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A platform for research: civil engineering, architecture and urbanism
Method for detecting bearing capacity of karst roadbed top plate by adopting prestress
The invention relates to a method for detecting the bearing capacity of a karst roadbed top plate by adopting prestress. The method for detecting the bearing capacity of the karst roadbed top plate byadopting prestress is carried out in accordance with the following steps that stress analysis on the karst roadbed top plate is carried out, a maximum bending moment design value M and a maximumshearing force design value Q are obtained according to the stress distribution condition of the karst roadbed top plate; a simplified mechanical model which consists of uniformly distributed loads and concentrated loads is constructed, a prestressed concentrated load value is solved; anchoring length, anchor rod material and anchor rod diameter parameters are determined according to the prestress load value; drilling a hole in the middle of the karst cave is carried out, inserting an anchor rod is carried out, grouting and anchoring are carried out, a concrete base and a steel plate arearranged as bearing plates; and concentrated loads are applied through using prestress tensioning equipment, stress changes are monitored after locking, the conditions of surrounding bedrock and soilbody are observed, and the bearing capacity of the karst top plate is judged. The method for detecting the bearing capacity of the karst roadbed top plate by adopting prestress can visually and effectively judge whether the karst roadbed top plate meets the roadbed design load requirement or not and whether the corresponding reinforcement treatment is needed to be carried out or not.
本发明涉及一种采用预加应力检测岩溶区路基顶板承载能力的方法，按以下步骤进行：对岩溶路基的顶板进行受力分析，根据岩溶路基顶板的受力分布情况，得到最大弯矩设计值M和最大剪力设计值Q；构建由均布荷载和集中荷载组成的简化力学模型，求取施加预应力集中荷载值；根据预应力荷载值确定锚固长度、锚杆材料和锚杆直径参数；在溶洞中部钻孔，插入锚杆并注浆锚固，设置混凝土底座和钢板作为承载板；利用预应力张拉设备施加集中荷载，锁定后监测应力变化并观察周边基岩和土体的状况，判定岩溶顶板的承载能力。本方法可以直观、有效地判定岩溶路基顶板是否满足路基设计荷载要求，是否需要进行相应的加固处理。
Method for detecting bearing capacity of karst roadbed top plate by adopting prestress
The invention relates to a method for detecting the bearing capacity of a karst roadbed top plate by adopting prestress. The method for detecting the bearing capacity of the karst roadbed top plate byadopting prestress is carried out in accordance with the following steps that stress analysis on the karst roadbed top plate is carried out, a maximum bending moment design value M and a maximumshearing force design value Q are obtained according to the stress distribution condition of the karst roadbed top plate; a simplified mechanical model which consists of uniformly distributed loads and concentrated loads is constructed, a prestressed concentrated load value is solved; anchoring length, anchor rod material and anchor rod diameter parameters are determined according to the prestress load value; drilling a hole in the middle of the karst cave is carried out, inserting an anchor rod is carried out, grouting and anchoring are carried out, a concrete base and a steel plate arearranged as bearing plates; and concentrated loads are applied through using prestress tensioning equipment, stress changes are monitored after locking, the conditions of surrounding bedrock and soilbody are observed, and the bearing capacity of the karst top plate is judged. The method for detecting the bearing capacity of the karst roadbed top plate by adopting prestress can visually and effectively judge whether the karst roadbed top plate meets the roadbed design load requirement or not and whether the corresponding reinforcement treatment is needed to be carried out or not.
本发明涉及一种采用预加应力检测岩溶区路基顶板承载能力的方法，按以下步骤进行：对岩溶路基的顶板进行受力分析，根据岩溶路基顶板的受力分布情况，得到最大弯矩设计值M和最大剪力设计值Q；构建由均布荷载和集中荷载组成的简化力学模型，求取施加预应力集中荷载值；根据预应力荷载值确定锚固长度、锚杆材料和锚杆直径参数；在溶洞中部钻孔，插入锚杆并注浆锚固，设置混凝土底座和钢板作为承载板；利用预应力张拉设备施加集中荷载，锁定后监测应力变化并观察周边基岩和土体的状况，判定岩溶顶板的承载能力。本方法可以直观、有效地判定岩溶路基顶板是否满足路基设计荷载要求，是否需要进行相应的加固处理。
Method for detecting bearing capacity of karst roadbed top plate by adopting prestress
一种预加应力检测岩溶路基顶板承载能力的方法
LIU XINQUAN (author) / DONG JIAN (author) / CHEN LEI (author) / REN YA (author) / ZHANG MING (author) / CHENG YUSHI (author) / LUO HUASONG (author) / ZONG JINDONG (author) / ZHANG XU (author)
2020-04-24
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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