涵顶内外土体沉降差δ均呈现逐渐减小趋势,且涵侧填土模量Et较涵顶填土模量E影响更大;当涵侧填土模量大于涵顶填土模量的2倍时,Ks值可比二者相等时平均降低15%左右;(2)σz和Ks值随着地基土模量Ed的增大而增大,说明并非地基强度越大对高填方涵洞结构受力越有利,因此,当地基土质较差不能满足地基承载力要求而需采用地基处理时,应注意增大地基土模量对涵洞结构带来的不利影响;(3)涵洞结构断面不同,涵顶填土的沉降变形及垂直土压力σz变化规律也不同,在高填方涵洞设计中,应掌握不同断面型式涵洞各位置处的受力变形情况以及最不利点位置,合理选择涵洞断面结构型式。
In order to find out the effect of surrounding soil characteristics on culvert pressure and settlement characteristics of culvert culvert in high embankment, based on numerical simulation, factors such as fill modulus of culvert, culvert modulus of culvert and modulus of foundation soil The influence of high fill and different deformation of culvert culvert culvert on the earth pressure and deformation characteristics are proposed. Relevant engineering suggestions are put forward based on the calculation results. The results show that: (1) With the increase of the modulus E of the culvert fill and the fill modulus of the culvert Et, the vertical earth pressure σz at the culvert, the vertical earth pressure concentration coefficient Ks at the culvert and the settlement difference between the soil inside and outside the culvert δ showed a trend of decreasing gradually, and the soil-filling modulus Et had a greater effect on the filling modulus E of the culvert than the culvert filling modulus. When the culvert-side filling modulus was more than twice of the filling modulus of the culvert, the Ks value was comparable (2) The values of σz and Ks increase with the increase of the modulus of foundation soil Ed, which shows that the greater the strength of the foundation, the more favorable the force is to the culvert structure of high fill. Therefore, When the foundation soil with poor quality can not meet the requirements of the foundation bearing capacity and need to be treated with foundation, attention should be paid to increase the adverse effect of the modulus of foundation soil on the culvert structure; (3) Different sections of the culvert structure, settlement deformation of the culvert fill And the variation law of vertical earth pressure σz are also different. In the design of high fill culverts, the stress and deformation conditions and the most unfavorable point positions at different positions of culverts should be grasped, and the structure type of culverts should be selected reasonably.