2018年乌鲁木齐Ms4.8级地震发震构造及房屋震害特点分析

SEISMOGENIC STRUCTURE AND SEISMIC DISASTER CHARACTERISTICS OF BUILDINGS AFTER WULUMUQI Ms 4.8 EARTHQUAKE IN 2018

2018年1月20日,新疆乌鲁木齐市发生Ms4. 8级地震,震中位于乌鲁木齐市南部的柴窝堡盆地内,最大烈度为Ⅴ度。震区房屋主要是中老旧、自建土木(砖木)和砖混结构房屋,因多数为未经正规设计,地基处理不规范,没有进行过抗震设防的自建房,在此次地震中出现不同程度破坏,部分房屋墙体出现细小裂缝、横纵向连接处竖向裂缝等;砖混结构房屋因建造年代久远,施工质量差,出现了横纵墙连接处的轻微裂缝、门洞贯通性斜向裂缝、窗户洞周围墙皮被挤、墙体竖向裂缝等。富民安居房屋抗震措施满足设防要求,抗震性能良好,在本次地震中基本完好,经受住了地震考验。根据现场调查结果,本次地震位于柴窝堡南缘断裂附近,可能为该断裂最新活动的结果。

On January 20,2018,Ms4.8 earthquake occurred in Urumqi County in Xinjiang. The earthquake occurred in the Chaiwopu Basin in the southern part of Urumqi. The seismic intensity is V degree. The houses in the earthquake -stricken areas are mainly old, self- built civil -structure, brick -and -wood and brick - concrete structures. Most of them are self - built houses that have not been properly designed, have not ground treatment, and have not been subjected to seismic fortification. After this earthquake, there were damaged in different degrees, some small cracks appeared in the wall of the houses, vertical cracks in the horizontal and vertical joints, etc. ; the brick - concrete structure houses were old and the construction quality was poor, and slight cracks appeared at the joints of the horizontal and vertical walls. There are penetrating oblique cracks in the door opening, wall skin around the window hole being squeezed, and vertical cracks in the wall. The anti - seismic measures for houses in the comfortable housing project meet the fortification requirements, and the seismic perforeance is good. In this earthquake, the comfortable houses were basically intact, and the comfort- able housing project withstood the test in the earthquake. According to the results of the on - site investigation, the earthquake is located near the southern margin of Chaiwopu, which may be the result of the latest activity of the fault.