Evaluation of strength distribution at cut slope of decomposed granite with use of sounding method and geophysical exploration method
Evaluation of strength distribution at cut slope of decomposed granite with use of sounding method and geophysical exploration method
复制标题
测深法和物探法评价风化花岗岩切坡强度分布
DOI：
10.1007/s10333-019-00722-5
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Ueta;T.;Nishimura;S.;Imaide;K.;Shibata;T. and Shuku;T.
天然边坡和路堑边坡经常因暴雨和地震而坍塌，造成灾害。必须采取对策来减轻这类灾害。边坡表层崩塌的风险特别高，因此，详细评价表层的强度分布对减灾防灾具有重要意义。作为这些目的的简单调查方法，有测深法和地球物理勘探法。本文选择动力触探(DCP)作为测深方法，选择面波法(SWM)作为物探方法。强度参数一般是基于标准贯入试验(SPTS)来假定的，但DCP试验比SPTS简单，可以应用于狭窄的空间。另一方面，SWM可以在短时间内调查大范围的空间。我们开发了物探方法和测深方法的综合方法。从SWM和DCP试验获得的两个结果--分别是剪切速度和DCP击数--需要转换为标准渗透试验击数才能合成。综合两种方法的结果，采用地质统计学方法中的指示器模拟方法来模拟N值的随机场。将该方法应用于某风化花岗岩路堑边坡软弱表层强度的评价，验证了该方法的实用性。
Natural slopes and cut slopes frequently collapse due to heavy rain and earthquakes, causing disasters. Countermeasures must be applied to mitigate such disasters. There is an especially high risk of a collapse at the surface layer of slopes, and thus, evaluating the strength distribution in the surface layer in detail is important to mitigating and preventing disasters. As simple investigation methods for these purposes, there are sounding methods and geophysical exploration methods. In the present study, dynamic cone penetration (DCP) is selected as the sounding method, and the surface wave method (SWM) is selected as the geophysical exploration method. The strength parameters are generally assumed based on standard penetration tests (SPTs), but DCP tests are simpler than SPTs and can be applied to narrow spaces. On the other hand, the SWM can be used to investigate wide spaces in a short time. We developed a synthesized approach to the geophysical exploration method and the sounding method. The two results obtained from the SWM and the DCP tests—namely the shear velocity and the DCP blow count, respectively—need to be converted to the standard penetration test blow count in order to be synthesized. An indicator simulation, one of the geostatistical methods, is employed to simulate the random field ofNvalues by synthesizing the two results. The proposed procedure is applied to evaluate the strength of the weak surface layer of a cut slope composed of weathered granite, and its applicability for practical use is verified.